Mackie Srm1801 Users Manual

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OWNER’S MANUAL

18” Powered Subwoofer

SRM1801

2

1. Read these instructions.

2. Keep these instructions.

3. Heed all warnings.

4. Follow all instructions.

5. Do not use this apparatus near water.

6. Clean only with a dry cloth.

7. Do not block any ventilation openings. Install in accordance with the

manufacturer’s instructions.

8. Do not install near any heat sources such as radiators, heat registers,

stoves, or other apparatus (including amplifiers) that produce heat.

9. Do not defeat the safety purpose of the polarized or grounding-type

plug. A polarized plug has two blades with one wider than the other.

A grounding-type plug has two blades and a third grounding prong.

The wide blade or the third prong are provided for your safety. If the

provided plug does not fit into your outlet, consult an electrician for

replacement of the obsolete outlet.

10.

Protect the power cord from being walked on or pinched particularly at

plugs, convenience receptacles, and the point where they exit from the

apparatus.

11.

Only use attachments/accessories specified by the manufacturer.

12.

Use only with a cart, stand, tripod, bracket, or

table specified by the manufacturer, or sold with

the apparatus. When a cart is used, use caution

when moving the cart/apparatus combination to

avoid injury from tip-over.

13.

Unplug this apparatus during lightning storms or

when unused for long periods of time.

14.

Refer all servicing to qualified service personnel. Servicing is required

when the apparatus has been damaged in any way, such as power-

supply cord or plug is damaged, liquid has been spilled or objects have

fallen into the apparatus, the apparatus has been exposed to rain or

moisture, does not operate normally, or has been dropped.

15.

This apparatus shall not be exposed to dripping or splashing, and no

object filled with liquids, such as vases or beer glasses, shall be placed

on the apparatus.

16.

Do not overload wall outlets and extension cords as this can result in a

risk of fire or electric shock.

17.

This apparatus has been designed with Class-I construction and must

be connected to a mains socket outlet with a protective earthing con-

nection (the third grounding prong).

18.

This apparatus has been equipped with a rocker-style AC mains power

switch. This switch is located on the rear panel and should remain

readily accessible to the user.

19.

The MAINS plug or an appliance coupler is used as the disconnect

device, so the disconnect device shall remain readily operable.

20. NOTE: This equipment has been tested and found to comply with

the limits for a Class B digital device, pursuant to part 15 of the FCC

Rules. These limits are designed to provide reasonable protection

against harmful interference in a residential installation. This equip-

ment generates, uses, and can radiate radio frequency energy and, if

not installed and used in accordance with the instructions, may cause

harmful interference to radio communications. However, there is no

guarantee that interference will not occur in a particular installation. If

this equipment does cause harmful interference to radio or television

reception, which can be determined by turning the equipment off and

on, the user is encouraged to try to correct the interference by one or

more of the following measures:

• Reorientorrelocatethereceivingantenna.

• Increasetheseparationbetweentheequipmentandthereceiver.

• Connecttheequipmentintoanoutletonacircuitdifferentfrom

that to which the receiver is connected.

• Consultthedealeroranexperiencedradio/TVtechnicianforhelp.

CAUTION: Changes or modifications to this device not expressly

approved by LOUD Technologies Inc. could void the user's authority to

operate the equipment under FCC rules.

21.

This apparatus does not exceed the Class A/Class B (whichever is

applicable)

limits for radio noise emissions from digital apparatus as

set out in the radio interference regulations of the Canadian Department

of Communications.

ATTENTION — Le présent appareil numérique n’émet pas de bruits

radioélectriques dépassant las limites applicables aux appareils

numériques de class A/de class B (selon le cas) prescrites dans le

réglement sur le brouillage radioélectrique édicté par les ministere des

communications du Canada.

22.

Exposure to extremely high noise levels may cause permanent hearing

loss. Individuals vary considerably in susceptibility to noise-induced

hearing loss, but nearly everyone will lose some hearing if exposed to

sufficiently intense noise for a period of time. The U.S. Government’s

Occupational Safety and Health Administration (OSHA) has specified

the permissible noise level exposures shown in the following chart.

According to OSHA, any exposure in excess of these permissible limits

could result in some hearing loss. To ensure against potentially danger-

ous exposure to high sound pressure levels, it is recommended that all

persons exposed to equipment capable of producing high sound pres-

sure levels use hearing protectors while the equipment is in operation.

Ear plugs or protectors in the ear canals or over the ears must be worn

when operating the equipment in order to prevent permanent hearing

loss if exposure is in excess of the limits set forth here:

Important Safety Instructions

PORTABLE CART

WARNING

CAUTION AVIS

RISK OF ELECTRIC SHOCK. DO NOT OPEN

RISQUE DE CHOC ELECTRIQUE. NE PAS OUVRIR

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER (OR BACK)

NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL

ATTENTION: POUR EVITER LES RISQUES DE CHOC ELECTRIQUE, NE PAS ENLEVER LE COUVERCLE.

AUCUN ENTRETIEN DE PIECES INTERIEURES PAR L'USAGER.

CONFIER L'ENTRETIEN AU PERSONNEL QUALIFIE.

AVIS: POUR EVITER LES RISQUES D'INCENDIE OU D'ELECTROCUTION, N'EXPOSEZ PA S CET ARTICLE

A LA PLUIE OU A L'HUMIDITE

The lightning flash with arrowhead symbol within an equilateral triangle is

intended to alert the user to the presence of uninsulated "dangerous

voltage" within the product's enclosure, that may be of sufficient magnitude

to constitute a risk of electric shock to persons.

Le symbole éclair avec point de flèche à l'intérieur d'un triangle équilatéral

est utilisé pour alerter l'utilisateur de la présence à l'intérieur du coffret de

"voltage dangereux" non isolé d'ampleur suffisante pour constituer un risque

d'éléctrocution.

The exclamation point within an equilateral triangle is intended to alert the

user of the presence of important operating and maintenance (servicing)

instructions in the literature accompanying the appliance.

Le point d'exclamation à l'intérieur d'un triangle équilatéral est employé

pour alerter les utilisateurs de la présence d'instructions importantes pour le

fonctionnement et l'entretien (service) dans le livret d'instruction

accompagnant l'appareil.

WARNING — To reduce the risk of fire or electric shock, do not

expose this apparatus to rain or moisture.

Duration,

per day in

hours

Sound Level

dBA, Slow

Response

Typical Example

8 90 Duo in small club

6 92

4 95 Subway Train

3 97

2 100 Veryloudclassicalmusic

1.5 102

1 105 Greg and Ben screaming at Troy

about deadlines

0.5 110

0.25 or less 115 Loudest parts at a rock concert

Part No. SW0842 Rev. B 10/10

©2010 LOUD Technologies Inc. All Rights Reserved.

3

What? Me read a manual?

Before you begin, please make sure you read the

Safety Instructions on page 2 and Getting Started

on page 4.

Your new Mackie SRM1801 powered subwoofers

are designed to set up quickly and operate easily.

We know it’s often seen as a sign of weakness to

read a manual, along with asking for directions

when lost, but we hope you will read the rest of the

manual, at least while nobody is looking.

It is important to keep your receipt in a

safe place, and not a bad idea to write your

product information below for future reference

(i.e., insurance claims, tech support, return

authorization, etc.).

Don’t forget to visit our website at www.mackie.com

for more information about this and other Mackie products.

Subwoofer 1 Subwoofer 2

Please write the serial number for your SRM1801 here

(or for both SRM1801’s if you have two) for future reference

(i.e., insurance claims, tech support, return authorization, etc.):

Purchased at:___________________________________ Date of Purchase:_____________

CONTENTS

SAFETY INSTRUCTIONS ........................................... 2

GETTING STARTED ................................................... 4

INTRODUCTION ...................................................... 5

HOOKUP DIAGRAMS............................................... 6

MACKIE SRM1801 FEATURES ................................. 8

1. IEC AC RECEPTACLE AND FUSE ..................... 8

2. POWER ..................................................... 8

3. INPUTS ...................................................... 9

4. FULL RANGE OUTPUTS ................................ 9

5. HIGH PASS OUTPUTS .................................. 9

6. POLARITY .................................................. 9

7. LEVEL ....................................................... 10

8. THERMAL LED ........................................... 10

9. OL LED ..................................................... 10

10. SIGNAL LED .............................................. 10

11. POWER LED .............................................. 10

INS AND OUTS OF POLARITY ................................. 11

PROTECTION CIRCUITS .......................................... 12

LIMITING .............................................................. 12

OVEREXCURSION PROTECTION ............................. 12

THERMAL PROTECTION ......................................... 12

PLACEMENT .......................................................... 12

CARE AND MAINTENANCE ..................................... 12

APPENDIX A: SERVICE INFORMATION .................... 13

APPENDIX B: CONNECTIONS ................................. 15

APPENDIX C: SRM1801 SPECIFICATIONS ............... 16

MACKIE LIMITED WARRANTY ................................ 18

4

Getting Started

The following steps will help you set up your

subwoofer(s) quickly.

INITIAL SETTINGS:

1. Turn the LEVEL control on the rear panel all the

way down.

2. Turn the POWER switch OFF.

CONNECTIONS:

1. Connect the line-level signal from a mixer (or other

signal source) to the INPUT jack on the SRM1801

rear panel (XLR connector). If you are operating the

system in stereo, connect INPUT B, as well.

2. Connect the supplied AC power cord to the IEC

socket on the back of the subwoofer. Plug the other

end into an AC outlet properly configured with the

correct voltage as indicated just above the IEC

socket.

TURN IT ON:

1. Turn the POWER switch ON.

2. Start your signal source (mp3 player, CD, DAW,

band, or whatever), but leave the master level

control on your mixer down.

3. Slowly turn up the LEVEL control on the SRM1801

to the “U” (unity gain) mark at the center position.

4. Adjust the master volume on your mixer to a

comfortably loud listening level. If the volume from

the subwoofer gets really loud, really fast, try turning

down the LEVEL control on the SRM1801 a bit. If

the subwoofers don’t get loud enough, turn up the

LEVEL control to achieve a good balance of master

volume control and loudness from the subwoofer.

Now that you have your subwoofers working, it’s time

to hunker down and read the rest of this manual…

especially the following:

ADDITIONAL TIDBITS OF WIDSDOM:

• Neverlistentoloudmusicforprolongedperiods.

Please see the Safety Instructions on page 2 for

information on hearing protection.

• Whenyoushutdownyourequipment,turnoffthe

SRM1801 subwoofers first to prevent thumps

and other noises generated by any upstream

equipment from coming out the speakers. When

powering up, turn on the SRM1801 last, but just

before your full-range loudspeakers.

• Savetheshippingboxesandpackingmaterials!

You may need them someday. Besides, your

cat will love playing in them and jumping out at

you unexpectedly. Remember to pretend like you

  aresurprised!

• Saveyoursalesreceiptinasafeplace.

• Recordtheserialnumberinthespaceprovidedon

page 3, along with where and when you bought it.

FU SE: T 10 AH AC 25 0V

RE V I S I O N

SE R I A L N U M B E R

WARNING:

TO REDUCE THE RISK OF FIRE OR ELECTRIC

SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR

MOISTURE. DO NOT REMOVE COVER. NO USER SERVICEABLE

PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.

AVIS:

RISQUE DE CHOC ELECTRIQUE — NE PAS OUVRIR

POW ER

ON

BA

INPUTS

B

A

B

A

OUTPUTS

HIG H P ASS

FUL L R ANG E

LEVEL

OL SIG NAL P OWE R

POLARITY

NORMAL

INVERT

THE RMA L

+6dB 6dB

-

18-INCH POWERED SOUND REINFORCEMENT SUBWOOFER

5

Introduction

Thank you for choosing the Mackie SRM1801 subwoofer. Mackie’s SRM Series powered loudspeakers achieve the

perfect balance of power, portability, and sound quality. Designed by the same team that produced the best-selling

Mackie SRM450v2, the SRM1801 delivers real power in a design that is extremely lightweight and portable. The

SRM1801 incorporates Mackie-standard professional components like efficient Class-D Fast Recovery™ amplifiers

and system-optimizing Active electronics so that everything sounds great right out of the box.

The SRM1801 all-wood enclosure has a ported bass reflex design that produces tight low end. And the

lightweight, ultra-efficient Class-D Fast Recovery™ power amplifier delivers 1000W peak power with less risk of

thermal overload. This makes the sub extremely lightweight and portable without compromising the power and

performance that you deserve. Pair this power with our proven built-in Active electronics, including a precision

crossover and tuning filters, and you get professional low end that you can feel...custom tuned to be tight and

punchy.

Pair the SRM1801 with the best-selling SRM450v2 and you have a complete (and completely affordable) “plug

and play” system that is ideal for small clubs, DJs and rehearsal spaces. The SRM1801 has both full-range and

high-pass stereo outputs for connection to full-range top boxes. Just dial in the appropriate level and use the

polarity switch to make sure the sub is in phase with the loudspeakers. The integrated pole-cup can accommodate

a standard mounting pole, so your favorite speaker has a nice place to sit. Or you can just stack your full-range box

right on top of the sub...the SRM1801 ain’t picky.

So if you are looking for an extremely powerful, professional and great sounding PA setup that is simple to use

and easy on the wallet, then you’re in the right place.

Here are a few of the key features of your new Mackie SRM1801:

• 1000Wofultra-efcientClass-DFastRecovery™ amplification

• MackieActiveelectronicsprovidetotalsystemoptimization

  • Precisioncrossover(125Hz)

  • Tuningltersforaccuratebassresponse

• 18-inchwooferdeliverssuperioroutputandlow-frequencyextension

• DualXLRinputsformonoorstereoapplications

• Stereohigh-passandfull-rangeoutputs

• User-adjustablelevelandpolaritycontrols

• Individualpower,signal,OL,andthermalprotectindicators

• Polereceptacleformountingfull-rangeloudspeakers

• Solidplywoodenclosurewithhighdurability,texturedblackpaint

• Extremelylightweightandportable(73lbs/33.1kg)

Read on to learn everything you could possibly want to know about your new subwoofer.

6

Main PA System with two subwoofers and two powered loudspeakers

1234

Right Main

Powered Loudspeaker

(Mackie SRM450v2 shown)

Left Main

Powered Loudspeaker

(Mackie SRM450v2 shown)

Pole Mount

High Pass

Output Pole Mount

High Pass

Output

From Mixer

Left Output

From Mixer

Right Output

Mixing Console

(Mackie CFX12mkII shown)

The left and right line-level outputs from a mixer feed the inputs of the Mackie SRM1801 powered

subwoofers. The high pass line-level outputs of the subwoofers feed the inputs of the Mackie SRM450v2

powered loudspeakers, so these reproduce the mid-to-high frequencies in stereo, and the subs provide

the low frequencies in stereo.

Left and Right Main

Powered Loudspeakers

(Mackie SRM450v2 shown)

From Mixer

Left and Right

Outputs

High Pass

Output

Mixing Console

(Mackie ProFX12 shown)

MONMAIN

43215/6 7/89/1011/12

Main PA System with one subwoofer and two powered loudspeakers

The left and right line-level outputs from a mixer feed the inputs of the Mackie SRM1801 powered

subwoofer. The high pass line-level outputs of the subwoofer feed the inputs of the Mackie SRM450v2

powered loudspeakers, so these reproduce the mid-to-high frequencies in stereo, and the sub provides

the low frequencies in mono.

Hookup Diagrams

7

Daisy-chaining two subwoofers

From Mixer

Output

SRM1801

Subwoofer 1

Full-Range

Output

SRM1801

Subwoofer 2

Mixing Console

(Mackie 1604-VLZ3 shown)

From Mixer

Right Output

From Mixer

Left Output

SRM1801 Right

Subwoofer 1

SRM1801 Right

Subwoofer 2

SRM1801 Left

Subwoofer 1

SRM1801 Left

Subwoofer 2

Right Main

Powered

Loudspeaker

(Mackie SRM450v2

shown)

Left Main

Powered

Loudspeaker

(Mackie SRM450v2

shown)

Mixing Console

(Mackie Onyx 1640i shown)

High-Pass

Outputs

Full-Range

Outputs

Straps Straps

A lot of low-end

The left and right line-level outputs from a mixer feed the left and right inputs of the first Mackie

SRM1801 powered subwoofer. The inputs are summed in mono to play in the subwoofer, but this does

not affect the full-range or high-pass outputs, which remain fully stereo. The left and right full-range line-

level outputs of this subwoofer feed the left and right inputs of the second Mackie SRM1801 powered

subwoofer. The high-pass outputs or full-range outputs of either subwoofer could feed the other powered

loudspeakers in your system.

The left and right line-level outputs from a mixer feed the inputs of a pair of Mackie SRM1801 powered

subwoofers. Their respective full-range outputs feed the inputs of another pair of Mackie SRM1801

powered subwoofers. The high-pass outputs from the second set of subwoofers then feed the inputs of a

pair of Mackie SRM450v2 powered loudspeakers.

NOTE: It is highly recommended that you use straps to secure your loudspeakers for stacked scenarios

such as this one. Be sure to loop a strap through each handle going down each side of the cabinet setup,

as shown above.

8

Mackie SRM1801 Features

2. POWER

Press up on this switch to turn the SRM1801

subwoofer on. The power LED [11] above the LEVEL

knob[7]illuminateswhenthePOWERswitchisonand

AC power is available at the linecord socket.

Press the bottom of this switch to put the subwoofer

into standby mode. It will not function, but the circuits

are still live. To remove AC power, either turn off the

AC mains supply, or unplug the power cord from the

subwoofer and the AC mains supply.

As a general guide, powered

subwoofers should be turned on after

the mixer and other sources, but prior

to full-range speakers. Additionally, they

should also be powered off after the tops,

but before the mixer and other sources. This will reduce

the possibility of any turn-on, or turn-off thumps in your

speakers.

The rear panel is where you connect AC power

and your signals to and from the subwoofer. You may

also adjust the level and polarity to match the other

loudspeakers in your system and account for the

subwoofer’s location and your room’s environment.

1. IEC AC Receptacle and Fuse

Connect the detachable line cord to this IEC socket

securely, and plug the other end into an AC outlet.

Make sure the AC power is matched to the AC power

indicated on the rear panel above the IEC socket.

The fuse is located behind the fuse cover, at the

bottom of the IEC socket. See the “Troubleshooting”

section on page 13 for information about replacing the

fuse.

Always turn off the power and disconnect

the power cord before inspecting or

changing the fuse. Always replace the fuse

with the exact same type and rating as the

original fuse.

RE VI S IO N

SE RI AL N UM B ER

WARNING:

TO REDUCE THE RISK OF FIRE OR ELECTRIC

SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR

MOISTURE. DO NOT REMOVE COVER. NO USER SERVICEABLE

PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.

AVIS:

RISQUE DE CHOC ELECTRIQUE — NE PAS OUVRIR

POW ER

ON

BA

INPUTS

B

A

B

A

OUTPUTS

HIG H PAS S

FUL L RAN GE

LEVEL

OL S IGNA L POW ER

POLARITY

NORMAL

INVERT

THE RMAL

+6dB 6d B

-

18-INCH POWERED SOUND REINFORCEMENT SUBWOOFER

118

7

6

5

4

3

9 10

2 1

9

3. INPUTS

Balanced XLR female connectors are provided for the

left and right inputs. Connect the full-range line-level

signal from the mixer or other signal source to these

input jacks.

If you are connecting a single subwoofer output, or

LFE (low-frequency effects) output to the subwoofer,

you may use either the A or B input connector.

CAUTION: NEVER connect the output of

an amplifier directly to the input of the

subwoofer. This could damage the input

circuitry of the active subwoofer.

4. FULL RANGE OUTPUTS

Balanced XLR male connectors are provided for the

line-level A and B full-range outputs. Connect these

outputs to the inputs of another powered subwoofer,

main powered loudspeakers, or to an amplifier powering

passive loudspeakers.

The signal at these outputs is a direct copy of the

input signals. These outputs allow you to daisy-chain

multiple subwoofers, and/or send the full-range signals

to the main loudspeakers.

The level control and polarity switch have no effect

on the full-range outputs. The outputs are separate and

maintain the stereo separation of the input signals.

5. HIGH PASS OUTPUTS

Balanced XLR male connectors are provided for the

line-level A and B high-pass outputs. The subwoofer’s

internal active crossover splits the input signals into

two frequency bands. The low frequency range below

125 Hz goes to the internal amplifier that powers the

subwoofer. The frequency range above 125 Hz is sent to

these line-level output jacks.

Connect these outputs to the inputs of your main

powered loudspeakers, or to the inputs of the amplifier

powering the main loudspeakers. In this way, the main

loudspeakers will play the range above 125 Hz. If the

main loudspeakers have good low-frequency response,

then you may decide to use the full-range outputs [4]

instead.

The level control and polarity switch have no effect

on the high-pass outputs. The outputs are separate and

maintain the stereo separation of the input signals.

6. POLARITY

This switch reverses the polarity of the signal going

into the subwoofer amplifier by 180°. It has no effect on

the signal at the line-level outputs.

There is no right or wrong setting for this switch.

Listen to the overall blend of the subwoofer with the

rest of the system and select the switch position that

gives you the best sound for your audience. In fact,

your system may vary when positioned differently and

in alternate venues. Don’t be afraid to experiment with

the position of the polarity switch. See page 11 for more

information.

REVISION

SERIAL NUMBER

WARNING:

TO REDUCE THE RISK OF FIRE OR ELECTRIC

SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR

MOISTURE. DO NOT REMOVE COVER. NO USER SERVICEABLE

PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.

AVIS:

RISQUE DE CHOC ELECTRIQUE — NE PAS OUVRIR

POWER

ON

BA

INPUTS

B

A

B

A

OUTPUTS

HIGH PASS

FULL RANGE

LEVEL

OL SIGNAL POWER

POLARITY

NORMAL

INVERT

THERMAL

+6dB 6dB

-

18-INCH POWERED SOUND REINFORCEMENT SUBWOOFER

118

7

6

5

4

3

9 10

10

7. LEVEL

The LEVEL control adjusts the overall signal level at

the input to the built-in power amplifier. It ranges from

-6 dB to +6 dB (maximum gain), with unity gain at the

center position (12 o’clock).

The control has no effect on the level of the high-

pass outputs [5] or the full-range outputs [4].

8. THERMAL LED

The SRM1801 is equipped with a thermal protection

circuit that monitors the internal temperature of the

amplifiers and heatsink. If the temperature exceeds a

safe operating level, this indicator lights and the input

signal is muted to allow the amplifiers to cool. When

the temperature cools to a safe level once again, the

thermal protection circuit deactivates, the Thermal

LED turns off and the SRM1801 returns to normal

operation.

When the SRM1801 is in thermal protect mode, the

power LED [11] will remain lit, indicating that the unit

is still powered on despite the lack of output.

Activation of the thermal protection circuit

is an indication that you should take steps

to avoid continued thermal problems. See

“Thermal Protection” on page 12.

9. OL LED

The OL (overload) indicator lights when the

amplifier in the SRM1801 is near the clipping point. It

is okay if the OL indicator blinks occasionally, because

this means that the transient peaks are just reaching

the maximum output of the amplifier and you are

getting the most from your SRM1801.

If the OL indicator is blinking frequently or lighting

continuously,turndowntheLEVELcontrol[7]onthe

SRM1801 or turn down the signal at it source

(e.g., the mixing console) until the OL indicator blinks

occasionally or not at all.

10. SIGNAL LED

This LED illuminates green whenever there is a

signal present at the main input connector. It senses the

signal just after the Level control, so adjustments to the

level control will affect the signal indicator.

11. POWER LED

This LED illuminates when the power switch [2] is

turned on and the linecord is connected to an active AC

Mains supply.

REVISION

SERIAL NUMBER

WARNING:

TO REDUCE THE RISK OF FIRE OR ELECTRIC

SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR

MOISTURE. DO NOT REMOVE COVER. NO USER SERVICEABLE

PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.

AVIS:

RISQUE DE CHOC ELECTRIQUE — NE PAS OUVRIR

POWER

ON

BA

INPUTS

B

A

B

A

OUTPUTS

HIGH PASS

FULL RANGE

LEVEL

OL SIGNAL POWER

POLARITY

NORMAL

INVERT

THERMAL

+6dB 6dB

-

18-INCH POWERED SOUND REINFORCEMENT SUBWOOFER

118

7

6

5

4

3

9 10

11

The Ins and Outs of Polarity

Mackie’s SRM1801 subwoofer includes a switch that

allows you to quickly invert the polarity of the

subwoofer’s output relative to the input signal it is

receiving from the mixer or other sound source. But

what exactly does that mean? A subwoofer works by

literally pumping air as the woofer cone moves in and

out with respect to the cabinet in which it is housed. It

does so according to the low-frequency portion of the

signal it receives from the sound source.

The woofer cone is simply following the waveform

as seen in the sine wave in Figure 1. As the sine wave

rises, the woofer cone pushes out. Likewise, as the sine

wave falls, the woofer cone pulls into the cabinet. A

musical signal is much more complex, of course, but the

same principle applies. Movement of the woofer cone

causes air pressure changes that we perceive as sound.

When the Polarity Invert switch [6] is engaged, the

original waveform is simply reversed 180º (see Figure

2). Again, the subwoofer cone follows the waveform.

However, this time the woofer cone starts by pulling into

the cabinet followed by the woofer cone pushing out. If

you have ever experimented with a subwoofer polarity

switch, you may not have noticed any changes to the

sound regardless of its position, especially if you are

listening to just the subwoofer. This is normal, as our

ears perceive them both as the same.

The polarity invert switch comes into play when the

SRM1801 subwoofer is paired with a loudspeaker.

Ideally, the woofer cones of the subwoofer and

full-range loudspeaker would work together by

pushing and pulling in unison. SRM1801 subwoofers are

designed to be used in a broad range of applications,

and with a wide variety of full-range loudspeakers. The

flexibility provided by the polarity switch is necessary

to ensure that you are receiving the best possible sound

from your system, regardless of your setup.

Listed below are some recommended configurations

for pairing a Mackie SRM1801 subwoofer (using the

High-Pass output) with a Mackie full-range

loudspeaker. These settings are a good start, but be sure

to experiment to find the best sound for your venue. The

loudspeakers may be stacked, pole-mounted, or flown.

•SRM450v2 full-range loudspeakers - Disengage the

Polarity Invert switch on the SRM1801.

•TH-15A full-range loudspeakers - Engage the

Polarity Invert switch on the SRM1801.

In alternate setups where the full-range loudspeakers

are not co-located with the subwoofers or are not

connected to the SRM1801 subwoofer’s High-Pass

outputs, you will need to experiment with the Polarity

Invert switch to determine which setting gives you the

desired bass response for your application.

Figure 1 Figure 2

< - - T i m e - - > < - - T i m e - - >

Amplitude

Amplitude

12

Placement

The SRM1801 subwoofer is designed to sit on the

floor or stage. It is not designed to be pole-mounted or

suspended.

When pole-mounting loudspeakers, be sure that the

SRM1801 subwoofers are stabilized and secured from

falling over or being accidentally pushed over. For

stacked scenarios, it is highly suggested that straps are

utilized. Failure to follow these precautions may result

in damage to the equipment, personal injury, or death.

WARNING: The cabinet has no rigging

points and is not suitable for rigging.

NEVER attempt to suspend the SRM1801

by its handles.

As with any powered components, protect them from

moisture and extreme cold and follow the other Care

and Maintenance suggestions below.

Care and Maintenance

Your Mackie subwoofers will provide many years of

reliable service if you follow these guidelines:

• Avoidexposingthesubwooferstomoisture.If

they are set up outdoors, be sure they are under

cover if rain is expected.

• Avoidexposuretoextremecold(below

freezing temperatures). If you must operate

the subwoofers in a cold environment, warm

up the voice coils slowly by sending a low-level

signal through them for about 15 minutes prior

to high-power operation.

• Useadryclothtocleanthecabinets.Onlydo

this when the power is turned off. Avoid getting

moisture into any of the openings of the cabi-

net, particularly where the driver is located.

Protection Circuits

There are several protection mechanisms designed

into the SRM1801 to safeguard the subwoofers and

amplifiers from inadvertent damage.

CAUTION: The protection circuits are

designed to protect the subwoofers under

reasonable and sensible conditions. Should

you choose to ignore the warning signs

(i.e., frequent OL LED indications, excessive distortion),

you can still damage the speakers in the SRM1801 by

overdriving them past the point of amplifier clipping. Such

damage is beyond the scope of the warranty.

Limiting

The driver has its own compression circuit, which

helps protect it from damaging transient peaks. The

compressor is designed to be transparent and is not

noticeable under normal operating conditions.

Overexcursion Protection

A 12 dB/octave high-pass filter at 40 Hz just prior

to the low-frequency amplifier prevents very low

frequencies from being amplified. Excessive low-

frequency energy below 40 Hz can damage the woofer by

causing it to “bottom out,” also known as overexcursion,

which is equivalent to a mechanical form of clipping.

Thermal Protection

All amplifiers produce heat. The SRM1801 is

designed to be efficient both electrically and thermally.

The amplifier module is mounted on a large

heatsink, which is cooled by convection where cool air

is drawn over the rear panel, carrying the heat away.

In order for this convection cooling to work efficiently,

it is important to provide adequate airspace behind

the subwoofer. When you position the SRM1801, we

recommend leaving at least six inches of air space

behind it.

If for some reason the internal temperature gets too

hot, a built-in thermal switch activates and turns down

the amplifier. When the amplifier cools down to a safe

temperature, the thermal switch resets and normal

operation resumes. If the internal temperature again

gets too hot, the output level reduction process repeats.

Should this happen, make sure that airflow to the rear

of the cabinet is not restricted.

13

Appendix A: Service Information

If you think your Mackie product has a problem,

please check out the following troubleshooting tips and

do your best to confirm the problem. Visit the Support

section of our website (www.mackie.com/support) to

get some ideas or contact our technical support heroes.

You may find the answer to the problem without having

to send your Mackie product away.

Troubleshooting

No Power

• Ourfavoritequestion:Isitpluggedin?

• Makesurethelinecordissecurelyseatedinthe

line cord socket and plugged all the way into the

AC outlet.

• MakesuretheACoutletislive(checkwitha

tester or lamp).

• IsthePOWERswitchintheONposition?

• IsthepowerLEDontherearpanelilluminated?

If not, make sure the AC outlet is live. If so, refer

to “No Sound” below.

• IfthepowerLEDsarenotilluminated,andyou

are certain that the AC outlet is live, it is possible

the fuse has blown.

To remove and replace the fuse:

1. Disconnect the power cord from the IEC socket.

2. Remove the fuse drawer using a small screwdriver.

It will slide all the way out.

3. Remove the fuse and replace it with an

equivalent-type fuse.

115 VAC unit: 6.3 amp slo-blo (T 6.3 A H 250 V)

230 VAC unit: 3.15 amp slo-blo (T 3.15 A H 250 V)

4. Replace the fuse drawer by pushing it all the way

back into the IEC socket.

If two fuses blow in a row, then something is very wrong.

Try a different outlet in a totally different location. If fuses

continue to blow, see the “Repair” section on the next page

to find out what to do.

No Sound

• IsthepowerLEDontherearpanelilluminated?

• IstheLEVELcontrolturnedup?

• Isthesignalsourceturnedup?Makesurethe

signal level from the mixing console (or whatever

device immediately precedes the subwoofer) is

high enough to produce sound.

• Ifit’sastereopair,tryswitchingthemaround.

For example, if a left subwoofer is presumed dead,

switch the left and right cords at the subwoofers.

If the problem switches sides, it’s not the

SRM1801. It could be a bad cable, or no signal from

the mixer.

Bad Sound

• Istheinputconnectorpluggedcompletelyinto

the input jack?

• Issomethingconnectedtoanoutputjack?Try

unplugging it. If the sound improves, whatever

was plugged into the output jack may have

affected the signal.

• Isitloudanddistorted?Reducethesignallevelat

the mixer.

• Ifpossible,listentothesignalsourcewith 

headphones plugged into the preamp stage. If it

sounds bad there, it’s not the subwoofer.

• Toomuchbassornotenoughbass?Move 

around the room and see if the bass response

changes. It’s possible your listening position

coincides with a room mode where the

low frequencies either become exaggerated or

nulled. If so, try using an alternate polarity switch

position, moving the subwoofers to a different

location in the room, or moving your listening

position.

FUSE

14

Noise/Hum

• Checkthesignalcablebetweenthemixerand

the subwoofer. Make sure all connections are

secure. These problems usually produce crackling

noises or hum.

• IfyouareusingtwoormoreSRM1801 powered

subwoofers, try plugging them all into the same

AC outlet panel or outlet strip. The purpose for

this is to connect them all to the same earth

ground point and reduce the possibility of creating

a ground loop.

• Ifconnectinganunbalancedoutputtothe 

SRM1801 balanced input, make sure the shield is

connected to the unbalanced ground and to pin 1

of the XLR.

Repair

For warranty service, refer to the warranty

information on page 18.

Non-warranty service for Mackie products is

available at a factory-authorized service center. To

locate your nearest service center, call our Tech

Support department at 1-800-898-3211, Monday-Friday,

during normal business hours, Pacific Time, to explain

the problem. Tech Support will tell you where the

nearest factory-authorized service center is located in

your area.

15

Appendix B:

Connections

XLR Connectors

The SRM1801 has two female XLR input jacks that

accept balanced line-level signals. When connecting

a balanced signal, be sure it’s wired per AES (Audio

Engineering Society) standards:

XLR

Pin 1 – Shield (Ground)

Pin 2 – Hot (+)

Pin 3 – Cold (–)

You should use high-quality, shielded cable to

connect the signal source to the INPUT jacks on the

SRM1801.

• Highqualitymicrophonecablesworkwell.

• Foilshieldedcablesarecommonlyusedforaudio

wiring.

• Thebettertheshield,thebettertheimmunity

from externally induced noise (like EMI and

RFI). Route the cable away from AC power cords

and outlets. These are common sources for hum

in an audio signal. You can purchase quality

cables from your Mackie dealer.

There are also two male XLR connectors on the

SRM1801 labeled FULL RANGE and two labled HIGH

PASS. These are also wired according to the AES

standards listed above.

The FULL RANGE connectors allow you to connect

several SRM1801’s. Simply plug the signal source

(e.g., mixer output) into the SRM1801 input jack, and

patch that subwoofer’s full range jack to the next

subwoofer’s input jack, and so on, daisy-chaining

multiple subwoofers.

There is a limit to how many you can

daisy-chain together. A general rule is

to maintain a load impedance ten times

or more than the source impedance to

prevent excessive loading on the source. For example, if

your mixer has an output impedance of 120 ohms, then

you can daisy chain up to nine SRM1801’s. This is a load

of 1222 ohms (SRM1801 input impedance=11 kohms;

9 of these in parallel=1222 ohms). Since microphones

typically have a higher output impedance, you should

limit daisy-chaining from a mic source to two SRM1801’s

(assuming that loudspeakers are also connected to the

subwoofers).

Balanced XLR Connectors

16

Appendix C: SRM1801 Specifications

AC Power Requirements

US: 100-120 VAC, 50-60 Hz

Fuse: T 6.3A H 250V

Europe: 220-240 VAC, 50-60 Hz

Fuse: T 3.15A H 250V

Power Consumption: 160 watts @ 1/4 power

AC Connector: 3-pin IEC 250 VAC,

15 A male

Construction Features

Basic Design: Trapezoidal

Material: Void-free plywood

Finish: Textured black catalyzed

polyurethane paint

Handles: One on each side

Grille: Perforated metal

Physical Properties

Height: 24.1 in / 612 mm

Front Width: 20.2 in / 513 mm

Rear Width: 15.1 in / 383 mm

Depth: 25.3 in / 643 mm

Weight: 73 lb / 33.1 kg

Mounting Method:

The SRM1801 subwoofer is designed to sit on the floor or

stage. It is NOT designed to be pole-mounted or suspended. The

cabinet has no rigging points and is not suitable for rigging.

Never attempt to suspend the SRM1801 by its handles.

LOUD Technologies Inc. is always striving to improve our products

by incorporating new and improved materials, components, and

manufacturing methods. Therefore, we reserve the right to change

these specifications at any time without notice.

“Mackie,” and the “Running Man” are registered trademarks of LOUD

Technologies Inc. All other brand names mentioned are trademarks

or registered trademarks of their respective holders, and are hereby

acknowledged.

©2010 LOUD Technologies Inc. All Rights Reserved.

Acoustic Performance

Frequency Range (–10 dB): 35 Hz – 150 Hz

Frequency Response (–3 dB): 50 Hz – 115 Hz

Max peak SPL (calculated)1: 129 dB

Max peak SPL (measured)2: 124 dB

Transducer

Diameter: 18 in / 457 mm

Voice coil diameter: 3 in / 76 mm

Diaphragm material: Paper

Magnet material: Ferrite

Power Amplier

Rated Power: 500 watts rms

1000 watts peak

THD: <0.1%

Design: Class D

Cooling: Convection

Input/Output

Input Type: Female XLR Balanced

differential (stereo

left/right)

Input Impedance: 20 k balanced

Full Range Output: Male XLR Balanced

(parallel with input)

High Pass Output: Male XLR Balanced

Level Control: –6 dB to +6 dB

Electronic Crossover

Crossover Type: 24 dB/oct.

Linkwitz- Riley

Crossover Frequency: 125 Hz

Protection Features

Over-excursion Protection: 40 Hz 24 dB/oct.

Butterworth High

Pass Filter

Thermal Protection: Amplifier mute, auto

reset

Driver Protection: Peak/RMS Limiter

Display LEDs: Thermal, OL, Signal,

Power

1 Calculated from peak driver sensitivity and amplifier power, half space.

2 Measured with swept sine at 1 W within operating range, scaled for max power, half space.

17

24.1 in /

612 mm

25.3 in /

643 mm

20.2 in / 513 mm

W E I G H T

73 lb

33.1 kg

15.1 in /

383 mm

SRM1801 Dimensions

SRM1801 Frequency Response

1/3 Octave Response

Normalized to 0 dB SPL

Frequency (Hz)

+10

+0

–10

–20

–30

–40

20 50 100 200 400

20 50 100 200 400

Frequency (Hz)

1/3 Octave Response

Normalized to 0 dB SPL

+10

+0

-10

-20

-30

-40

18

Correct Disposal of this product: This symbol indicates that this product should not be disposed of with your household waste, according to the WEEE

Directive (2002/96/EC) and your national law. This product should be handed over to an authorized collection site for recycling waste electrical and

electronic equipment (EEE). Improper handling of this type of waste could have a possible negative impact on the environment and human health due

to potentially hazardous substances that are generally associated with EEE. At the same time, your cooperation in the correct disposal of this product will

contribute to the effective usage of natural resources. For more information about where you can drop off your waste equipment for recycling, please

contact your local city office, waste authority, or your household waste disposal service.

Mackie Limited Warranty

Please keep your sales receipt in a safe place.

This Limited Product Warranty (“Product Warranty”) is provided by LOUD Technologies Inc. (“LOUD”)

and is applicable to products purchased in the United States or Canada through a LOUD-authorized

reseller or dealer. The Product Warranty will not extend to anyone other than the original purchaser of

the product (hereinafter, “Customer,” “you” or “your”).

For products purchased outside the U.S. or Canada, please visit www.mackie.com/warranty to find

contact information for your local distributor, and information on any warranty coverage provided by the

distributor in your local market.

LOUD warrants to Customer that the product will be free from defects in materials and workmanship

under normal use during the Warranty Period. If the product fails to conform to the warranty then LOUD

or its authorized service representative will at its option, either repair or replace any such nonconforming

product, provided that Customer gives notice of the noncompliance within the Warranty Period to the

Company at: www.mackie.com/support or by calling LOUD technical support at 1.800.898.3211 (toll-

free in the U.S. and Canada) during normal business hours Pacific Time, excluding weekends or LOUD

holidays. Please retain the original dated sales receipt as evidence of the date of purchase. You will need it

to obtain any warranty service.

For full terms and conditions, as well as the specific duration of the Warranty for this product, please visit

www.mackie.com/warranty.

The Product Warranty, together with your invoice or receipt, and the terms and conditions located

at www.mackie.com/warranty constitutes the entire agreement, and supersedes any and all prior

agreements between LOUD and Customer related to the subject matter hereof. No amendment,

modification or waiver of any of the provisions of this Product Warranty will be valid unless set forth in a

written instrument signed by the party to be bound thereby.

Need help with your new subwoofer?

• Visit www.mackie.com and click Support to nd: FAQs, manuals, addendums, and other documents.

• Email us at: techmail@mackie.com.

• Telephone 1-800-898-3211 to speak with one of our splendid technical support chaps (Monday

through Friday, normal business hours, PST).

16220 Wood-Red Road NE • Woodinville, WA 98072 • USA

United States and Canada: 800.898.3211

Europe, Asia, Central and South America: 425.487.4333

Middle East and Africa: 31.20.654.4000

Fax: 425.487.4337 • www.mackie.com

E-mail: sales@mackie.com