Mtx Audio Jackhammer Users Manual

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MTX.COM

OWNER’S MANUAL

MTX.COM

SPECIFICATIONS

INTRODUCTION

Thank you for choosing MTX to help you reach your ultimate goal with your vehicle. The MTX JackHammer is

a true 22" subwoofer with power and performance beyond anything ever attempted in the mobile audio world.

This behemoth, is capable of handling 6,000 watts of RMS power. Designed for those who want to show off

the biggest woofer ever made no matter the price, the JackHammer will fi t into most full-sized SUVs and

some shorter models, like Escalades, with the third seat removed.

There are two versions of the JackHammer built for different applications. The SPL model (T9922-22) is

perfect for excessive bass and competition use, while the SQL model (T9922-44) offers increased sound

quality for “real life” listening. Both of these kits will work in the same motor for easy installation of either unit.

You can order either of these models or just a re-cone replacement kit for the other and switch between the

two without reinstalling the entire woofer. For more information, see the Piston Change (Re-cone Kit) section

in this manual or call 1-800-CALL-MTX.

The most enormous subwoofer to date, the JackHammer is just the newest example of how MTX is the

biggest, baddest, boldest car audio...ever!

BEFORE STARTING

It is very important that you have your JackHammer installed by an authorized MTX Elite Status retailer,

preferably MECP certifi ed. Before installation, make sure you have read the instructions carefully and have

the following equipment:

• Fork Lift (or another means of lifting approximately 370 lbs.)

• Electric drill • 5⁄32" drill bit • 5⁄32", 4mm, 3⁄16" hex keys

• Safety glasses • T-30 Torx • 3mm hex wrench (if re-coning)

• Six 5⁄8"-11 bolts 1 3⁄4" long • 15⁄16" wrench or socket

ELECTRICAL UPGRADE

A factory electrical system will not be able to handle the power requirements of the amplifi ers that are

needed to drive the JackHammer. You will need to upgrade your vehicle’s electrical system with both

additional batteries and alternators. MTX Audio recommends West Co. SVR80 or SVR100 because they are

a sealed battery that can be mounted in any confi guration and supply the power needed and high-output

alternators from either Ohio Generator or PowerMaster. Also, it is recommended to use anywhere from 3 to 6

StreetWires capacitors to help control the fl ow of power, call 877.STREET1 for more information. The diagram

below shows the wiring needs of your entire vehicle. Please see the Strapping Thunder Amplifi ers section for

further information.

T9922-44

Fs = 16.76 Hz

Qms = 5.19

Vas = 239.1 liters

Cms = 0.063 mm/N

Mms = 1428 g

Rms = 29.04 kg/s

Xmax = 2.5 in

Xmech = 3 in

P-Dia = 17.95 in

Sd = 1642 sq.cm

P-Vd = 0.366 cu.ft

Qes = 0.6

Re = 1.66 ohms

BL = 20.39 Tm

Qts = 0.538

no = 0.181 %

2.83V SPL = 91.55 dB

Model T9922-44 T9922-22

Description 22” SuperWoofer 22” SuperWoofer

Impedance Dual 4 Ohm Dual 2 Ohm

Frequency Response 20Hz-150Hz 20Hz-150Hz

Power Handling (RMS) 6000 Watts 6000 Watts

Recommended RMS

Amplifi er Power 3000-6000 Watts 3000-6000 Watts

Voice Coil Diameter 6.5” 6.5”

Magnet Weight 900 oz. 900 oz.

Mounting Depth 211⁄16”21

1⁄16”

Cut Out Diameter 201⁄4”20

1⁄4”

Sealed Enclosure Net Volume 4.2 ft3TBD

Vented Enclosure Net Volume 8.7 ft3TBD

Port Dimensions (Slot Port) 241⁄8”H x 33⁄16”W x 10”L

Speaker Displacement 1.8 ft31.8 ft3

Port Displacement .5 ft3TBD

Tune Frequency 32Hz TBD

T9922-22

Fs = TBD

Qms = TBD

Vas = TBD

Cms = TBD

Mms = TBD

Rms = TBD

Xmax = TBD

Xmech = TBD

P-Dia = TBD

Sd = TBD

P-Vd = TBD

Qes = TBD

Re = TBD

BL = TBD

Qts = TBD

no = TBD

2.83V SPL = TBD

1F 1F1F

1F 1F1F

StreetWires

Distribution

Blocks

StreetWires

Capacitors

StreetWires

1/0 AWG Wire

200 Amp

Minimum

StreetWires

1/0 AWG Wire

StreetWires

1/0 AWG Wire

StreetWires

4 AWG Wire

StreetWires

4 AWG Wire

Isolator

or Relay

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For Vented Enclosures

The JackHammer requires a volume of 8.7 cubic ft (net) per woofer. The woofer’s displacement is 1.8 cubic ft.

The port’s internal dimensions are 24-1⁄8" x 3-3⁄16" x 10" and it takes approximately

.5 cubic ft. The total gross volume will be 11.0 cubic ft.

The fi nal tuning frequency is 32Hz. Additional vented box suggestions are 7.75 to 9.5 (net) cubic ft. Remember

to account for the driver (1.8 cubic ft) and the port displacement, with port tuning ranges from 32 to 42Hz,

when mounting.

RECOMMENDED ENCLOSURE REQUIREMENTS

For Sealed Enclosures

The JackHammer requires a volume of 4.2 cubic ft (net) per woofer. The woofer’s displacement is 1.8 cubic ft.

The total gross volume will be 6 cubic ft.

Additional ranges of sealed volumes for a sealed box is 5 cubic ft or greater gross volume.

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WIRING OPTIONS

Often overlooked, the installation components used to connect the entire system need to match the maximum

capability of the system or you will lose performance. MTX Audio recommends using StreetWires 4 AWG

cable as the speaker wire.

Dual Voice Coil Wiring

JackHammer Superwoofers are available in a dual 2 Ohm (T9922-22) or dual 4 Ohm (T9922-44) voice coil

confi guration for either SPL or SQL uses. The voice coils are labeled VC1 and VC2.

Note: Both voice coils should always be connected. See the section on Strapping Thunder Amplifi ers

for amplifi er connections.

Independent Voice Coil Connection Confi guration

This connection is ideal when using two Thunder TA81001 amplifi ers per voice coil (4 amplifi ers total).

See the section on Strapping Thunder Amplifi ers for amplifi er connections.

Parallel Confi guration

T9922-44 – Wiring the voice coils in a parallel confi guration will have a total fi nal load of 2 Ohm. Connect each

of the dual voice coil’s positive terminals together so that they share the same source (amplifi er). Do the same

for the negative terminals. This connection is ideal when using two Thunder TA92001 amplifi ers.

T9922-22 – Wiring the voice coils in a parallel confi guration will have a total fi nal load of 1 Ohm. Connect each

of the dual voice coil’s positive terminals together so that they share the same source (amplifi er). Do the same

for the negative terminals.

Note: The wiring of the dual voice coils will affect impedance for the amplifi er system. Care must be taken

to assure that the resulting impedance does not exceed the amplifi er’s requirements.

MOUNTING

Mounting the JackHammer is nothing that can be taken lightly, quite literally. You need to follow the steps

below carefully and have all the necessary equipment. You will need to be able to lift the nearly 370 lbs.

subwoofer comfortably. MTX Audio recommends a fork lift for safe installation.

The woofer is designed to distribute its weight evenly throughout the entire structure. This is accomplished by

including rear motor mounts with 5⁄8"-11 bolts so it is mounted from both the front and the back. It is important

that both these sides are mounted properly to ensure proper weight distribution. The drawing above shows

the rear mounting hole detail for the back support. The holes are located on an 8 5⁄8" bolt circle, meaning the

holes are located on a radius of 4 5⁄16" from the center point. Use the pallet from the Jackhammer packaging

to make a mounting template if needed. For the recommended 1" baffl e, the bolts needed should be 5⁄8"-11

threaded bolts 1 3⁄4" long. Washers should be used with the 5⁄8"-11 bolts to be sure there will be no air leaks

around the bolts.

Note: MTX Audio also recommends making the back of the enclosure removable to replace the woofer

cone if ever needed. This would make it possible to replace the cone assembly without removing the

woofer.

In the gasket of the woofer, there are four eyelet rings. Make sure they are screwed in securely and then

attach a chain between them for lifting. Use one tine of the fork lift to lift the JackHammer with the chain then

slowly lower it into the enclosure. Unscrew the eyelets and align the woofer with the front and rear mounting

holes, and then fasten it using the screws and bolts provided. Remember to pre-drill the screw holes using a

5⁄32" drill bit. Then, lift the enclosure, complete with JackHammer, into the back of the vehicle.

For models shipped already in the enclosure, installation becomes a step easier; you need to just lift the

enclosure with JackHammer into the back of the vehicle. Continue on to the wiring section.

Note: This unit is EXTREMELY heavy! Make sure everyone is clear and out of the way in case something

should break or fall!

Note: MTX Audio is not responsible for damages occurred during installation. For custom installation help

or answers to further questions, please call 1-800-CALL-MTX.

MTX.COM

PHASE

0180

180

0

PHASE

0180

CAP+ +BATT REM -GND CAP-

1/0 AWG

1/0 AWG

16 AWG

4 AWG

4 AWG

Amplifier driving JackHammer’s negative

terminal of 2nd Voice Coil

Amplifier driving JackHammer’s positive

terminal of 1st Voice Coil

Amplifier’s main

power terminals

Woofer Terminal Connection

(2 ohm connection)

Minimum 8awg

Speaker wire

8 AWG

8 AWG

Figure 1

Figure 2

STRAPPING THUNDER AMPLIFIERS

Strapping amplifi ers brings two mono-block amps together and unleashes the power of both into a single

channel confi guration. Think of it like a bridged 2-channel amp which takes a left channel and a right channel

and combines them into one output. Strapping is essentially the same process. One of the mono-block amps

serves as “one channel” and the other mono-block amp as the “second channel.” The primary difference is

that the two mono-block amps are not in the same heatsink like the channels of a 2-channel amp.

Strapping requires that the two mono-block amps function as one, so they must be setup to work together.

Both amps need to receive the same exact signal, same exact level of signal, same exact voltage, etc... Just

follow this guide to build the Biggest, Baddest, Boldest system...ever.

It has never been easier to strap two MTX Thunder TA92001s, or even two Thunder TA81001s, together to get

maximum power from these super amplifi ers. When strapped, expect power output to exceed 6,000 watts

RMS for two TA92001 amps with a current draw around 600 amps. Or, for two TA81001 amps, over 3,000 watts

of RMS power with a current draw of around 300 amps (Table 1).

ELECTRICAL SYSTEM UPGRADES

When strapping Thunder Amplifi ers, it is important to remember that to get the desired power from them,

you need to supply them with the power they require. You must upgrade the stock battery and add additional

batteries to the system. We recommend a minimum of three batteries with a cold cranking amp (CCA) rating

of 725 or more. Please remember to install a minimum of 1/0 AWG StreetWires power and ground cable for

each alternator. Two 200 amp or greater alternators are strongly recommend for this system because these

amplifi ers are capable of pulling more than 600 amps. After your bank of minimum three batteries, you will

need to run 1/0 wire to each amplifi er. Just adding extra batteries will not solve the need for power. It will

actually put more of a load on the alternator, in turn yielding less power to the audio system.

MTX Audio recommends West Co. SVR80 or SVR100 because they are a sealed battery that can be mounted

in any confi guration and supply the power needed, and high-output alternators from either Ohio Generator or

PowerMaster.

STRAPPING TWO TA92001 AMPLIFIERS

To successfully strap two TA92001 amplifi ers, follow the process outlined here carefully. It details how to

confi gure each amp so one becomes the “positive” (Push) amplifi er and the other becomes the “negative”

(Pull) amplifi er.

1. Connect the amplifi ers’ power, ground, and remote but do not supply the 12 volts from the batteries to the

amplifi ers until later in the process.

2. Label the fi rst amplifi er as the Positive amp. Set the phase switch on this amp to 0˚. Label the second

amplifi er as the Negative amp and set the phase switch on this amp to 180˚ (Figure 1).

3. Using a “Y” adapter, split the “Left” side of the RCA output from the source to the “Left” RCA input

receptacles on each amp. Using another “Y” adapter, split the “Right” side of the RCA output from the

source to the “Right” RCA input receptacles on each amp (Figure 1).

Note: Only the positive speaker terminals on each amplifi er will be used.

4. Connect the positive side of the speaker wire to the “positive” speaker terminal of the amplifi er labeled

Positive. Connect the negative side of the speaker wire to the “positive” speaker terminal of the amp

labeled Negative (Figure 2).

Note: The voice coils on the JackHammer must be paralleled (Figure 2). Be sure that the impedance of

the subwoofer is no lower than a 2 ohm load to avoid possible damage to the amplifi er.

Table 1: RMS Power Output for Strapped Thunder Amplifi ers

Two TA92001 Two TA81001

14.4Vdc @ 4Ω4000 Watts 2000 Watts

14.4Vdc @ 2Ω6000 Watts 3000 Watts

(wattage is combined power from all amps)

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5. Check to be sure all connections are made and the impedance is within range. Once everything is setup

correctly, supply the amplifi ers with the 12 volts of power from the batteries.

STRAPPING TWO TA81001 AMPLIFIERS PER VOICE COIL

It is also possible to connect four TA81001 amplifi ers by strapping two TA81001s per voice coil. To do this,

follow the steps when strapping two TA92001. Those procedures are outlined earlier in this manual. The only

exception is that you will now be using two amplifi ers for each voice coil. See Figure 3.

Gain setting is done the same as the two TA92001 setup.

Note: Using two TA81001 amps strapped per voice coil produces a total of over 4,000 watts of RMS power

with a current draw of around 400 amps.

SETTINGS AND TUNING

Strapped amplifi ers require “gain matching.” This is the process of adjusting each amplifi er’s gain, frequency,

and EQ to be sure both amplifi ers are sending the same AC voltage to the woofer. This will require a volt

ohm/multi meter and test tones.

1. Disconnect the speaker wires from each of the amplifi er’s output terminals. It is important to measure the

amplifi er’s output with no load (i.e. no speakers connected to the output terminals of the amplifi er).

2. Set the volume of the headunit to max output (before clipping occurs), play a fl at tone (60-80Hz) through

the source unit, and hit repeat. Use this same frequency and volume throughout this process.

3. Set the gains on each amplifi er to the most sensitive setting within their proper range. Make sure the input

sensitivity is set to the x1 setting for a low level RCA input. (See the amplifi er’s quick install sheet for gain

adjustments).

4. Set the multi meter to AC voltage and connect it to the Positive amplifi er’s positive and negative output

terminals to measure that amplifi er’s output voltage. Switch the multi meter between the amps and

measure each of them to determine which one has the lowest output.

Note: Even the difference of 1 volt can signifi cantly alter the performance of your system.

5. Match the other amplifi er’s gain to the one with the lowest output. Use the fl at tones to gauge what are

necessary adjustments.

6. Now that you have matched your amps you will need to set the crossover. It is recommended to have a

crossover setting of 60-80Hz and the subsonic fi lter turned off.

7. The parametric EQ can be used to adjust ±12dB from 30-80Hz with a variable “Q” of 0.5 to 4. Using the

boost in the 60-80Hz region with a “Q” of 1 or 2 is suggested. The “Q” adjusts the bandwidth of frequencies

that are boosted or cut. For more information, read the owner’s manual for the amplifi er.

8 AWG

CAP+ +BATT REM -GND CAP-

1/0 AWG

1/0 AWG

16 AWG

4 AWG

4 AWG

Amplifiers main

power terminals

Amplifier driving JackHammer’s negative

terminal of 1st Voice Coil

Woofer Terminal Connection

(Two 4 ohm connections)

Minimum 8awg

Speaker wire

Minimum 8awg

Speaker wire

Amplifier driving JackHammer’s positive

terminal of 1st Voice Coil

Amplifier driving JackHammer’s positive

Amplifier driving JackHammer’s positive

terminal of 2nd Voice Coil

terminal of 2nd Voice Coil

Amplifier driving JackHammer’s positive

terminal of 2nd Voice Coil

8 AWG

8 AWG

8 AWG

Amplifier driving JackHammer’s negative

Amplifier driving JackHammer’s negative

terminal of 2nd Voice Coil

terminal of 2nd Voice Coil

Amplifier driving JackHammer’s negative

terminal of 2nd Voice Coil

Figure 3

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PISTON CHANGE (RE-CONE KIT)

Along with the excessive SPL, MTX has created a replaceable cone assembly so the competition level of

bass (done with the dual 2Ω voice coils) can be switched out with a dual 4Ω voice coil for every day listening

with increased sonic quality and still be the same speaker with excessive high SPL. But since the installation

of the JackHammer is a large investment in time and resources, the cone can be removed without removing

the entire sub or enclosure.

Re-coning the woofer is surprisingly easy. No glue is needed, just bolts, and if you followed the enclosure

design it can be done without taking the woofer out of the enclosure. Directions for either procedure follow.

To Re-cone the Woofer when Removed from the Enclosure

To remove the cone, unscrew the twelve 3⁄16" hex screws from the front gasket of the woofer and remove the

gasket. Next remove the six 5⁄32" hex screws from the back of the spider plateau and loosen the tinsel leads at

the terminal. The tinsel leads are the four 3mm hex screws at the top of the terminal that hold the voice coil

wires. Gently pull on the cone under the surround and the cone assembly should pull away from the woofer

motor. Be sure and pull evenly to prevent the assembly from binding in the basket. You are now ready to put in

the new re-cone kit.

Place the new cone assembly into the woofer motor. Make sure to align the tinsel leads from the re-cone kit

with the terminals and line up the large notches in the surround with the largest holes in the basket. Insert

the tinsel leads into the terminal ensuring the red lead is going into the positive (+) position and the black lead

is going into the negative (–) position. Tighten the four set screws and then slightly tug in the tinsel leads to

make sure they are tight in the terminal.

Next, insert the six 5⁄32” hex screws back into the spider plateau and tighten. Replace the top gasket over

the surround on the top of the woofer. The counter-bore holes in the gasket need to align with the smaller

threaded holes in the basket. Insert the twelve 3⁄16" hex gasket screws into the counter-bored holes and

tighten. Your new cone is now installed and you are ready to once again experience the JackHammer’s

extreme bass!

To Re-cone the Woofer when Installed in the Enclosure

If you have made the back removable, as suggested earlier in this manual, you can remove the cone without

removing the woofer from the enclosure. To remove the cone, unscrew the twelve 3⁄16" hex screws from the

front gasket of the woofer and then remove the top gasket. DO NOT remove the T-30 wood screws because

the gasket can be removed with these still in place. Next, remove the six 5⁄8" bolts from the back with a 15⁄16"

wrench and pull off the back of the enclosure. Then, remove the six 5⁄32" hex screws from the back of the

spider plateau and loosen the tinsel leads at the terminal. The tinsel leads are the four 3mm hex screws at

the top of the terminal that hold the voice coil wires. Gently pull on the cone under the surround and the cone

assembly should pull away from the woofer motor. Be sure and pull evenly to prevent the assembly from

binding in the basket. You are now ready to put in the new re-cone kit.

Place the new cone assembly into the woofer motor. Make sure to align the tinsel leads from the re-cone kit

with the terminals and line up the large notches in the surround with the largest holes in the basket. Insert

the tinsel leads into the terminal ensuring the red lead is going into the positive (+) position and the black lead

is going into the negative (–) position. Tighten the four set screws and then slightly tug in the tinsel leads to

make sure they are tight in the terminal.

Next, insert the six 5⁄32" hex screws back into the spider plateau and tighten. Replace the top gasket over

the surround on the top of the woofer. The counter-bore holes in the gasket need to align with the smaller

threaded holes in the basket. Insert the twelve 3⁄16" hex gasket screws into the counter-bored holes and

tighten. Finally, replace the back of the enclosure and re-attach the 5⁄8" bolts to support the back of the woofer.

Your new cone is now installed and you are ready to once again experience the JackHammer’s extreme

bass!

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MTX.COM

NOTES: NOTES:

© 2005 MTX. All rights reserved. MTX, Thunder, JackHammer and StreetWires are trademarks of

Mitek. Designed and Engineered in the U.S.A.

Due to continual product development, all specifi cations are subject to change without notice.

MTX Audio, 1 Mitek Plaza, Winslow, IL 61089 U.S.A.

MTX002140 RevB 11/05 21A8416

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