Meyer Sound Reinforcement Loudspeaker Msl 3A Users Manual

MSL-3A to the manual 5d37dd7a-f2c2-4194-8026-612c7675955e

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Features

High power

High clarity and coherence

Arrayable

Rugged

Long-term reliability

Applications

Main PA arrays

Concert reinforcement

Theater sound reinforcement

Live music club systems

High-power announcing

Paging indoors/outdoors

MSL-3A

Meyer Sound Laboratories, Inc.

2832 San Pablo Avenue

Berkeley, CA 94702

(510) 486-1166

FAX (510) 486-8356

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Inches

Reinforcement

Loudspeaker

vented enclosure, and a single high fre-

quency driver with a 70-degree horn. The

rugged, multiple-ply hardwood cabinet is

fitted with handles and, optionally, aircraft-

style rigging pan fittings.

The MSL-3A requires a high-quality

professional stereo power amplifier capable

of delivering up to 400 watts/channel

continuously into 4 ohms, with a signal

voltage gain of 10 dB (minimum) to 30 dB

(maximum).

Designed to perform in a wide range of

large-scale sound reinforcement applica-

tions, the high-power, arrayable MSL-3A

allows for coherent, controlled coverage

of wide areas in theater, club and concert

sound reinforcement. The efficient loud-

speaker delivers high sound pressure levels

with extremely low distortion, for maxi-

mum intelligibility and fidelity.

The biamplified loudspeaker consists

of two proprietary 12-inch low-frequency

cone drivers in a unique horn-loaded,

Acoustical – MSL-3A/M-3A System

Frequency response

1

75-18k Hz ±4 dB

Maximum SPL

2

Continuous 130 dB

Peak 135 dB

HF Coverage

Horizontal 70 degrees

Vertical 60 degrees

Acoustical Crossover Frequency 800 Hz

MSL-3A Loudspeaker

Transducers

Low Frequency (2) MS-12 12-inch cone drivers, 8 ohms per driver

High Frequency MS-2001A 2-inch throat (4" diaphragm) driver, 12 ohms

High-Frequency Horn 70-degree modified radial

HF DC Protection 20 µF Polypropylene capacitor

Enclosure Vented, horn loaded, multi-ply Finnish birch

Finish Black textured, charcoal-grey carpet (optional)

or black weather protected (optional)

Physical Dimensions 21

1

⁄4" W x 56

3

⁄4" H x 30" D

Weight 241 lbs. (109.3 kg)

Protective Grill Hex perforated metal screen, damped,

charcoal-grey foam covering

Connector EP-4 male, EP-5 male (Europe only),

Pyle National (optional)

Rigging (optional) Aircraft pan fittings, 600 lbs. safe working load each

M-3A Control Electronic Unit

Input Type

3

Balanced ISO-Input,

™

10k ohms

Output Type Active, push-pull, 200 ohms output impedance

Maximum Input Level

Balanced +23 dBu

Unbalanced +23 dBu

Maximum Output Level

4

Balanced +26 dBu

Unbalanced +20 dBu

Hum and Noise

5

-90 dBV

Dynamic Range

6

>110 dB

Sense Inputs 10K ohms true differential, opto-isolated

Electrical Crossover Frequency 800 Hz

High Frequency Delay Type Active all-pass

Driver Protection Circuitry

Low Frequency RMS limiter

High Frequency RMS limiter

VHF Peak limiter

Indicators

Sense; Hi and Lo Green/ Red LEDs

Limit; Hi, Lo, and VHF Red LEDs

Safe Green LED

Power Green/Red LEDs

Controls

Front Panel Input attenuator, AC power switch

Preset Panel Lo Cut switch, Safe switch, HF EQ Switch

VHF Var/Cal switch, VHF control

MSL-3A Specifications

Note 1:

Measured 1 meter on-axis,

half-space conditions,

pink noise input, in third-

octave bands.

Note 2:

Loudspeaker driven with “A”

weighted noise (peak-to-RMS

ratio

≈

12␣dB), with power

amplifier rated at 400W per

channel at 4 ohms.

Note 3:

ISO™ Input: Pins 1, 2 and 3

are transformer-isolated, and

shell is connected to chassis/

AC earth ground. Pin 3 positive

for positive pressure output.

Note 4:

800 Hz (worst case frequency

both channels), <0.1% THD.

Note 5:

“A”-weighted, unbalanced.

Note 6:

“A”-weighted noise floor to

maximum output at 800 Hz.

M-3A Control Electronics Unit

Connectors

Balanced Input/Output 3-pin XLR (A-3) female/male

Sense Inputs Banana jacks

Power 120/240V AC, 50/60 Hz (internally switchable)

Physical Dimensions 19" W x 1

3

⁄4" H x 7

3

⁄4" D, Standard rack mount

Weight 8 lbs. (3.6 kg)

The MSL-3A loudspeaker operates as a

system with the M-3A Control Electronics

Unit (one per channel). Optimized for the

MSL-3A and pre-aligned at the factory, the

M-3A contains frequency response and

phase response alignment circuitry, and

Meyer Sound’s exclusive SpeakerSense

™

driver protection circuitry, incorporating

both peak and RMS signal limiting.

A single-channel device operating at

line level, the M-3A is intended to be the

final component in the signal chain before

the power amplifier. Its factory-calibrated

SpeakerSense circuitry protects the MSL-

3A loudspeaker components from damage

due to overheating under high power

conditions. This unique circuit continu-

ously monitors the power applied to the

MSL-3A drivers, and individually limits the

high-frequency and low-frequency out-

puts when the safe operating limits of the

drivers are exceeded.

Until the onset of overload, the Speaker-

Sense circuitry has no effect on the signal.

Also provided is a switch-selectable Safe

function which widens the safety margin of

the system by decreasing the SpeakerSense

limiting threshold 6 dB, and is intended to

be used when extended periods of overload

are anticipated.

To enhance the effectiveness of the

MSL-3A in voice reinforcement applica-

tions, the M-3A incorporates filters which

band-limit the system response under full-

power conditions. This has the effect of

increasing intelligibility by discriminating

for vocal information in the signal. In

music reinforcement applications, the

Meyer Sound DS-2 Mid-Bass Loudspeaker

and 650-R2 Concert Subwoofer are recom-

mended to extend the system’s low-

frequency response and power bandwidth.

The M-3A contains logic

circuits within the sense

circuitry that monitors safe

operating conditions. In the

event of amplifier gain in

excess of 32dB, amplifier

failure or switched sense

lines, the M-3A outputs will be

muted to prevent speaker

damage.

UltraSeries™ M-3A Power

Sense Limit

Safe Lo CutHF Eq

Safe

∞

20

10

843

2

1

0

Attn dB

5

6

Lo

Hi

VHF

Cal

VHF

Var

Boost Cut

Architectural and

Engineering Specifications

MSL-3A/M-3A

The loudspeaker system shall be of the

two-way type with two 12" low-frequency

loudspeakers front-mounted in a combina-

tion front-loaded horn constructed of

fiberglass with two removable plugs which

adjust the horn for an exponential flare, a

compression driver mounted on a high-

frequency fiberglass horn with a 2" throat.

The low-frequency and high-frequency

horns and drivers shall be securely

mounted in the bass reflex hardwood-

plywood enclosure, and the loudspeaker

shall operate with a companion Control

Electronics Unit.

The Control Electronics Unit shall

contain a power supply capable of oper-

ating from a 120/240V AC, 50/60 Hz line,

electronic crossover circuitry, electronic

delay for the phase alignment of the high-

frequency horn/driver. Low and high

frequency sliding filters which automati-

cally activate under high power conditions,

RMS limiters which protect the speakers

from overheating, equalization circuitry,

active balanced input, indicator LED’s

for power on and limiters. Total harmonic

distortion shall be less than 0.1%. “A”

weighted noise level shall be at least 110␣dB

below maximum rated output of +24␣dBV.

The speaker system, when combined

with the Control Electronics Unit and a

stereo power amplifier rated at 400 watts/

channel into 4 ohms, shall meet the fol-

lowing criteria: Frequency response, 75 to

18,000 Hz plus or minus 4 dB measured

with

1

⁄

3

octave noise, 130 dB SPL of contin-

uous pink noise output at 1 meter and

peaks of 135 dB SPL. Distribution pattern,

60 degrees vertical, 70 degrees horizontal.

Speaker enclosure dimensions shall be

21

1

⁄

4

" W x 56

3

⁄

4

" H x 30" D, weight 241 lbs

(109.3 kg).

Control Electronics Unit dimensions

shall be 19" W x 1

3

⁄

4

" H x 7

3

⁄

4

" D, weight

8␣lbs (3.6 kg).

The horn loudspeaker system shall be

the Meyer Sound MSL-3A. The Control

Electronics Unit shall be the Meyer

Sound M-3A.

Meyer Sound Laboratories has

devoted itself to designing,

manufacturing, and refining com-

ponents that deliver superb sonic

reproduction. Every part of every

component is designed and built

to exacting specifications and

undergoes rigorous, comprehen-

sive testing in the laboratories.

Research remains an integral,

driving force behind all pro-

duction. Meyer strives for sound

quality that is predictable and

neutral over an extended lifetime

and across an extended range.

© 1994 Meyer Sound 04071066.02 A3

Meyer Sound Laboratories, Inc.

2832 San Pablo Avenue

Berkeley, CA 94702

(510) 486-1166

FAX (510) 486-8356

Sound

engineering

for the art

and science

of sound.

30.00 30.26

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C

7.5°

Physical Dimensions