Meyer Sound Loudspeaker Msl 10A Users Manual

MSL-10A to the manual 1528d811-32d9-4733-9d0b-1372cf0395fb

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MSL-10A

High Power

Loudspeaker

System

The Meyer Sound MSL-10A is an

extremely high-power, high-performance

loudspeaker system designed for large-scale

music reinforcement and public address

applications.

The MSL-10A System comprises an all-

horn, integral full-range loudspeaker

cabinet constructed as a 30-degree

arrayable section, and a 19" electronics

rack (on wheels) housing the M-10A

Control Electronics Unit, three MS 10

Power Amplifiers and an Interface Unit.

The minimum standard MSL-10A

configuration comprises two loudspeaker

cabinets, each with its own electronics

rack. Additional MSL-10A cabinets may be

employed as modular 30-degree building

blocks to increase the coverage and

acoustical power of the system, providing

extensive flexibility to meet specific

application requirements.

Features

Extremely High Power

Exceptional Clarity

Point Source Arraying

Weatherproof Hardware

Long-Term Reliability

Applications

Paging and Announcing

Outdoor Sports Arenas

Stadiums

Racetracks

Large-Scale Touring

Concert Reinforcement

MSL-10A Loudspeaker

Fork lift brackets

(top & bottom)

High frequency

horns

Low frequency

horns

Reflex port and

enclosure

ventilation

Front View

High frequency

driver service

access

Speaker

connector

Serial number

plate

Low frequency

driver service

access

Rigging

points

Hatch handle

Environmental power

indicator

Environmental power

connector

Environmental circuit

breaker

Rear View

Enclosure Features:

• High Q maximizes

reverberation control

• Modular, arrayable design

for predictable, coherent

coverage

• High acoustical output

with low distortion

• Rugged construction

• Internal environmental

heating/cooling system

• Extensive weatherproofing

for long-term reliability

• Stainless steel hardware

throughout

• Rigged for transportation

and installation

Acoustical System1

Frequency Response2

Maximum SPL at 100 feet

Continuous

Peak

HF Coverage, -6 dB points

Horizontal

Vertical

MSL-10A Loudspeaker (one 30° section)

Driver Complement

HF DC Protection

Enclosure

Finish

Protective Grill

Rigging

Dimensions

Weight

Power Requirement

Connectors

Notes:

1. Acoustical specifications

are given for the minimum

configuration of two 30°

sections.

2. Measured 100 feet on axis,

half-space conditions,

pink noise input, in third-

octave bands.

70 Hz - 16 kHz ±4 dB

110 dB

120 dB

60 degrees

40 degrees

(4) MS-12 12-inch cone drivers

(3) MS-2001 2-inch horn drivers

50 µf polypropylene capacitor

Vented, horn-loaded, 12-ply hardwood

Weatherproof black coating

Three-piece expanded metal screen, damped

Eight points, 3/4 inch rigging holes in steel cradle

41" W x 85" H x 35" D

700 lbs (318 kg)

200–240 VAC, 3A (heater and fan supply)

Pyle with weather cap, heavy-duty AC in, weather

protected

The MSL-10A Loudspeaker cabinet is

fortified for long-term reliability in outdoor

installations, and is thoroughly inspected at

several stages during assembly. Con-

structed of high-grade Finnish birch

hardwood, the enclosure is resin-impreg-

nated in critical areas, bonded with

structural epoxy adhesive, and coated with

a finish that tolerates cabinet swelling

without cracking. Thermostatically-

controlled environmental heating and

cooling systems, which receive power from

the MSL-10A Rack, ventilate the cabinet

and stabilize its interior temperature.

The MSL-10A cabinet is internally

damped and braced for maximum energy

transfer and highly intelligible reproduc-

tion of voice and music — which is

especially important in acoustically difficult

environments. Internal and external steel

bracing and integral all-steel rigging points

ensure safe, efficient installation, and

integral forklift brackets ease handling.

Component Quality and Linearity

The MSL-10A Loudspeaker employs

driver components whose design, construc-

tion, and testing have been proven in over a

decade of demanding professional use. The

transducer magnetic circuits and suspen-

sions have been optimized for maximum

linearity, resulting in extremely low

harmonic distortion and consistent sonic

accuracy at all dynamic levels. Ferrofluid

cooling and back-vented gaps and pole

pieces maximize power handling, and

water-resistant treatment of all driver

elements ensures greatest reliability in

outdoor installations. Gold-plated contacts

and stainless steel mounting hardware

resist corrosion.

Rigorous Testing

The M-10A Control Electronics and

MSL-10A Loudspeaker components are

individually and fully tested at several

stages of manufacture to ensure maximum

reliability and minimum component

failure.

Each driver is subject to an eight-hour

dynamic burn-in to test for power handling

and peak excursion performance, and

thorough computer-based testing prior to

shipment ensures optimal system operation

upon installation.

Finally, the MSL-10A System has

undergone years of field testing in stadium

installations and touring reinforcement,

resulting in a mature, refined technology

that offers unmatched performance.

Arraying and Rigging

The MSL-10A loudspeaker is

designed to function as a modular

building block capable of being

arrayed in multiples to satisfy a wide

range of acoustical power and

coverage requirements.

Configured as a tightly controlled

30-degree section, the MSL-10A

cabinet features a trapezoidal con-

struction which forms curved arrays.

MSL-10A’s in an array combine

acoustically in a seamless fashion to

form a radiating arc, producing

uniform, coherent wavefronts over

the angle subtended by the array.

The propagation characteristic of

an MSL-10A array thereby closely

approximates that of a theoretically

perfect pulsating gas sphere — but

rather than being omnidirectional,

the radiation is confined to an area

that is controlled by the array con-

figuration. This yields exceptional

intelligibility in reverberant environ-

ments, with substantially the same

sonic character in both the near and

far field – a critical advantage in large-

scale sound reinforcement.

To expedite arraying and installa-

tion, the MSL-10A is fitted with an

integral rigging system. Comprising

steel braces on the cabinet sides and

convenient fork lift feet on top and

bottom, the rigging system eases

handling and provides secure points

from which to suspend the cabinet. In

A Two-Section Array Showing Locations

of Hanging Points

Do Not Lift

or Hang by

Upper Fork

Lift Feet

Rig From Spacer/Hanger Bar

Installation of Spacer/One-Piece

Hanger Bar

Spacer/Hanger Bar

Left: Top View

Right: Side View

Three-Section Array

40° Vertical Coverage

90° Horizontal Coverage

conjunction with an accessory spacer/

hanger bar, it also facilitates coupling

adjacent cabinets to form rigid arrays.

Wide Horizontal Arrays

The minimum MSL-10A configura-

tion is two cabinets (as shown below).

Coupled side-by-side, this configu-

ration delivers 60 degrees horizontal

coverage. Spacer/hanger bars and

case-hardened steel bolts join the

cabinets together and provide rigging

points for hoisting.

To increase the horizontal cover-

age of the array, one or more cabinets

may be added as shown in the

illustration above. Each cabinet added

to the array extends its horizontal

coverage by 30 degrees while main-

taining a consistent 40 degrees of

vertical coverage.

Long-Throw Configuration

20° Vertical Coverage

60° Horizontal Coverage

Ring Configuration

360° Horizontal Coverage

113"

(approx.) 80.25" radius

(approx.)

Use of Spacer/Hanger Bar to Couple

Cabinets Vertically

Spacer/

Hanger

Bar

Long-Throw Arrays

To increase the effective throw of

the system, MSL-10A cabinets may be

arrayed one atop another with high

horns together, as shown in the

illustration at the right. Spacer/

hanger bars are used to couple the

cabinets both horizontally and

vertically, as illustrated at the left. A

second set of spacer/hanger bars at

the top provides convenient points for

hoisting and hanging the array.

In this configuration, coupling

between the adjacent horns narrows

the vertical dispersion of the array to

±10 degrees, moving the focal point

(or virtual source) farther behind the

array. Since inverse-square propaga-

tion losses depend upon the distance

from the focal point (rather than from

the array surface), this configuration

maintains high sound pressures over

very long distances.

The effect is analogous to the

difference between a floodlight and a

searchlight. The floodlight distributes

energy very widely, as though from a

proximate point source, and its

intensity decreases relatively quickly

with increased distance. The search-

light, on the other hand, projects a

narrow, focused beam which is the

equivalent of colimated light from a

distant, very powerful point source.

Its intensity therefore decreases much

more slowly with increased distance.

Ring Configuration

As shown at left, twelve MSL-10A

cabinets arrayed horizontally form a

complete ring providing 360-degree

horizontal coverage.

This system produces prodigious

sound pressures in a reasonably

compact package (80.25" radius), and

is effective for large scale concerts in-

the-round or sporting events in very

large stadiums. Where required,

additional cabinets may be added

vertically, as shown above, to increase

the throw for any portion(s) of the

total arc.

MSL-10A Rack System

M-10A Control

Electronics Unit

High Amplifier

50A Power Switch/

Circuit Breaker

Low Amplifier 1

Low Amplifier 2

MS 10 Power

Amplifiers

Notes:

1. Cycle consisting of

50 msec sinewave at 120 V

peak and 450 msec

sinewave at 24 V peak

2. Cycle consisting of

25 msec sinewave at 120 V

peak and 975 msec

sinewave at 41 V peak

3. Cycle consisting of

400 msec sinewave at

120 V peak and 2400 msec

interval at 0 V

I/O Panel

Power Indicator

Rack System Features:

• Integrated signal process-

ing includes optimized

active crossover, ampli-

tude and phase correc-

tion, and driver protection

circuitry to maintain safe

operating levels

• Modular amplifier rack

includes control electron-

ics, amplifiers and

interconnection panel for

easy interface with

speaker system

• Input/Output unit provides

power switch and circuit

breaker for entire system;

protection and power

distribution to the CEU,

amplifiers, and loud-

speaker; and loudspeaker

and external power

connections

• Completely engineered

and ready to install

Mains Power Cable

Environmental Power Cable

Loudspeaker Cable

M-10A Control Electronics Unit

(3) MS 10 Power Amplifiers

I/O Panel

24" W x 36 1/4" H x 27 3/4" D

10 ga. 6 cond., Pyle ZPEK 1620 both ends

16 ga. 3 cond., NEMA L6-15R both ends

8 ga. 3 cond., Hubbell CS-8264-C to bare leads

Bridge mode, single balanced input

16 dB

1800 watts

1100 watts

367 watts

In bridged mode, 4 ohm resistive load, will

reproduce three specified burst waveforms1,2,3,

each continuously for 1 hour, without shutdown or

limiting

In bridged mode, 8 ohm resistive load, passes the

FTC continuous power test

In bridged mode, 4 ohm resistive load, will

reproduce a 400 msec sinewave burst at 225

watts, 2.8 sec burst interval, continuously for

1 hour without shutdown or limiting

Latch-up protection

Indicators for clipping, limiting, thermal overload

MSL-10A Rack System (each section)

Component Complement

Dimensions

Interconnects

100' Speaker Cable

100' Environmental AC Cable

30' Mains Power Cord

MS 10 Power Amplifier

Configuration

Voltage Gain

Power Output

0.5 sec burst @ 4 ohms

FTC Rating @ 8 ohms

Continuous @ 8 ohms

Nominal (235 VAC) Mains Operation

High (255 VAC) Mains Operation

Low (200 VAC) Mains Operation

General

Loop Output

Signal Input

Active balanced, 10k ohms, ISO™ Input

Active push-pull, 600 ohm drive

+20 dBv

+26 dBv

-90 dBv (“A” weighted)

120 dB

800 Hz

RMS, peak and excursion limiters

RMS, peak and excursion limiters

Peak limiter

Power/Ready LED

High and Low Sense LED’s

VHF, HF and LF Limit LED’s

Safe LED

Standby/On switch

VHF Cal/Music switch

Safe/AutoSafe switch

Input Attenuation (calibrated in dB)

3-pin XLR-type female, front panel mounted

3-pin XLR-type male, front panel mounted

3-pin XLR-type male, rear panel mounted

Dual banana receptacles, rear panel mounted

M-10A Control Electronics Unit

Input Type

Output Type

Maximum Input/Output Level

Unbalanced

Balanced

Hum and Noise

Dynamic Range

Electronic Crossover Frequency

Driver Protection Circuits

Low Frequency

High Frequency

VHF

Indicators

Controls

Connectors

Input

Loop Out

Hi and Lo Output

Sense

Power Requirement

Mains AC Voltage Source

Maximum Power Consumption

Maximum Continuous RMS Current1

Peak Instantaneous Operating Current2

Peak Inrush (Turn-On) Current3

Cold

Hot

Idle Current4

200 – 260 VAC, 50 A, 50/60 Hz

8700 VA

38 A rms (Power factor ≈ .93 lagging)

94 A peak

240 A peak

360 A peak

9 A rms

Notes:

1. Current waveform is non-

sinusoidal, so the RMS

current rating applies only

to power consumption

and heating from the

source. The peak current

rating must be considered

when determining I2R

losses in power cable.

Peak losses will lower the

internal power supply

voltages linearly.

2. One AC cycle.

3. Inrush current due to

magnetization, <40 ms ␣␣␣

(2 cycles).

4. Environmental heaters on.

AC Interfacing and Protection

The MSL-10A Rack System requires a

single-phase AC voltage source wired

between the øX and øY terminals of the

Rack System AC inlet, with earth ground as

a chassis safety connection. It may be

interfaced to virtually any delta or wye

source configuration, with the Rack øX and

øY connected to any two source terminals

that yield 200~260 VAC; multiple racks

may be connected to different phases of a

polyphase source to distribute the load. The

maximum safe isolation voltage between

øX or øY and earth is 480 VAC.

The AC inlet is protected with a 50 A,

250 V switch-type magnetic circuit breaker

which is CSA, VDE and UL approved (UL

Code “A”) and is located on the front of the

I/O Panel. Power distribution to each

amplifier is individually protected with a

two-pole, 20 A, 250 V switch-type breaker

located on the rear panel. The environmen-

tal power and M-10A CEU share a single 20

A, 250 V breaker, also located on the rear

panel.

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.

© 1990 Meyer Sound 04.110.099.01B

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, comprehensive

testing in the laboratories.

Research remains an integral,

driving force behind all production.

Meyer strives for sound quality that

is predictable and neutral over an

extended lifetime and across an

extended range.