Meyer Sound USM-1 Manuale utente

USM-1

Features

High gain-before-feedback

Wide horizontal coverage

Flat frequency response

Rugged and reliable

Applications

Stage monitoring

Live music clubs

Touring reinforcement

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Inches

The USM-1 is a high-powered, wide-

coverage loudspeaker for professional

stage monitoring applications. Specifi-

cally designed for touring reinforce-

ment, the accurate, rugged USM-1 is

a biamplified system consisting of a

proprietary 15-inch low-frequency driver

in a vented enclosure, and a 70-degree

high-frequency horn with 2-inch (throat

diameter) driver.

The USM-1’s drivers provide excep-

tional efficiency and power handling,

with low distortion for maximum clar-

ity. Its very flat frequency response

allows control of feedback at high

stage levels.

The sturdy, multi-ply hardwood

enclosure with textured finish is

designed to withstand road abuse. The

USM-1 comes with handles and, option-

ally, aircraft-style rigging pan fittings.

The USM-1 requires a high-quality

professional stereo power amplifierca-

pable of delivering up to 600 watts per

channel continuously into 8 ohms, with

a signal voltage gain of 10␣dB (mini-

mum) to 30␣dB (maximum).

Meyer Sound Laboratories, Inc.

2832 San Pablo Avenue

Berkeley, CA 94702

(510) 486-1166

FAX (510) 486-8356

High Power

Stage Monitor

Acoustical – USM-1/S-1 System

Frequency Response

40-18k Hz +4 dB

Maximum SPL

Continuous 130 dB

Peak 139 dB

Maximum Peak (Music Signal) 144 dB

HF Coverage, -6dB points 70°horizontal x 60°vertical

Acoustical Crossover Frequency 900 Hz

USM-1 Loudspeaker

Transducers

Low Frequency MS-15 15-inch cone driver, 12 ohms

High Frequency MS-2001A 2-inch throat compression driver, 8 ohms

High Frequency Horn 70 degree modified radial

HF Network DC blocking capacitor

Enclosure 2.3 cu. ft. vented, multi-ply Finnish birch

Finish Black textured

Protective Grill Hex perforated metal, powder coated, charcoal-

grey foam covering

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

Rigging (optional) Aircraft pan fittings or

⁄8"-16 or M10 x 1.5 nut plates

Physical Dimensions 21" W x 24

⁄4" H x 18

⁄4" D

Weight 82 lbs. (37.3 kg)

S-1 Control Electronics Unit

Input Type

Active balanced ISO™ input, 10k ohms, 5k ohms per leg

Output Type Active push-pull, will drive 600 ohms

Maximum Input/Output Level

Balanced +26 dBu

Unbalanced +20 dBu

Hum and Noise

-90 dBV

Dynamic Range >110 dB

Sense Inputs 100k ohms true differential

Low-Frequency Delay Type Active all-pass

Driver Protection Circuitry

Low Frequency RMS limiter and excursion limiter

High Frequency RMS limiter and excursion limiter

VHF Peak limiter

Indicators

Sense/Gain Detect, Hi and Lo Green/Red LEDs

Limit, Hi, Lo, and VHF Red LEDs

Safe Green LED

Power Supply Green/Red LED

Controls

Front Panel Input attenuator, AC power switch

Preset Panel Lo Cut switch, Safe switch, VHF switch, VHF control

Connectors

Balanced Inputs/Outputs 3-pin XLR (A-3)

Sense Inputs Banana jacks

Power 90-105/180-250 VAC, 50/60 Hz (rear-panel switchable)

Physical Dimensions 19" W x 1

⁄4" H x 7

⁄4" D standard rack mount

Weight 8 lbs. (3.6 kg)

USM-1 Specifications

Note 1:

Measured 1 meter on-axis to

high horn, half-space con–

ditions, pink noise input, in

third-octave bands.

Note 2:

Loudspeaker driven with “A”

weighted noise (peak-to-RMS

ratio

≈

12 dB), with amplifier

rated at 600 W/channel at

8␣ohms. The USM-1 will accom-

modate amplifiers capable of

output levels up to

140 vpk.

Note 3:

ISO™ input: Pins 1, 2 and 3 are

transformer isolated, shell is

connected to chassis/AC

mains ground.

Note 4:

“A”- weighted, unbalanced.

The S-1 Control

Electronics Unit

The USM-1 operates as a system with the

S-1 Control Electronics Unit (one per chan-

nel). A single-channel device operating at

line level, the S-1 is the final component in

the signal chain before the amplifier.

Optimized for the USM-1 loudspeaker

and pre-aligned at the factory, the S-1

contains frequency and phase response

alignment circuitry, and Meyer Sound’s

exclusive SpeakerSense

™

driver protection

circuitry, incorporating both peak and RMS

signal limiting as well as excursion protec-

tion.

SpeakerSense driver protection circuitry

protects the USM-1 loudspeaker compo-

nents from damage due to overheating or

excessive excursion under high power con-

ditions. This unique circuit continuously

monitors the power applied to the USM-1

drivers, and individually limits the high-

frequency and low-frequency outputs when

the safe operating limits of the drivers are

exceeded. Until the onset of overload, the

SpeakerSense circuitry has no effect on the

signal.

The S-1 SpeakerSense circuit incorpo-

rates Meyer Sound’s new MultiSense™

function, which allows the use of multiple

power amplifiers having different channel

gains and/or power ratings. The S-1 accom-

modates two stereo power amplifiers, and

provides separate Sense inputs for each. Its

MultiSense circuit, which implements an

analog OR condition, automatically tracks

the power amplifier with the greatest out-

put voltage swing to control the system

protection limiters.

To enhance the effectiveness of the

USM-1 in stage monitoring applications,

the S-1 incorporates sliding filters which

band-limit the system response under full-

power conditions. This has the effect of dis-

criminating for vocal information in the

signal to increase clarity.

Also provided is a switch-selectable Safe

function, which widens the safety margin of

the system and is intended to be used when

extended periods of overload are antici-

pated. The Safe switch and other setup con-

trols are located behind a cover plate on the

S-1 front panel, providing a means of se-

curing the system installer’s presets.

UltraSeries™ S-1 Power

Sense Limit

Safe

Adj

Lo Cut

Cal

VHF

Var

Safe

∞

10 843

Attn dB

VHF

Architectural and

Engineering Specifications USM-1/S-1

The speaker system, its companion

Control Electronics Unit, and a power

amplifier rated at 600 watts/channel into

8␣ohms shall meet the following perform-

ance criteria: frequency response, 40 Hz to

18 kHz plus or minus 4 dB measured with

octave pink noise at 1 meter on axis;

output of 130 dB SPL one meter on axis

with peaks of 139 dB SPL when driven with

“A”-weighted noise. High frequency dis-

tribution pattern, 70 degrees horizontal by

60 degrees vertical.

Speaker enclosure dimensions are

21" W x 24

⁄

" H x 18

⁄

" D, weight 82 lbs

(37.3 kg).

Control Electronics Unit dimensions are

19" W x 1

⁄

" H 7

⁄

" D, weight 8 lbs (3.6␣kg).

The speaker system shall be the Meyer

Sound USM-1.

The Control Electronics Unit shall be

the Meyer Sound S-1.

The compact speaker system shall be of

the two-way type, with a 15" low-frequency

loudspeaker front-mounted in a ducted

bass-reflex hardwood plywood enclosure,

a compression driver mounted on a high-

frequency horn which has a 2.0" throat and

4" diameter diaphragm with gap field of

strength of 19k Gauss, and a separate Con-

trol Electronics Unit.

The Control Electronics Unit shall con-

tain a power supply capable of operating

from a 90-125/180-250 VAC, 50/60 Hz line;

electronic crossover circuitry; electronic

delay for the phase alignment of the low-

frequency speaker; low- and high-frequency

protection filters which automatically acti-

vate under high power conditions;

RMS, peak and excursion limiters to pro-

tect the speaker components; equalization

circuitry; active balanced input; and indica-

tor LEDs for power and limiters. Total har-

monic distortion shall be less than 0.1%.

“A”- weighted noise level shall be at least

110 dB below maximum rated output of

+26 dBu.

Sound

engineering

for the art

and science

of sound.

Meyer Sound Laboratories, Inc.

2832 San Pablo Avenue

Berkeley, CA 94702

(510) 486-1166

FAX (510) 486-8356

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.

Physical Dimensions

10.50

24.25

21.00

±.13

10.13 CG

7.25

21.04

31.47

45°

7.00

2.62

6.50 ±.13

3.50

13.00

18.25

20.25

2.00

(GRILL FRAME

W/FOAM)

2.62

2..25

9.50

2..25

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