Meyer Sound Usm 1 Users Manual

USM-1 to the manual 3416a870-1add-423a-b395-522eea921c91

: Meyer-Sound Meyer-Sound-Usm-1-Users-Manual-555602 meyer-sound-usm-1-users-manual-555602 meyer-sound pdf

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Features
High gain-before-feedback
Wide horizontal coverage
Flat frequency response

USM-1

Rugged and reliable

High Power
Stage Monitor
Applications
Stage monitoring
Live music clubs
Touring reinforcement

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9

6

3

0

Inches

The USM-1 is a high-powered, widecoverage loudspeaker for professional
stage monitoring applications. Specifically designed for touring reinforcement, 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 exceptional efficiency and power handling,
with low distortion for maximum clarity. 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, optionally, aircraft-style rigging pan fittings.
The USM-1 requires a high-quality
professional stereo power amplifiercapable of delivering up to 600 watts per
channel continuously into 8 ohms, with
a signal voltage gain of 10␣dB (minimum) to 30␣dB (maximum).

Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
(510) 486-1166
FAX (510) 486-8356

USM-1 Specifications

Acoustical – USM-1/S-1 System
Frequency Response 1
Maximum SPL2
Continuous
Peak
Maximum Peak (Music Signal)
HF Coverage, -6dB points
Acoustical Crossover Frequency
USM-1 Loudspeaker
Transducers
Low Frequency
High Frequency
High Frequency Horn
HF Network
Enclosure
Finish
Protective Grill
Connector
Rigging (optional)
Physical Dimensions
Weight
S-1 Control Electronics Unit
Input Type 3
Output Type
Maximum Input/Output Level
Balanced
Unbalanced
Hum and Noise 4
Dynamic Range
Sense Inputs
Low-Frequency Delay Type
Driver Protection Circuitry
Low Frequency
High Frequency
Indicators
Sense/Gain Detect, Hi and Lo
Limit, Hi, Lo, and VHF
Safe
Power Supply
Controls
Front Panel
Preset Panel
Connectors
Balanced Inputs/Outputs
Sense Inputs
Power
Physical Dimensions
Weight

40-18k Hz +4 dB
130 dB
139 dB
144 dB
70° horizontal x 60° vertical
900 Hz

MS-15 15-inch cone driver, 12 ohms
MS-2001A 2-inch throat compression driver, 8 ohms
70 degree modified radial
DC blocking capacitor
2.3 cu. ft. vented, multi-ply Finnish birch
Black textured
Hex perforated metal, powder coated, charcoalgrey foam covering
EP-4 male, EP-5 male (Europe only)
Aircraft pan fittings or 3⁄8"-16 or M10 x 1.5 nut plates
21" W x 241⁄4" H x 181⁄4" D
82 lbs. (37.3 kg)

Active balanced ISO™ input, 10k ohms, 5k ohms per leg
Active push-pull, will drive 600 ohms
+26 dBu
+20 dBu
-90 dBV
>110 dB
100k ohms true differential
Active all-pass
RMS limiter and excursion limiter
RMS limiter and excursion limiter
VHF Peak limiter
Green/Red LEDs
Red LEDs
Green LED
Green/Red LED
Input attenuator, AC power switch
Lo Cut switch, Safe switch, VHF switch, VHF control
3-pin XLR (A-3)
Banana jacks
90-105/180-250 VAC, 50/60 Hz (rear-panel switchable)
19" W x 13⁄4" H x 7 3⁄4" D standard rack mount
8 lbs. (3.6 kg)

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 accommodate 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

-

8

VHF
Hi

Power
UltraSeries™ S-1

Var

Safe
VHF

Cal
Sense

Adj

Limit

The USM-1 operates as a system with the
S-1 Control Electronics Unit (one per channel). 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 protection.
SpeakerSense driver protection circuitry
protects the USM-1 loudspeaker components from damage due to overheating or
excessive excursion under high power conditions. This unique circuit continuously
monitors the power applied to the USM-1
drivers, and individually limits the highfrequency 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 incorporates Meyer Sound’s new MultiSense™
function, which allows the use of multiple

4

20
Safe

Lo

6 5

10

Lo Cut

power amplifiers having different channel
gains and/or power ratings. The S-1 accommodates 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 output 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 fullpower conditions. This has the effect of discriminating 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 anticipated. The Safe switch and other setup controls are located behind a cover plate on the
S-1 front panel, providing a means of securing the system installer’s presets.

∞

0
Attn dB

3
2
1

Architectural and
Engineering Specifications

Meyer Sound Laboratories has

USM-1/S-1

devoted itself to designing,
manufacturing, and refining components that deliver superb sonic

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 highfrequency horn which has a 2.0" throat and
4" diameter diaphragm with gap field of
strength of 19k Gauss, and a separate Control Electronics Unit.
The Control Electronics Unit shall contain 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 lowfrequency speaker; low- and high-frequency
protection filters which automatically activate under high power conditions;
RMS, peak and excursion limiters to protect the speaker components; equalization
circuitry; active balanced input; and indicator LEDs for power 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
+26 dBu.

The speaker system, its companion
Control Electronics Unit, and a power
amplifier rated at 600 watts/channel into
8␣ohms shall meet the following performance criteria: frequency response, 40 Hz to
18 kHz plus or minus 4 dB measured with
1 rd
/3 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 distribution pattern, 70 degrees horizontal by
60 degrees vertical.
Speaker enclosure dimensions are
21" W x 241⁄4" H x 181⁄4" D, weight 82 lbs
(37.3 kg).
Control Electronics Unit dimensions are
19" W x 13⁄4" H 73⁄4" 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.

Physical Dimensions

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.

2.00
(GRILL FRAME
W/FOAM)
20.25
18.25
13.00

2.62

7.25

10.50
24.25

±.13
10.13 CG

21.04

7.00

45°
2.62
6.50

±.13

21.00

31.47
3.50
2..25

2..25

Sound
engineering
for the art
and science
of sound.

9.50

Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
(510) 486-1166
FAX (510) 486-8356
©1994 Meyer Sound

04.151.014.01 B2



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