Acoustical – USM-1/S-1 System
Frequency Response
1
40-18k Hz +4 dB
Maximum SPL
2
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
3
⁄
8
"-16 or M10 x 1.5 nut plates
Physical Dimensions
21" W x 24
1
⁄
4
" H x 18
1
⁄
4
" D
Weight
82 lbs. (37.3 kg)
S-1 Control Electronics Unit
Input Type
3
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
4
-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
3
⁄
4
" H x 7
3
⁄
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.
