Power Rating (RMS):
250 watts
Frequency Response
Transformer Output:
65 Hz to 20 kHz, +0/-2dB @ -2 dB
Direct:
20 Hz to 20 kHz, +0/-
1
dB @ rated power
Distortion
Direct:
0.5% (max.), 0.3% (typ.), 20 Hz to 20 kHz
Transformer:
0.5% (max.), 0.3% (typ.), 65 Hz to 20 kHz @ -2 dB
Signal-to-Noise Ratio:
Fundamental: -94 dB or better; AUX
1
& 2: -70 dB; TEL: -70 dB or better @ 600 ohms;
MIC
1
– 6: -60 dB or better @ 200 ohms
Inputs/Outputs
:
6 MIC: Lo-Z balanced via 4 XLR connectors and 2 screw terminals;
Sensitivity: 0.35mV (200 ohms)
2 AUX: Hi-Z RCA jacks; Sensitivity: 0.085V (
1
0k ohms)
Telephone: Screw terminals; Sensitivity: 0.07V (600 ohms)
Output to Power Amp: 5V @ Rated Output via RCA jack
Power In/Pre Out: In
1
V/Out
1
V via RCA jacks
WMT
1
A Output: 25V @ Rated Output via RCA jack
Tape Output: 687mV @ Rated Output via RCA jack
Output Impedance:
All models: balanced or unbalanced 8-ohm, 25V, 25VCT, 70V, 4-ohm direct
Output Regulation:
Better than 2 dB from no load to full load
Variable Mute Range
:
4 steps: -60, -2
1
, -
1
0, 0 dB (Aux
1
& 2)
ALC
:
Distortion: less than 0.5%; Compression: 25 dB
VOX Threshold:
Tel Input: 20mV (VOX control max. CW position)
MIC Precedence:
Via terminal strip. -60 dB: MIC
1
, 2, 3, 5/TEL 6/AUX
1
, AUX 2
Pre-amp Out/Power Amp In:
In:
1
V; Out:
1
V
Loudness Contour:
+8 dB @
1
00 Hz, +4 dB @
1
0 kHz (AUX
1
& 2 control at
1
/4 CW position)
Aphex Aural Exciter:
Type A9
Overload Protection:
Electronic with automatic reset
Thermal Protection:
1
05°C (220°F) thermistor attached to heat sink
Line Fusing:
7A/
1
25V AC Slo-Blo
Power Consumption:
480 watts,
1
20V AC, 60 Hz
Dimensions:
1
6-
1
/2" W x 3-
1
/2" H x
1
2" D
Shipping Weight:
33 lb.
Technical
Specifications
The amplifier shall be a model GS250, rated at 250 watts
RMS, with three-speed fan cooling.
The amplifier shall accommodate up to 6 Lo-Z balanced
microphones, 2 Hi-Z auxiliary sources and a telephone
paging input (MIC 5 shall be switch-selected for mic or
telephone line; MIC 6 switch-selected for microphone or
AUX
1
). MIC
1
through 4 shall use XLR-type connectors;
AUX input shall be via RCA phono jacks and all other con-
nectors shall use screw terminals. Phantom power shall be
supplied for use with condenser microphones.
Microphone precedence connections shall be included for
MIC
1
, 2, 3, 5/TEL, 6/AUX
1
, and AUX 2.
The amplifier shall provide a frequency response from 20
Hz to 20 kHz +0/-
1
dB at rated power. Distortion shall be
0.3% typically, from 20 Hz to 20 kHz direct at rated power,
and from 65 Hz to 20 kHz transformer @ -2 dB.
The amplifier shall include an Aphex Aural Exciter circuit,
variable loudness contour control and dual-function equal-
izer. The equalizer shall be switch-selectable for feedback
control or acoustic shaping and shall include
1
0 center-
detent slide controls providing ±
1
2 dB of boost or cut
from 62.5 Hz to
1
6 kHz in acoustic mode and from
1
25
Hz to 8 kHz in feedback control mode.
The amplifier’s TEL input shall include automatic level con-
trol to provide consistent output regardless of who is pag-
ing, and a four-step VOX-activated AUX mute level.
Provisions shall also be included for remote volume con-
trol, using an accessory control unit.
Outputs shall be provided for 4- and 8-ohm speakers and
for 25V, 25VCT, and 70V distributed systems. Additional
outputs shall be provided to feed a booster amp and tape
recorder. A dedicated output shall permit feeding a 600-
ohm telephone line using an accessory transformer (Model
WMT
1
A). A Pre-amp out/power amp in circuit shall be
provided to insert signal processing equipment.
The amplifier shall be rack mountable using an accessory
rack panel kit. It shall be UL and CSA listed.
Architect
and Engineer
Specifications
50 Spring Street, Ramsey, New Jersey 07446, U.S.A.
Tel. 20
1
-934-8500; FAX: 20
1
-934-9832; www.bogen.com
