Rated Output Power:
250 watts rms
Total Harmonic Distortion:
Less than 0.5%, 20 - 20,000 Hz
Frequency Response:
±
1
dB, 20 - 20,000 Hz at full rated output
Input Sensitivity:
High impedance, 500mV; Low impedance balanced, with optional
transformer,
1
50mV
Hum and Noise:
90dB below rated output
Output Loads:
4 ohms, 8 ohms, 25VCT (2.5 ohms), 70V (20 ohms)
Output Regulation:
Better than 2 dB from no load to full load
Input Impedances:
Hi-Z, 50,000 ohms unbalanced; Lo-Z, 600 ohms, balanced or
unbalanced, and
1
:
1
bridging with optional plug-in transformers
Low-Cut Filter:
-
1
0 dB @
1
00 Hz
Controls & Indicators:
Front panel illuminated power and shutdown LED indicators
Rear Panel Input level control, Slo-Blo fuse
Internal Low-Cut filter switch
Power Requirements:
1
20V AC, 60 Hz, 520 watts @ Full Rated Output (Idle, 60W)
Overload Protection:
Electronic overload protection
Electrical 7A Slo-Blo Fuse
Thermal
1
05° C (220° F) Thermostat
Operating Temperature Range:
-20°C (-4°F) to +49°C (+
1
20°F) at rated output
Auxiliary Receptacle (not switched):
Three-wire grounded*, 300 watts maximum
Dimensions (without removable feet):
1
9" W x
11
" D x 5-
1
/4" H (48.3 x 27.9 x
1
3.3 cm)
Finish:
Black
Weight:
50 lb. (22.7 kg)
Accessories:
Model TL600, line-matching transformer; Model TL
1
00,
1
:
1
line-matching transformer
*This receptacle will be grounded only if the power amplifier has been grounded properly.
Technical
Specifications
The power amplifier shall be a Bogen Model HTA250A
or approved equivalent using power MOSFET circuitry.
The amplifier shall deliver an audio output of 250 watts
(rms continuous). Total harmonic distortion shall be
less than 0.5% at the 250-watt rating over the frequen-
cy range of 20 to 20,000 Hz.The rated output shall be
obtained with an input that is not greater than 500mV
(rms). Hum and noise shall be at least 90 dB below
rated output. The frequency response, when measured
at full rated output, shall be flat within ±
1
dB, 20 to
20,000 Hz.
The amplifier shall provide either balanced or unbal-
anced constant-voltage outputs of 25 VCT and 70 volts,
plus 4 and 8 ohm balanced or unbalanced outputs.
Output regulation shall be within 2dB from no load to
full load.
The amplifier shall provide an input of 50,000 ohms
unbalanced high impedance, or 600 ohms balanced or
unbalanced low impedance, or line bridging with
optional accessory plug-in transformers. Overall gain
shall be adjustable by means of a single level control
located on the rear panel. An internal low-cut filter
(-
1
0dB @
1
00Hz) shall also be provided. The front of
the amplifier shall contain an illuminated on/off power
switch. The amplifier shall incorporate electronic shut-
down circuitry which shall activate whenever an over-
load or short occurs on the output of the amplifier. A
front panel overload shutdown LED shall illuminate to
indicate the discontinuance of power output; the cir-
cuitry shall automatically restore power output once
the cause of the shutdown condition has been
removed.
The amplifier shall operate from a
1
20 VAC, 60 Hz
source and shall consume 60 watts or less at idle and
520 watts at full rated output. The amplifier shall have
thermostatic control to prevent operation at excessive
ambient temperatures. The amplifier also shall include
electronic overload limiting, short-circuit protection
and a 7-amp Slo-Blo fuse.
The amplifier shall have a standard EIA
1
9-inch front
panel suitable for rack mounting.The amplifier shall be
1
9" wide, 5-
1
/4" high and
11
" deep, finished in black
and shall weigh 50 lb.
Architect
and Engineer
Specifications
50 Spring Street, Ramsey, New Jersey 07446, U.S.A.
20
1
-934-8500 • Fax: 20
1
-934-9832 • www.bogen.com
