Data Sheet

Rated Output Power: HTA125A: 125W; HTA250A: 250W
Total Harmonic Distortion: Less than 0.5%, 20 to 20,000 Hz at full rated output
Frequency Response: ±1 dB, 20 to 20,000 Hz at full rated output
Input Sensitivity: Hi-Z, 500mV; Lo-Z balanced, with optional transformer,150mV
Hum and Noise: 90 dB below rated output
Output Loads: 4 ohms, 8 ohms, 25V, 25VCT, 70V
Output Regulation: Better than 2 dB from no load to full load
Input Impedances: Hi-Z, 50k ohms unbalanced; Lo-Z, 600 ohms, balanced or unbalanced,
and 1:1 bridging with optional plug-in transformers
Low-Cut Filter: -10 dB @ 100 Hz
Controls & Indicators: Front Panel — Illuminated On/Off power switch and overload shutdown LED
Rear Panel — Input level control, Slo-Blo fuse
Internal — Low-Cut filter switch
Power Requirements: HTA125A: 120V ~, 60 Hz, 3.1A, 260 watts @ Full Rated Output (Idle 45W)
HTA250A: 120V ~, 60 Hz, 5.5A, 520 watts @ Full Rated Output (Idle 60W)
Thermal Emissions (full power): HTA125A: 426.9 BTU/hr.; HTA250A: 939.2 BTU/hr
Overload Protection: Electronic overload protection
Electrical: HTA125A: 4A Slo-Blo Fuse; HTA250A: 7A Slo-Blo Fuse
Thermal: Thermostat
Auxiliary Receptacle (not switched): Three-wire grounded*, 300 watts maximum
Dimensions (without removable feet): 19" W x 5-1/4" H x 11" D (48.3 x 13.3 x 27.9 cm)
Front Panel Dimensions: 19" W x 5-1/4" H (48.3 x 13.3 cm)
Finish: Black
Product Weight: HTA125A: 36 lb. (16.3 kg); HTA250A: 50 lb. (22.7 kg)
Regulatory Approvals: Listed to UL Standard 60065 for US and Canada
Accessories: Model TL600, 600-ohm line-matching transformer; Model TL100,
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 HTA Series
Model or approved equivalent using power MOSFET
circuitry.
The amplifier shall deliver an audio output of 125 watts
(HTA125A) or 250 watts (HTA250A) (RMS continu-
ous). Total harmonic distortion shall be less than 0.5%
at the 125-watt or 250-watt rating over the frequency
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 ±1dB, 20 to
20,000 Hz.
The amplifiers shall provide either balanced or unbal-
anced constant-voltage outputs of 25V, 25 VCT, and
70V, plus 4- and 8-ohm balanced or unbalanced
outputs. Output regulation shall be within 2 dB from no
load to full load.
The amplifiers shall provide an input of 50k ohms unbal-
anced 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 (-10dB @
100Hz) shall also be provided. The front of the ampli-
fiers shall contain an illuminated ON/OFF power switch.
The amplifiers shall incorporate electronic shutdown
circuitry which shall activate whenever an overload or
short occurs on the output of the amplifiers. A front
panel overload shutdown LED shall illuminate to indi-
cate the discontinuance of power output; the circuitry
shall automatically restore power output once the cause
of the shutdown condition has been removed.
The amplifiers shall operate from a 120 VAC, 60 Hz
source. The HTA125A shall consume 45 watts or less at
idle and 260 watts at full rated power. The HTA250A
shall consume 60 watts or less at idle and 520 watts at
full rated output. The amplifiers shall have thermostatic
control to prevent operation at excessive ambient
temperatures. The amplifier also shall include electron-
ic overload limiting, short-circuit protection and a 4-amp
Slo-Blo fuse on the HTA125A or a 7-amp Slo-Blo fuse
on the HTA250A.
The amplifiers shall have a standard EIA 19-inch front
panel suitable for rack mounting. The amplifiers shall be
19" wide, 5-1/4" high and 11" deep, finished in black and
shall weigh 36 lb. (HTA125A) or 50 lb. (HTA250A).
Architect
and Engineer
Specifications
50 Spring Street, Ramsey, New Jersey 07446, U.S.A.
Tel.: [phone] • Fax: [phone]
www.bogen.com