The Bogen HTA250A Power Amplifier is a high-
performance unit employing Power MOSFET
technology. The unique characteristics of Power
MOSFETS make them ideally suited to power
amplifier design, providing far superior perfor-
mance and reliability compared to other types of
transistors. They offer higher efficiency, reduced
heat, simpler overall design, reduced size and
weight.
The Model HTA250A supplies 250 watts (rms
continuous output) at less than 0.5% total har-
monic distortion from 20 to 20,000 Hz. An input
signal of only 500mV is required for full rated out-
put. The input impedances are: high-impedance
(50,000 ohms) unbalanced; low impedance
(500/600 ohms, balanced or unbalanced) with
optional accessory transformer Model TL600. Line
bridging can be achieved with optional trans-
former Model TL
1
00. Residual hum and noise is at
least 90 dB below rated output and the output
regulation is better than 2 dB from no load to full
load.
The HTA250A can drive a variety of load imped-
ances. Outputs include 4 ohms, 8 ohms, 25VCT
and 70 volts.The amplifier is capable of safely dri-
ving any recommended load continuously. The
HTA250A is thermally protected to prevent dam-
age due to excessively high temperatures; howev-
er, the amplifier will deliver the full rated output
continuously, even at +49°C (+
1
20°F). Additional
failure-preventive devices include overload limit-
ing, short circuit protection, and a Slo-Blo fuse.
Electronic shutdown circuitry is automatically
activated if an overload or short occurs and a
front panel overload shutdown LED illuminates.
Once the cause has been rectified, the unit auto-
matically resets. The power on/off switch, located
on the front panel, illuminates when power is on.
The rear panel contains an input level control,
input and output connections, the AC line fuse,
and an auxiliary receptacle. A low-cut filter switch
is located internally.
Power Amplifier
Model HTA250A
• Power MOSFET circuitry
• Capable of continuous operation at rated output power
• Frequency response ±
1
dB, 20 - 20,000 Hz at full rated output
• Distortion less than 0.5% THD, 20 - 20,000 Hz
• Multiple output voltages/impedances available
• Automatic overload protection
• UL listed
Features
Description
Specifications subject to change without notice.
© 1998 Bogen Communications, Inc.
Part No. 54-7773-06B Printed in U.S.A. 05
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