Stereo Power Amplifier 2155

A 2 x 55 watt Stereo (125W Bridged Mono) hi-fi Power Amplifier. With a high-voltage, high-current output stage enabling it to deliver well above its rated power to handle musical transients, and a 'soft clipping' circuit which gently limits the waveform voltage when the amplifier is driven beyond its rated power. The US version of this power amplifier has higher clipping, dynamic and bridged power output.

On the rear, Main-In sockets for connection to a pre-amplifier, connectors for two pairs of loudspeakers A and B, switches for Soft Clipping (On/Off), Bridging (On/Off) and a Speakers Impedance switch (Normal/Hi (≥ 8Ω)), the Hi setting can be used where one pair of speakers are connected and their impedance is at least 8Ω, this re-optimizes the amplifier for maximum power. A switched and an unswitched AC outlet is fitted on non-European models.

On the front, switches for Power, Speakers A, B, LED indicators for Power, Protection and Soft Clipping and a jack for headphones.

Specification
Stereo Mode
Speakers Impedance Switch Set:           Standard   US Version
Continuous Average Power Output at
 8 ohm 20-20K Hz both Channels Driven :  55 W        55 W
Rated Distortion  20Hz-20kHz ...............:  <0.03%    <0.03%
Clipping Power at 8 ohm .......................:  65 W        75 W
                       at 4 ohm ......................:  75 W        90 W
IHF Dynamic Headroom at 8 ohm .........:   +2.6 dB    +3 dB
IHF Dynamic Power at 8 ohm ...............:  100 W      110 W
                        at 4 ohm .....................:  100 W      130 W
                        at 2 ohm .....................:  130 W      150 W
Damping Factor at 50 Hz (Ref. 8 ohm) ...:  > 50
Input Impedance ..................................:  22kΩ
Input Sensitivity for 1W/55W out ...........:  0.13V/0.95V

Bridged (Monophonic) Mode
Continuous Average Power Output into
  8 ohm (Min, RMS power per channel
  20-20kHz both Channels Driven
  with no more than rated distortion) ......:  125 W      150 W
IHF Dynamic Headroom at 8 ohm .........:  +2.5dB
IHF Dynamic Power at 8 ohm ...............:  250W
                   (max Short term output)

Versions/Power Requirements
A  USA                    / 120 V AC 60Hz
A1 Canada               / 120 V AC 60Hz
B  UK                       / 240 V AC 50Hz
B1 Australia              / 240 V AC 50Hz
C  Europe and others / 220 V AC 50Hz
C1 W Germany         / 220 V AC 50Hz

Made in Japan

Here you find 120 models, 118 with images and 24 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from NAD, New Acoustic Dimension; Ontario