Audio Database


A compact stereo / mono DC power amplifier that eliminates capacitors from the signal system and achieves amplification capability up to the DC range and faithful phase characteristics.

In addition to stereo operation, high-power monaural operation is also possible.

In the first stage, a dual transistor with uniform temperature characteristics is used as a differential amplifier for the current mirror load, thereby achieving high DC stability and minimizing harmful DC drift.

The voltage amplification stage improves open-loop distortion characteristics with a pure resistance load, and drives the driver stage and output stage to low distortion.
In addition, stable operation of the power transistor has been newly examined and stable operation against temperature change has been obtained.

By adopting a pulse power supply, the power transformer has been miniaturized to a few times smaller than the conventional one.

It is equipped with a power indicator by LED array in which 9 yellow LEDs and 3 red LEDs (24 LEDs for both channels) are directly bonded to a single substrate.

It is equipped with a protection circuit that disconnects the speaker by relay when DC component is input from the connected equipment.
This relay also works as a muting of the shock sound at on/off.

Precision finish die-cast cabinet is adopted.

Model Rating
Type Stereo / mono DC power amplifier
Effective output (20 Hz to 20 kHz) Stereo : 42W + 42W (8 Ω)
Mono : 80W (8 Ω)
Total harmonic distortion factor 0.02% (20 Hz ~ 20 kHz, Rated Output)
Output Bandwidth (THD 0.02%) 5 Hz to 40 kHz
Frequency characteristic 20 Hz ~ 20 kHz + 0 -0.1 dB
DC ~ 200 khz + 0 -3dB
Signal-to-noise ratio (IHF-A) 110dB
Residual noise 100 μ V
Damping factor 40 (8 Ω)
Input Sensitivity / Impedance 1V/47k Ω
Load impedance 4 Ω ~ 16 Ω
Meter range Range x1 : 0.15W ~ 160W
Range x0.1 : 0.015W ~ 16W
Pwer 100 VAC, 50Hz/60Hz
Power consumption 90W
External dimensions Width 297x Height 49x Depth 250 mm
Weight 3.5kg