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The A-47 is a successor model to the A-46, based on the design
technology developed for higher-ranked models. It is a full-fledged Pure
Class A Stereo Amplifier that produces truly captivating sound.
The output stage of the A-47 uses high-performance power MOS-FETs
ideal for audio applications. For each channel, six devices are arranged
in a parallel push-pull Pure Class A arrangement. This results in very
low output impedance, ensuring that constant drive voltage is available
also for low-impedance loads. Superior performance is evident from the
linear power progression of 45 watts into 8 ohms, 90 watts into 4 ohms,
and 180 watts into 2 ohms. The amplifier is even capable of driving
ultra-low 1-ohm impedances with an amazing 360 watts (music signals
The input stage circuitry is configured as an instrumentation
amplifier. This approach makes it possible to achieve fully balanced
signal paths, extending from the signal input all the way to the final
power amp stage.
Using the A-47 in bridged mode creates a mono amplifier with even
more impressive power output capability, rated for 180 watts into 8
ohms, 360 watts into 4 ohms, and 720 watts into 2 ohms (music signals
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