Integrated amplifiers — Moon by Simaudio 641

Moon by Simaudio, the Canadian maker of the numbered Moon series, places its 641 integrated amplifier in the middle of its amplifier line, with more compact entry models below it and integrateds offering more power and features above.

Key specs that matter

Rated output is 125 W per channel into 8 ohms and 250 W into 4 ohms, a clean doubling as the impedance halves. Gain is 37 dB, input sensitivity is 300 mV and the damping factor is 700. Frequency response reaches from 2 Hz up to 90 kHz (+/-3 dB), with a 109 dB signal-to-noise ratio and THD plus noise of 0.003%.

Engineering and use context

Of the five line inputs, four are single-ended RCA and one is balanced XLR, and both types present a 22 kohm input impedance to the source. The chassis measures 481 x 102 x 465 mm and weighs 26 kg, a low case height for an amplifier of this output.

Pairing

Since its output doubles into lower impedances and the damping factor is high, the 641 suits a wide range of loudspeaker loads and sensitivities, including demanding low-impedance designs.

Alternatives

The Moon 700i V2 is another integrated amplifier in the Moon by Simaudio range.