Усилители мощности стерео — Moon by Simaudio 861

The MOON 861 belongs to the North Collection of Canadian maker Simaudio, positioned above the Compass range, and is a two-channel power amplifier. MDCA distortion cancelling circuitry is combined with a no global feedback design and proprietary MOON transistors. The US starting price is USD 24,000, and warranty coverage runs for 10 years, with parts and labour included after registration.

Key specs that matter

Stereo output is 300 W per channel into 8 ohm and 600 W per channel into 4 ohm, and in mono mode one chassis delivers 800 W into 8 ohm and 1,400 W into 4 ohm. Input sensitivity is 1.4 V, input impedance 47 kOhm and gain 31 dB. Frequency response extends from 2 Hz to 100 kHz at +0/-3 dB. THD+N is 0.002% at 1 W and 0.001% at 300 W, intermodulation distortion is 0.002%, signal to noise ratio reaches 119 dB, crosstalk is -119 dB and the damping factor is 900. Connection is via single-ended RCA or balanced XLR sockets. The enclosure is 48.1 cm wide, 21 cm high and 60.9 cm deep, with a shipping weight of 58 kg.

Engineering and use context

In a dual-mono arrangement, each half of the 861 is supplied by its own custom 1500 VA toroidal transformer, and total power supply capacitance is 228,000 microfarads. Heat is carried away by side-mounted heatsinks. A monaural toggle switch on the rear converts the amplifier into a single high-power channel, so a pair of 861 units can later serve as monoblocks. Consumption is 85 W at idle, 75 W in full power standby and 1.25 W in low power standby. A multicolour LED shows operating status, and MOONLink connectivity ties the amplifier into other MOON components over an Ethernet cable supplied in the box along with a quick start guide and power cable. Its depth and mass require a strong, deep rack or a floor-level amplifier stand with room for ventilation around the heatsinks.

Pairing

The high input impedance lets the 861 accept valve or solid-state preamplifiers without loading their outputs, and the balanced XLR inputs suit long runs from a preamplifier placed across the room. The high 4 ohm rating and damping factor give plenty of reserve for large, low-impedance floorstanding speakers. A MOON preamplifier or network player from the same North Collection completes the MOONLink control chain.

Alternatives

The MOON 461 from the Compass Collection is a smaller stereo power amplifier rated at 150 W into 8 ohm and 300 W into 4 ohm.