Усилители мощности стерео — Musical Fidelity M6X 250.5

The M6x 250.5 is a five-channel Class A/B power amplifier from the M6 series of Musical Fidelity, intended as the amplification behind a 5.1 home cinema system. It belongs to a family of M6x multichannel power amplifiers that also includes the 250.4/2, the seven-channel 250.7 and the eleven-channel 250.11. The build is modular, with a separate Class A/B stage for each channel, and the custom-made aluminium front comes in black as well as silver.

Key specs that matter

Each of the five channels is rated at 250 W into 4 ohm, with 400 W available on peaks. THD+N is 0.003 percent at 100 W output, and response stays within 0.5 dB between 20 Hz and 20 kHz. Signal to noise ratio reaches 105 dB, measured at 1 kHz with 200 W output. Damping factor exceeds 300, and crosstalk between channels is better than 80 dB across 20 Hz to 20 kHz. The rear panel carries five RCA inputs, five XLR inputs, five RCA through outputs and five pairs of speaker terminals. RCA inputs need 700 mV and XLR inputs 1.4 V for full output. The case is 435 mm wide, 195 mm high and 430 mm deep and weighs 30.5 kg, or about 34 kg in its shipping carton. Maximum power consumption is 1,500 W.

Engineering and use context

Because every channel has its own amplifier module, all five share identical ratings, so centre, front and surround speakers receive the same power. The supply is built around what Musical Fidelity calls a super silent audiophile power transformer. Cooling relies on heat sinks alone, and no fan is fitted, so no fan noise is added to the room. Both the RCA and the XLR inputs use gold-plated connectors. The through outputs let the incoming line signal on each channel be looped out to another component. A trigger input and output tie switching to a processor or receiver, and in standby the amplifier uses less than 0.5 W. The mains setting is 230 V or 115 V, selected inside the case, with 100 V as an option, at 50 or 60 Hz.

Pairing

A 5.1 layout uses all five channels for the front left, centre, front right and two surrounds, with a powered subwoofer handling the .1 channel on its own. Low-impedance front and surround speakers fall inside its ratings. The XLR inputs allow a fully balanced connection from an AV processor with XLR outputs.

Alternatives

Musical Fidelity's M6x 250.7 extends the same concept to seven channels, drawing up to 2,000 W from the mains.