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Fierce 7-channel amplifier beast

The Musical Fidelity M6x 250.7 is a "super quiet" 7-channel amplifier, with enough punch to knock anyone out.

written by / 2022-09-27 - 8:00 am
Fierce 7-channel amplifier beast

If you’re the kind who isn’t satisfied with two channels, but also isn’t content with a small, compact home cinema system with a crappy soundbar, Musical Fidelity may have the answer to your dreams with the 7-channel M6x 250.7.

Photo: Musical Fidelity

If the goal is to recreate exactly the sound the filmmaker intended in the home cinema, then we’re literally talking about bringing the entire cinema sound into the home. An amplifier then has to be able to supply enough power for all channels, with plenty of current surplus to cope with the massive dynamics.

Musical Fidelity claims to be able to do just that with the M6x 250.7 – a proper beast of a power amp.

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Class AB

We’re not talking about Class D or digital amplification here; instead, we have two powerful but “super-quiet” toroidal transformers driving all the channels in traditional Class AB. This practice is becoming less common because the technique is not as efficient as Class D, because a considerable amount of power is lost as heat. But it’s necessary to create “an abnormally wide dynamic range at high volume,” Musical Fidelity says.

Cooling fans? “Not on our watch,” the manufacturer insists. Photo: Musical Fidelity

No fans

Although the amp can get hot, Musical Fidelity dislikes fans like the plague, and uses plenty of heat sinks instead. This method requires more material, and makes the amp heavy. In this case, we’re talking about a combat weight of 32.5 kg!

To achieve the lowest possible noise floor, the M6x 250.7 has balanced XLR inputs on all channels. If your processor doesn’t have that, you can use the gold-plated RCA connectors instead.

The speaker terminals support both spade and banana plugs, and of course you can use stripped cable ends.

Musical Fidelity M6x-250.7 transformers
Two heavy-duty toroidal transformers provide the power supplies to the amplifier stages. Photo: Musical Fidelity

Need even more power?

If for some reason you still feel you need more power than the M6x 250.7 can give you, each channel also has an RCA output so you can connect additional power amps. This can be handy if you want to biamp the speakers, for example.

Musical Fidelity M6x-250.7 rear 3
Use the XLR inputs to achieve the lowest possible noise floor. Photo: Musical Fidelity

Musical Fidelity M6x 250.7: Price and availability

The Musical Fidelity M6x 250.7 is available to order now, and costs €3,490.

Specifications:

  • Dimensions (WxHxD): 450 mm x 195 mm x 435 mm
  • Maximum power consumption: 2500 W, <0.5 W in standby
  • Weight: 32,5kg
  • Connections:
    7x RCA line in
    7x XLR balanced in
    7x RCA line out
    7x pairs of speaker terminals
    1x 12 V Trigger in/out
  • Input level: 700mV RCA, 1.4V XLR
  • Output power: 7x 250W/4 ohms (Peak: 400W)
  • Harmonic distortion: 0.003% @100W
  • Frequency range: 20Hz – 20kHz (+/- 0.5dB)
  • Signal-to-noise ratio: 105 dB (1kHz, 200 W)

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