M250i mono power amplifier

To within an inch of your life

We thought we’d allow one or two experts to introduce you to the M250i.

Andrew Everard, in Hi-Fi News magazine (UK)…

“Please keep your arms inside the car during the thrill-ride.”

“The Gamut amps are an absolute riot, not just finding information in tracks lesser amplification merely suggests might be there but proving entirely unburstable right up to the limits of what a pair of speakers can handle. They deliver a sound that’s loud, proud and in the face when required, but are equally at home shimmering through some delicate acoustic recordings at tickover levels.”

“Prepare to reset your expectations of what a hi-fi system can deliver: the Gamuts have all the agility and finesse required for fine sound, but underpinned with a massive sense of unfettered power and total control. By any standards this is an amplifier priced well into the high-end, but it’s also one worth every penny, taking no prisoners while sacrificing nothing of the visceral thrill of ‘real’ music.”

And Jerold O’Brien, in Tone Audio magazine (USA)…

“They even sound incredible at low volume. Amplifier genius and mad scientist Nelson Pass likes to say that if the first watt isn’t great, the rest don’t matter. The M250i exemplifies this philosophy.”

“They stand on their own as world-class power amplifiers. In the context of tube and solid-state systems, they integrate easily into whatever components you happen to be using. Thanks to their high current capability, they drive any speaker with ease.”

“Easily the last power amplifiers you’ll need to buy. They offer musical delight with no negatives whatsoever.”

The Gamut sound

Where power meets precision and timing is everything

Power and precision, while not quite opposites, are often thought of as ‘either/or’. If you have one in spades, chances are you’re a bit less endowed with the other. When it comes to audio amplification, this poses a dilemma. Time then, for a radical rethink.

The solution, while not easy, is deceptively simple (the best solutions usually are). It’s also what sets Gamut amplifiers apart.

While most amps rely on a combination of multiple output transistors to achieve their amplification ‘oomph’, we use one single output transistor per phase, hence two per channel. That’s it. No rows of multiple bipolar transistors. Stunningly minimal and an absolute winner performance-wise.

Of course we’re not just talking about any transistor. These guys are massive – imposingly robust and immensely powerful (they can handle a peak current demand of 300 A and 100 A continuously). What’s more, the particular models we use are rare in hi-fi – you won’t find them in too many amps. The thing is, they’re an investment. But it’s an investment worth making and here’s why.

The more common approach of combining multiple output transistors (sometimes as many as 48 per channel) comes with some major sonic and technical compromises. Compromises that we simply aren’t willing to make. Think of it like multiple voices in a choir. No matter how talented or well-rehearsed the singers, the pitch and speed of each voice will vary fractionally, affecting the overall timing, clarity and dynamics of the sound. Similarly, no two transistors are exactly alike and so combinations of multiples will require all kinds of technical workarounds to combat ‘sonic smearing’. But the trouble with technical workarounds is that they tend to introduce yet more potential for sonic smearing. So a powerful amplifier built with 48 transistors is more likely to sound like a choir than one clear and consistent voice.

Gamut amplifiers use just one Herculean transistor per phase. What’s more, rather than using one NPN (negative-positive-negative) and one PNP (positive-negative-positive) transistor for each of the two channels, we stick with closely matched NPNs all-round. All of which enables our amps to meet our famously exacting standards for uber-precise timing, stunning clarity and vivid dynamics. In other words, to deliver that signature Gamut sound.

But don’t just take our word for it. Come and have a listen. We think you’ll love what you hear.

Every little thing auditioned

Every component in a Gamut amplifier is of the highest quality and has been hand-selected following intensive listening tests – from the circuit boards, via the non-magnetic chassis, to the superlative XLR connectors. No expense is spared.

So when you buy a Gamut amp you’re not paying for our brand name or for a swanky office in the best part of town. You’re investing in what goes into your amp, pure and simple.

We think you’ll hear the difference. Why not come and have a listen and judge for yourself?

   Features & specifications

  • 250 W into 8 Ω
  • 500 W into 4 Ω
  • 900 W into 2 Ω
  • 1 x XLR balanced input
  • 1 x RCA unbalanced input
  • All input connections gold-plated
  • 2 x speaker outputs
  • All output connections gold-plated
  • 20 kΩ unbalanced
  • 40 kΩ balanced
  • Adjustable: 0 dB / -6 dB / -12 dB / -14 dB
  • 5 – 100 kHz +/- 0.1 dB
  • @1 kHz <0.05%


  • > 100 dB ‘A weighted’


  • 50 W idle (min. consumption in ‘on’ mode)


  • Every Gamut amplifier has an error-checking start-up sequence that goes through several condition checks, lasting a few seconds, before allowing full operation.
  • A complex protection circuitry can detect DC errors, high-level subsonic signals, long-term ultrasonic signals, high temperatures and low impedance loads.


  • 100% designed and built in Denmark


  • Dimensions (mm): 158 (height) / 430 (width) / 420 (depth)
  • Dimensions (inches): 6.22 (height) / 16.93 (width) / 16.54 (depth)
  • Product weight: 35 kg
  • Shipping weight: 40 kg


  • 5 years


The M250i sports a sleek, minimalist Scandinavian design featuring black, non-magnetic steel bodywork with the option of either a black or a silver anodized aluminium front panel.

Black anodized aluminium

Silver anodized aluminium

Awards & reviews


“Its winning combination of tube-like liquidity, bloom and musicality coupled with solid-state grip, tonal neutrality and operational consistency… I was so bewitched that I bought the review samples.”

The Absolute Sound Golden Ear Awards, September 2017

“Fair warning: hearing may well lead to purchasing! Gamut is that good!”

Positive Feedback, June 2017
Read full review (of a complete
Gamut system including the M250i)

“The overall system performance was so effortless and true to life in tonal color, texture, and presentation, that it was disarmingly engaging.”

The Absolute Sound, March 2017
Read full review (of a complete
Gamut system including the M250i)

“The ‘Holy Grail’ of power amplifier design”

Hi-Fi Plus, March 2016
Read full article

“Even though their electronics and speakers produce perfect synergy, you do not have to have an all-Gamut system to achieve great results. Though you just might want to…”

Tone Audio, August 2015
Read full review

“Hugely impressive – and totally addictive.”


Hi-Fi News, May 2015
Read full review

More to discover

All amplifiers in the Gamut range are designed to match both internally and externally so when it comes to complementarity, they really are ‘made for each other’.

Di150 LE

Dual mono integrated amplifier


Dual mono preamplifier


Stereo power amplifier