NuPrime AMG One Mono Amplifier

A Monoblock That Fits on a Shelf

The AMG One is a mono power amplifier: one chassis, one channel, one speaker. You buy them in pairs. Each one makes 170 watts into 8 ohms and 220 watts into 4 ohms, with peaks of 210 and 260 watts when the music asks for them.

What makes it unusual is the size. Each amplifier is about 11 inches wide and just over two inches tall, weighing 5kg. A pair takes up less shelf than most single stereo amps, which puts true monoblocks into rooms that could never house them before.

NuPrime describes the AMG One as a scaled-down Evolution Two. It runs the same ODC Class-D output design, so the technology that carries the flagship carries this one too, at a fraction of the price and a fraction of the footprint.

Inside the Chassis

Only Distortion Cancellation

ODC is NuPrime's own take on error correction. A conventional design inverts the output and sums it with the input to build a correction signal. NuPrime instead pulls the error straight from the MOSFETs and the output filter, which cuts how much negative feedback the circuit needs.

On the Bench

Distortion measures 0.003% at 5 watts and 0.004% at 50 watts, and stays under 0.006% across the 2 to 80 watt range where most listening actually happens. Frequency response runs 10Hz to 50kHz at minus 3dB, and input impedance is 47k ohms.

Running Costs

Idle draw is 8 watts and standby is 0.8 watts at 115 volts. Class D means the AMG One runs cool enough to leave powered up, which suits it, since NuPrime amplifiers are generally at their best once they have been on a while.

What Reviewers Are Saying

Dick Olsher, in The Absolute Sound on November 10, 2023, wrote that "The AMG One is currently not only my favorite Class D amp but also one of my favorite solid-state amps," calling it a "no-brainer recommendation."

On imaging he was blunter still, reporting that "It became clear that the AMG One could deliver a spatial impression that most solid-state amps can only dream of," and that "Bass extension and impact were superb."

Who Is This Mono Amplifier Best For?

• Anyone who wants monoblocks in a small room — Two chassis at 11 inches wide and 5kg each fit where a conventional pair never would, so you get the channel separation of true monoblocks without rebuilding the room around them.
• Listeners moving up from an integrated — 170 watts a side with 210-watt peaks is a large step up from most integrated amplifiers, and it arrives without the heat and bulk that usually comes with that much power.
• Owners of efficient speakers who care about noise — Distortion sits at 0.003% at the few watts most listening actually uses, so the amplifier stays out of the way on quiet material instead of adding a layer of its own.
• People who leave the system switched on — Eight watts at idle and cool-running Class D mean you can leave both amplifiers powered without a heat problem or a meaningful power bill, and they are always ready to play.
• It arrives as one channel, so plan on two — This listing is a single mono amplifier and drives one speaker. A stereo system needs two of them. If a single box has to do both channels, look instead at our Stereo Amplifiers.

How Does It Connect to Your System?

Each AMG One takes one input and drives one speaker. Run a cable from the left output of your preamp to one amplifier and the right output to the other, then run a single speaker cable from each amplifier to the speaker beside it.

Because each amplifier sits next to its own speaker, cable runs get short where it matters most. There is no volume control on board, so a preamp or a variable-output source sets the level.

Pairs Well With

Monoblocks need a preamp and a pair of everything else. Here is the short list.

• Preamplifiers — a stereo preamp feeds one AMG One per channel. Browse preamplifiers.
• Interconnect cables — you need two runs, one to each amplifier. Browse interconnect cables.
• Speaker cables — short runs, since each amp sits by its speaker. Browse speaker cables.
• Bookshelf speakers — 170 watts suits stand-mounts in a small or mid-sized room. Browse bookshelf speakers.

Frequently Asked Questions

How much power does one make?

Each AMG One is rated at 170 watts into 8 ohms and 220 watts into 4 ohms RMS, with peak output of 210 watts into 8 ohms and 260 into 4. That is per chassis, and each chassis drives one speaker.

Do I need two of them?

For a stereo system, yes. Each amplifier handles a single channel, so a pair gives you left and right. Home theatre builders sometimes add more, one per channel, and NuPrime sizes the amplifier with that in mind.

How does it compare to the Evolution Two?

NuPrime calls the AMG One a scaled-down Evolution Two. It uses the same ODC Class-D output approach in a smaller chassis with less power. The Evolution Two makes 300 watts into 8 ohms against this one's 170.

How big is it?

Each chassis measures 285 by 55 by 235mm, which is roughly 11.2 by 2.2 by 9.3 inches, and weighs 5kg or about 11 pounds. Two of them stack easily on one shelf.

Does it need to warm up?

It plays straight away, and reviewers report it settles further after about half an hour. At 8 watts idle it costs almost nothing to leave switched on, which is the simplest way to have it ready whenever you sit down.

What warranty does it carry?

NuPrime amplifiers in this range carry a two-year warranty through the US distributor. Call us at 800-942-0220 and we will confirm the exact term and what a demo or open-box unit carries before you order.

See It in Action

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Learn More

Want to learn more about mono amplifiers, Class D amplification, or matching an amp to your speakers? Visit our Learning Center for guides, tips, and expert advice.