NuPrime AMG ONE Mono Power Amplifier (Monoblock), Grey (Each)

The NuPrime AMG ONE is a Class-D mono power amplifier (monoblock) that delivers 170 watts into 8 ohms and actively reduces distortion with NuPrime's Only Distortion Cancellation design (ODC).

In practice: one monoblock amplifies exactly one channel – with full attention, its own power supply, and short signal paths. For stereo, two of them work as a well-matched pair, one per speaker.

Why the AMG ONE?

The ODC design is NuPrime's Class-D topology: it measures distortion and calculates it back out again. The result is a clean, powerful tone that doesn't get harsher at higher levels but stays composed.

Behind it sits a 250 W toroidal transformer with 22,000 µF of filter capacitance – so plenty of reserve for dynamic peaks. In standby, the amplifier settles for 0.4 watts, which is pleasantly unobtrusive during continuous operation.

What you hear

170 watts into 8 ohms, 220 watts into 4 ohms, up to 260 watts at peak: that lets a pair of AMG ONEs drive even more demanding speakers under full control. Especially in the bass, the power shows up as precision rather than pushiness.

The very low output impedance (4 mΩ) gives a firm grip on the speaker – diaphragms follow the signal instead of ringing on. The NJR MUSES8820 op-amp in the input stage and the 600 kHz switching frequency keep resolution high.

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Who is the AMG ONE for?

For anyone looking for a compact, powerful power amplifier and wanting the benefit of separate monoblocks – ideal together with a high-quality preamp such as the AMG DAC or the AMG PRA. If you value clean channel separation and short signal paths, this is for you.

Straight talk: Don't look here for digital gimmicks, streaming, or a DAC – the AMG ONE is a pure power amplifier and needs a preamp in front of it. If you want an all-in-one device, you're better served by an integrated amplifier. If you deliberately separate your power amps, this is exactly right.

Our verdict

The AMG ONE is a surprisingly powerful, compact monoblock with NuPrime's clean Class-D signature. HiFi-IFAs calls the AMG ONE monos the perfect choice for music lovers who want to make almost no sonic compromises – at a more than fair price. The Absolute Sound listed the AMG ONE in its 2024 Buyer's Guide among the biggest high-end bargains. We at HD Zürisee in Wädenswil appreciate how easily it slots into an existing chain.

Technical data

• Design: Class-D mono power amplifier (monoblock), ODC design
• Input stage: NJR MUSES8820 op-amp, 600 kHz switching frequency
• Power supply: 250 W toroidal transformer, 22,000 µF filter capacitance
• Output power (RMS): 170 W @ 8 Ω, 220 W @ 4 Ω
• Output power (peak): 210 W @ 8 Ω, 260 W @ 4 Ω
• Gain: 26.44 dB (voltage gain 21)
• Sensitivity: 1.7 Vrms
• Input impedance: 47 kΩ
• Output impedance: 4 mΩ
• THD / S/N (typical): @5 W 0.003 % / 95 dB · @50 W 0.004 % / 105 dB · @100 W 0.03 % / 110 dB
• Frequency response: 10 Hz – 50 kHz (-3 dB)
• Trigger: IN (> 5 V/200 mA) and OUT (12 V)
• Standby power: 0.4 W
• Mains voltage: 115 / 230 VAC, switchable
• Dimensions (W × H × D): 235 × 55 × 285 mm
• Weight: 4.9 kg
• Colour: Grey
• Warranty: 2 years

Frequently asked questions

How much power does the NuPrime AMG ONE have?
As a monoblock, the AMG ONE delivers 170 watts into 8 ohms and 220 watts into 4 ohms (RMS), up to 260 watts at peak. That lets a pair drive even more demanding speakers under full control, without sagging during loud passages.

Do I need two AMG ONE for stereo?
Yes. The AMG ONE is a mono power amplifier (monoblock) that amplifies exactly one channel. For classic stereo operation you therefore need two units – one per speaker. The benefit is short signal paths, a separate power supply per channel, and very clean channel separation.

Which preamp suits the AMG ONE?
The AMG ONE is a pure power amplifier and needs a preamp or preamplifier in front of it. From NuPrime's own range, the AMG PRA or the AMG DAC with built-in volume control are good options. We're happy to help you work out which combination fits your setup.

What does the ODC design of the AMG ONE do?
The Only Distortion Cancellation design (ODC) is NuPrime's Class-D topology, which specifically reduces distortion. Together with the 250 W toroidal transformer and 22,000 µF of filter capacitance, it delivers a clean, powerful foundation with very low standby consumption.

Why buy the NuPrime AMG ONE at HD Zürisee?
Because a power amplifier only makes sense in the right combination. We help you choose the preamp and speakers, check the power for your room, and take care of installation and service with our own technician. Call, write, or come to Wädenswil.

Goes well with

To let the AMG ONE show its power, we've put together the right categories:

• The matching preamp: Preamplifiers
• Or as a source/preamp: DAC
• Plus the Speakers
• The right connection: Speaker cables
• More from the series: NuPrime