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The NuPrime ST-10 is a 150W x 2 (8 Ohms) Reference LE Class stereo power amplifier utilizing a 4th generation V4 module to deliver high-efficiency Class D amplification. It features low distortion (0.01% THD+N), a high damping factor (~400), and a linear power supply with a toroidal transformer.This is a used amplifier in excellent condition, showing minimal scuffs and wear from use. Original packaging and any paperwork are long gone but extra care will be used to insure safe shipping to you. This was pulled from a working system last April so it has not seen much recent use. This NuPrime ST-10 has been inspected, tested and everything works as it should. This unit was used in a pet free, child free and smoke free environmentKey Specifications·Power Output: 150W x 2 @ 8 Ohms; 150W x 2 @ 4 Ohms·Gain: X 28 (RCA), X 52 (XLR)·Frequency Response: 0 Hz to 60,000 Hz (-3dB)·S/N Ratio: 110dB at 1W, 10W, 100W·Input Impedance: 23.5k Ohms·Input Sensitivity: 0.89 V to rated power·Inputs: 1 x RCA (Unbalanced), 1 x XLR (Balanced)·Outputs: 5-way binding posts·Dimensions: 59 mm (H) x 215.4 mm (W) x 394 mm (D)·Weight: 6 kg / 13.2 lbs. Key Features·V4 Amplifier Module: Features an enhanced even-order harmonic (H2) circuit that mimics tube-like sound without the disadvantages of tube designs.·High-Efficiency Power Supply: Uses a linear power supply for reduced high-frequency noise and better low-frequency performance.·Zero Phase Shift: Designed to eliminate the phase shift common in other class D amplifiers.·Input Flexibility: Includes both RCA and XLR inputs and a 12V trigger input.·High Power Efficiency: Runs cool at 85% efficiency
US$800 is a strong buy here: it lands below the US$838 25th percentile and well under the US$875 median for recent used comps, so this is priced like a bargain rather than a stretch. That leaves room for it to be an easy yes if the unit is clean and fully functional.
The ST-10 is a well-liked, no-nonsense stereo power amp with plenty of grip, good drive, and the kind of straightforward presentation that suits a wide range of speakers. If the listing includes the original box, remote-trigger accessories, or clear proof of careful ownership, that only strengthens the value.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
NuPrime Audio is a California-born hi-fi brand founded in 2014 by Jason Lim, the co-founder of NuForce’s high-end division. After NuForce’s premium assets were acquired, NuPrime was established to carry that engineering lineage forward, keeping a strong link to the earlier company’s reputation for compact, high-performance electronics. The brand is now managed by Nuoem Pte. Ltd., reflecting an international business structure even as its identity remains rooted in U.S. audio design.
NuPrime is best known for amplification and digital electronics: integrated amplifiers, stereo and mono power amps, preamps, DACs, streamers, phono stages, and related components. Its catalogue leans heavily toward Class D and hybrid designs, often paired with proprietary input stages and compact chassis aimed at high efficiency and low distortion. It is not primarily a speaker, turntable, headphone, or cable brand.
In the market, NuPrime sits in the serious enthusiast and upper-mid to high-end niche. It appeals to buyers who value technical innovation, small-footprint components, and a clean, modern presentation over nostalgia or luxury styling. The brand has a strong reputation among detail-oriented hi-fi listeners, especially those looking for ambitious electronics at prices below the ultra-exotic summit-fi level.
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