The NuPrime Reference 20 Mono Amplifier

NuPrime Reference 20 came from the evolution of esteemed NuForce's award-winning Reference amps, after NuPrime has acquired the NuForce high end product line. While the Reference 20 retains all of the Reference 18's superior sonic attributes, the amp’s higher 420W @ 4 Ohm output power brings one closer yet to the goal of supreme performance. The Ref 20's low-ESR Cross Matrix Array (CMA) capacitor assembly features high-performance capacitors in a proprietary, non-resonant alignment. Unifying such refined technology with superior power yields truly unsurpassed speed, transparency and resolution, along with genuinely authoritative dynamics. The net response is a natural, non-fatiguing rendition of music that simply flows from a palpably real soundstage.

A pair of Ref 20s in a fine, audiophile-grade system will reveal the following qualities:

  • Thundering dynamics and lightning-fast transient speed
  • Sweeter, more natural highs
  • A near-palpable midrange and overall harmonic structure, resulting in a more natural and relaxed presentation
  • A beautifully textured low end exceeding even that of the Ref 20's exemplary authority and control
  • A deeper, more coherent soundstage

Without a doubt, the Ref 20 is destined to be found at the very heart of any dream audio system.


Configuration:Mono Input: RCA and true balance XLR Frequency Response: 20 Hz -0.3dB to 120 kHz -3dB
Peak Output Power: 8 ohm (400W) 4 ohm (800W) 2 ohm (1600W)    
RMS Power: 8 ohm (200W) 4 ohm (420W) 2 ohm (420W)    
Input Impedance: 22K ohm    
Input sensitivity: 161mV, 1W@8 ohm; 1.61V, 100W@8 ohm; 1.136V, 100W@4 ohm; 2.34V, 425W@4 ohm THD+N: 0.01%, 1kHz, 1W to 10W, A Weighted
Input sensitivity for maximum power: 2.5V Gain: 27 db
SNR: > 100db at 100W Trigger Input: 12V DC
Dimensions: 17 in W x 15 in D x 1.97 in H (2.56 in H including feet) Weight: 16 lbs
Worldwide AC voltage: 90VAC~130VAC or 210VAC~ 250VAC with voltage select switch. AC Fuse: Slow blow, 5A, 250VAC

Reference 18 and Reference 20 Reviews

"…from the moment I powered-up the Reference 18s they immediately produced a more detailed, threedimensional, and dynamically expressive sound than any of the NuForce amps I’ve reviewed in the past…left behind the world of incremental improvements and instead offered a substantial sonic leap forward. ..Dynamic contrasts are one of the things the Reference 18 does best, so that at times the amp creates the illusion that it has, in a subtle and entirely appropriate way, unlocked and expanded the dynamic range of familiar records…I couldn’t help but notice how much sheer sonic information the amplifier was conveying…becomes noticeably more liquid, easygoing, and relaxed. As a direct consequence, musical details are allowed simply to happen, unfolding effortlessly and naturally without the amplifier imparting any excess edge... 

...The Reference 18 does an increasingly good job of capturing the sense of air surrounding instruments or reverberating within the confines of recording spaces… The fascinating result is that both lateral and front-to-back imaging become at once more focused and specific, yet also exhibits a more natural and organic sound…it is hands down the finest amplifier NuForce has made, and I think it is good enough that it deserves to be included in most any discussion of top-tier amplifiers. Even if you have heard (and perhaps disliked) Class D amplifiers in the past, this is one I think you will find worthy of your time and consideration…keeps faith with the truth of the recording itself, which is all anyone might ask of a fine power amplifier…" - Chris Martens,
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" day well into the review period, while working out, I was playing Donald Fagen’s Morph the Cat (CD, Reprise 49975). Out of the corner of my ear, I heard what I’d been missing. I sat down in my listening seat and there it was: the dimensions of both individual instruments and the recording venue were revealed. This screwed up my workout, but I sat there and listened to almost the entire CD -- the Reference 18s were unraveling and presenting this recording in a new way...", - Tim Shea, SoundStage!HiFi magazine
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