NuForce Reference 20 Monoblock Pair

The Nuforce/Nuprime Reference 20's are Analog
Switching Amplifiers using their own unique circuit design, substantially
different than class D designs that use standard and modified ICE and Hypex chips.
The 20's leave Class D weaknesses behind, with sweet liquid shimmering highs,
natural mids with timbral density, and killer bass. There are excellent reviews
online and in TAS (Editor's Choice Award) for the Reference 18 and 20 so I will
stick with my own impressions.

The 20's have excellent sound-stage
depth and allow the instruments on the edges and background to sound more
realistic with more bloom and air. They have incredible micro and macro detail
and at the same time are refined and relaxed.  For example, listening to Caverna Magica there is a couple very softly speaking at the back
of a cave nearly obscured by more prominent sounds - with most amps you can
barely tell they are there, with better amps you pick up that they might be
speaking French; with the 20's I can easily follow whole sentences. Singers who
slur or mumble words, are clearer and yet natural. Close-miked harmonica and
female singers which can be grating at high volume, are just clean and present
with the 20's. Attack/decay, speed, PRAT, and punch are excellent. The 20's
bass is the best I have heard, with excellent weight, slam, bloom, and
differentiation. RMS: 200W in 8 ohm, 420 into 4 ohm, Peak 400W into 8ohm, 800W
into 4, stable into 2 ohm.

The $1,500 Bob Smith (TDDS), factory
approved upgrades preserve the original genius circuitry of the 20s yet remove
nearly imperceptible RFI, EMI and vibrational distortion, and increase quiet by
using increase shielding, high quality copper ribbon wiring and a stabilized
power supply. I personally think that the modded 20's can complete at the
$50,000 amp level and be preferred by many music lovers. I preferred the
Nuforce/Nuprime Reference 20 monoblocks in my $150,000 system, to auditioned
Merrill, Hypheus, Chanel
Island, Hegel, Pass Labs,
and Constellation.

I am original owner
purchased 2015, modded 2017. Smoke free home. No Scratches, excellent
appearance and perfect mechanically, all original wood packing. Original purchase
price $7,600 + $1,500 mods = $9,100. I am selling $3,800 for the pair.