Moon Audio NEO 400M Mono Blocks PAIR

I have had these for a couple of years and bought them as a Demo from a store that went out of business. They sound superb. Find reviews and read for yourself, don't take my word for it.
Design features

• Fully balanced differential circuitry.

• Precision matched proprietary MOON Bipolar output transistors for improved bass response and accurate sonic reproduction.

• An oversized power supply using a custom proprietary toroidal transformer design.

• A high damping factor yielding superior musical dynamics, improved signal speed & refined timbre accuracy.

• “Class A” output to 10 watts for greater efficiency.

• Optimized selection of very high quality electronic components.

Your MOON 400M Power Amplifier incorporates many
significant design features to achieve its “world-class”
level of performance. This is an abbreviated list of the
more important features:
Proprietary “Advanced Rennaisance” Technology
which eliminates feedback. The results are: Real-time
amplification, more accurate musical reproduction and
the elimination of transient intermodulation distortion.
Balanced differential circuitry.
Proprietary MOON Bipolar Output transistors with
unprecedented gain linearity resulting in improved bass
response and even more accurate sonic reproduction.
Class A output to 10 watts for greater efficiency.
An exceptionally short signal path for a faster transient
response.
A high damping factor which yields superior musical
dynamics, improved signal speed and refined timbre
accuracy.