Preliminary listening impressions - no background hum or buzz, very quiet. Amps sound extremely nice! Nice clarity and soundstage, bass is quick and tight....I will admit that I have never fully believed or perhaps comprehended the "burn in" period discussed in camps at several levels but….. my goodness. I would say after about 6 to 8 hrs of play time, the sound really came into its own. The bass improved significantly, sound stage is staggering, highs are sweet and the mids are right where I want them. Listening to this amp play was pure pleasure. I am really looking forward more "seat time" with this unit along with more "burn in". You really are able to pick out subtleties on a CD that you have not heard before - even with my modest system. I am truly looking forward to showing off your handiwork to my friends who now may...

Hello, my name is Troy Madden and I wanted to share my experience with Anthony and his NXv200 amplifier modules. I had decided I wanted all rack mount audio equipment and to buy used rack mount amps and update them with state of the art electronics. After browsing eBay for a while I settled on Sumo amplifiers. I really like the look of them, and they have large heat sinks and beefy power supplies, since they are class A-AB. I was able to buy the Polaris's for less than one could buy chassis, heat sinks and transformers, etc. Since I am tri-amping my system, I bought 2 Polaris amplifiers and 1 Andromeda. Meanwhile I was also researching amplifier kits and modules. I found Anthony's site and was impressed by the specs on his modules so I ordered two of the nxV200's for my tweeter amps and Two NX400NP for my...

Congratulations on very fine amplifier Anthony, it exceeded my expectations. You should be very proud of this design.The grip it has controlling a speaker is quite remarkable and smoothness is outstanding. 4 hours straight, no bleeding ears, fatigue or head ache.This review can also be found on the following link at Stereo.net.au http://www.stereo.net.au/forums/showpost.php?p=154573&postcount=62Over the last few years I have tried a fair portion of the more popular DIY power amplifier designs on offer. The ones I admit to are from Aspen (AKSA 55, 55N, 55N+, Lifeforce 55), AudioSector (LM3875, LM4780), Aussie Amps (NX150), ESP (P3A, P101), SKA (GB150). I’m not going to compare the NXV200 to any of these amplifiers as they are well documented elsewhere.I accidentally came upon the NXV200 after talking to Anthony on another matter and the entry price for a fully built amplifier module was very attractive. I do not run at super high SPLs but...