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...

Well, I think this post will be little longer. First, I would like to thank Anthony for excellent job he did with this amplifier (Thank you, Anthony).Amplifier that I was using for a long time was one build based on AV400 schematic diagram, and I was pretty satisfied with it. Lower frequencies were very good, high ones were little “pulled back”. This, of course, could be attributed to my diy pcb, not so perfectly paired output transistors, or something else other then schematic diagram.When my amplifier died (I'm not revealing why), I purchased two NXV200 modules, ones with “garden” feedback capacitors. Power supply I build with 500VA 2x35V toroid, 6x10000uF capacitors (not low ESR), two block bridge rectifiers and 680nF + 1Ohm “snubbers”. First tests I did by directly coupling amplifier and my old Sony player's variable output. I was not impressed by result, but I was thinking “Well, I...