GamuT SS amps are outstanding. The Mk. 3 series, 100W, or 200W,(two mono on same chassi) and 250W mono blocks. All have same refined signature. Just depends on speaker power requirement. Amps are high current. The secret to these amplifiers is only one giant switching MOSFET output device per channel. No matching problems. There are many excellent reviews on these amps. Some think they are state of the art. I have the D-100 Mk3 which I love (3500 new). I have plenty of head room with 88 DB dynamic speakers. These amps run very cool. I had the Pass Aleph 5 before, a pure class A amp which was excellent, but not as good as the GamuT and ran much hotter.