Me thinks there is some misinformation. Claims of an industry first? For a mere 250V/uS slew rate....check out some AVA stuff Omegastar EX ckts are up around 800V/uS now, from the previous slower 600V/uS www.avahifi.com And all this Mosfet mist blather. AVA uses modern MOSFETS from Exicon more linear, FAST etc. Me thinks did B& K get an AVA amp and decide this is how amp ckts should be done, done right. Why do you review Luminiance, a NEW brand yet continue to ignore a well established 35 year old brand like AVA? AVA is Fast with even better slew rates, and has everything needed for sonic bliss, extremely reliable, superior sonics, fast is putting it mildly. Not limited to just 4 output devices, my AVA/Hafler P500 REBUILDS (latest modern AVA ckts, driver boards etc) are 12 Mosfets on a massive fan cooled heatsink, running in MONO w/ a AVA Ultra phase inverter is cranking around 1200-1400W RMS, not this very restricted mrer few hundred watt things from Luminance. AVA original amps called FetValves 550h etc are a few hundred watt pc sonic masterpieces also, using similar ckts, super FAST, etc. 21st century, stop ignoring AVA, priced for mortals, with sound better than most, for prices based in reality. Like this B&K review mentioned, if AVA was priced like some other lesser performers, with exhorbitant prices like $23K, then it would get a Sterophile look? Be about the BEST, not the most overpriced, please.