Here's some clips from a review on eopinions...
"The VanGogh series circuitry was designed by an intuitive engineer/designer named Karl Cummings. Karl is one of the main reasons I chose to pursue this amp, and I'm sincerely happy to have run into him and done my homework. The VG series is equipped with one of the most sophisticated and elaborate circuitry arrays ever dreamed up- 2 independent power arrays, superior power-regulation and Cap-bank ensuring powerful assertive transients with rock-solid efficiency and reliability, this amp truly, TRULY has it all. AND it comes with a price-tag that is far more than reasonable.
A very interesting thing has happened in mobile audio- namely, the market has gotten very polarized: Specifically, truly "audiophile" worthy equipment has shot right off the beaten path into the stratospheric realms of ultra-expense and ultra-quiet. Names like McIntosh quietly stepped back- you can get them, but you're gonna pay BUCKS. How about Brax? Serious goods? ABSOLUTELY. But also in the thousands! Soundstream has done something truly special here- they've constructed an amp with the sole intent of delivering the ultimate in sound quality and bridged the gap between the ultra-BLANG-BLANG and the realistically priced perfectionist-gear... Well.. I'll be ****ed- By George, I think they've really done it: The 500.4 and 320.4 are priced on the street at about 450 and 365 respectively- and well worth every penny!
SPEC: The VanGogh's are perhaps the most impressive amps to be seen on paper in a very, very long time. Aside from killer specs, shown below, I'm going to also show you that they've built these wonderful amps at a very usable size- unlike the behemoth monster-chassis competitors amps (check out the PPI 4125 that I love, except for it's massive size- see my review) The VanGogh's are very fittable and very usable- clearly, these things very extremely well thought out.
On paper, signal to noise of 115+dB, 500+ damping and .02% THD, well under inaudible. Distortion DOES NOT increase with an increase in input voltage- this is key, and a big part of why the circuitry is so ingenious. Frequency response extends far beyond what is audible, from 10-50K hZ. Because of the intuitive design, these amps are intended to be used to draw maximum watts with minimal distortion or color- with proper installation (proper gains setting specifically) you can crank these things up to "ear-bleed" and hear virtually no color- your car's interior limitations will become a limiting factor well before the amps capabilities limit you, this much is for sure."
