Bloody awful crap products. First amp faulty.
Second amp humming like crazy. Avoid. £2000 down the toilet can't get money back.
Distrubitor lousy service. Not fit for use.

Not even 1 star.

I purchased a pair of ATI 2003 amps to drive a pair of JBL K2 S9900 speakers and a pair of JBL Synthesis® S2S subs. Each 2003 feeds a K2's LF and HF inputs and an S2S. The subs only come online below 40 Hz.

Many amps went through this system before the ATI came to stay. Most of the other amps looked prettier and had more recognizable pedigrees (and cost up to 4x as much), but I'm not interested in showcase quality amps; I'm interested in amps that can be tucked away and forgotten. I want amps that power on unobtrusively and deliver effortless power and precision without noise or fatigue. Running balanced cables from my pre to the ATIs makes a quiet, quiet background, and the dynamics and range are astounding.

While the aesthetics are minimalist, the build quality is first class and the engineering is superb. It's the best amp you may never have heard of, and IMO it's better than most you have heard of. I can think of two or three amps I'd concede as superior, but I don't want to spend that much money (over $10k).