I used ASI-Tek in 2010, to do the full-tour mods to a DEQX. I strongly dis-recommend them. The online presentation looked very promising and the description of the mods made sense. Unfortunately, the execution of the mods was a complete failure. The DEQX did not even perform its basic crossover functions when I got it back, and the sound was so distorted as to be completely unlistenable - I measured 70% THD on my HP distortion analyzer.
After back-and-forth by email (his replies were random but usually long-delayed), and 1 return of the item to give him a chance to get it right, I eventually had to learn surface-mount soldering to undo his mods and rebuild the thing myself.
It turns out that ASI-Tek is a 1-man shop, without the appropriate range of test equipment, and is all promises and no capabilities.