B&K. You call them, and a real person who behaves professionally answers, and transfers your call to an expert. They anwer questions, send you info. Their web site is complete with info and downloadable docs. I sent my AV5125 5 channel amp in for service - it had an intermittent clipping in one channel. They fixed it and tuned up all of the other channels - no charge, not even for the shipping or the new B&K shipping carton they sent it back in.
Other companies I've dealt with are amaturish or slow to respond by comparison (Rega, Parasound, NAD, Exposure, others)
Other companies I've dealt with are amaturish or slow to respond by comparison (Rega, Parasound, NAD, Exposure, others)