Hi there.

I am using Arcam av50 as the processor and some of its power
amp section. I also have an Arcam delta 290 that I am using
as power amp. So, the av50 and delta 290 are used to passively
biamping a pair Newform Research speakers (front).

Problem: Recently, the delta 290 would shutdown suddenly and
come back on in a second or two. I leave the amps on all the
time. Sometime the delta 290 would shutdown while we are
watching movie. Other times it would shutdown while not in
use. The shutdown causes a popping sound in the speakers.

Questions: What is wrong with the amplifier? Is the amplifier
dying? Is the popping sound damaging to the speakers?