to eliminate the subs as the issue just wire them from AVR-AMP-SUB id just do one at a time to see make sure they are working, if you can confirm that the subs and sub amps are fine then it points to something else inbetween. yes its very unlikely all failed at once, the AMP or other electronics is a more likely source of failure IMO
I started the experiment by eliminating the Matchbox HD from chain first. BAM! Test tones coming through again!!
From everything I have read, those MB units should be near-bulletproof. Oh well.
We will see how their vaunted customer service responds to helping out with my unit that has only been put in service for eight months.
In the end, I'm just glad it's not the subs. That would have been a pain in the a**.
MB is easy to ship. Although, it would have been nice if it had just been as simple as replacing the inexpensive RCA Y!
Crest Pro-LITEs...The amplifiers pass safety agency requirements for a two ohm rating. That means continuous operation at 1/8 power (considered to be normal operation) at 10% high line (132VAC). At four ohms they breeze through the rating and come close to handling continuous full sine wave power. Depending on the model, they probably run minutes before the breaker eventually trips.