I just received an Ashdown RM-800 (not the EVO) head from GC a few days ago. It was discounted to $299 and I would hate to have to return it, but, the amp shut down twice and I have concerns. The only thing my TB search turned up was a similar issue that occurs with some GK MB series heads when the gain is set higher than the master volume. I’m wondering if this is related. Here is my test setup: A speaker was connected to the output but the master volume was set to 0 because I am DI’ing out to a Behringer mixer and listening through headphones connected to the mixer (I live in an apartment ). I plugged my passive G&L JB-2 into the amp. I *THINK* these may be the two key causes of the shutdown: The amp “Input” knob was all the way up. The only reason it was set that way was because the VU meter needle was barely moving when I played (the bass volumes were both dimed) and I was simply wondering if I could ever get the needle anywhere close to the red zone. That is a separate issue, about which I have emailed Ashdown tech support; no reply yet. The compressor was turned all the way up (not that I ever intend to play that way, just testing it). Within one minute the amp shut down as if I had turned the power, twice. Each time I cycled power the amp came back on. Right before shutdown it seemed that the audible level was sagging, and I did hear some distortion, as I recall. I have since dialed back both the compressor and the gain to about 12 o’clock and the shutdowns have failed to recur. In a live situation I never dime anything, so maybe the amp will never shut down again, but can I be sure? I know that amps can thermally shut down, but in this case the speaker was not being driven. So, did I simply overload the input into the power amp, and was the shut down a built in feature or a sign of a defect in the amp?