Just purchased a Used 1001RB-II from Guitar Center and it just arrived in the mail today. My gigging cab is a GK NEO412, but I keep that in storage. My practice cab is here at home (Behringer BB410) so I plugged into that to test it out. Now I know the amp is too powerful for this cab (Behringer rates it at 1000w... we all know it’s not that though) but the speakers start distorting and farting out at very low volume. Not even bedroom loud. Amp sounds beautiful but if I turn it up just a little the A and E string start distorting nasty. Messed with the EQ, added the pad, tried Active and Passive bass - distortion no matter what. Thought maybe I blew my cab last practice, so plugged in my 450w Behringer head and the cab sounds fine with that even at loud volume. My next step is to go to storage and test the 1001rb with my GK cab and see if it’s the amp that’s busted. My question is: if it sounds fine with the 412, is it normal for a stronger amp to distort a weaker cab even at low volume? Or is there a high chance this amp is busted? I’ll be a little turned off if this means I can only use that head with my gigging cab. I was hoping I could run it with either cab so that I can get some practice time with it.