Peavey mark III centurion + orange obc410

Mar 27, 2011
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Hey guys, I just switched from my orange terror bass 500amp to peavey mark III ('78 - rly good buy). I was wondering, can these old amps switch ohms (cant find it)? Will it be a problem pairing it with my orange 4x10" cab (8 ohms)? I just read the amp is 4 ohms. Thanks for any help.