to economize by running a guitar head and a bass head through a bass cab instead of having separate cabs? not at the same time, but what i want to know is if there would be any issue (or danger to the equipment) with the guitar head going through a bass cab.
i dont think so but i could be wrong

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Yeh the SICK! bit sounds a bit stupid.

you'd put the transformers in the amps at risk. you have to take note and make sure you match up ohms from the head and cabinet. and i doubt the cab has 2 inputs anyway.

so in a nutshell... bad idea if you wanna run them simultaneously.
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i knew running two heads at the same time could possibly do some damage, so that's why i said " "not at the same time"