[quote name='hamfist' timestamp='1370455214' post='2101261']
Is your Marshall a combo or a cab ? My google search came up with both.
Anyway, whichever it is, if you have a power amp output from the Roland Cube and an input to the cab (or cab portion of a combo), then you should be able to power the Marshall with the Roland. Just make sure that the Roland amp can handle an 8 ohm speaker load, it certainly should be able to, but please check first.
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It's just the cab.