My '76 full stack is now complete... I already had a 1976 Marshall (Straight) 4X12 w/G12M 75hz "Blackbacks" (Greenbacks). Today, I just added another...a 1976 Marshall (Straight) 4X12 w/G12H30 55hz "Blackbacks."
The G12M cab is a lot smoother, more neutral in the midrange and has a focused bottom end that's "crunchy" and not overly "big." The G12H cab - especially having the 55hz models - has a bigger bottom end to it. It seems to have some more emphasis in the lower mids and it's also brighter, but not in a bad way. They compliment each other well. Vintage Marshall cab mojo FTW...:metal:
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