I have a marshall avt100 but I need it a little bit louder. can i put a cabinet under this combo amp to make it louder?

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i have a valvestate avt 150 and there is an 8 ohm extention jack on the back. If your 100 has that jack then by all means hook it up right through there
Adding a cabinet under an amp rarely makes it "louder." It'll sound bigger, but in terms of decibels, there won't be any difference.
Gig Rig:

Schecter Hellraiser V-1
Crate BV120H
B-52 LS 4x12 cabinet
BBE Rackmount Sonic Max
Boss ME-50 Pedalboard
Digital Reference 2505 Wireless

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