Guitar Forums

My combo has an external speaker jack, and I’m thinking of adding a 1x12 extension cab for bigger gigs. Does this noticeably improve fullness, or is it mostly about volume?

I run my combo with an extension cab all the time, and the biggest difference I notice is the way the sound spreads on stage.
Instead of a narrow beam coming from one speaker, the wider footprint makes it easier to hear yourself and helps the band balance without turning up as much.

Just make sure the impedance matches what your amp expects when running both speakers.

It can add both volume and low-end, especially if the extra cab has a different speaker that complements the combo.