[quote name='alexclaber' timestamp='1434530383' post='2800383']
I just realised you have some more options with this - as I said before, if it's needing to drive the speakers hard enough to get the growl, use one cab instead of two. If one cab is still too loud then we're releasing a One10 soon but I don't think that'll be the case. If it's needing to drive the amp hard enough to get the dirt you want, then using fewer cabs and/or running a higher impedance load will make the amp work harder - so you could run a 12 ohm Two10 vs a 4 ohm Two10 and see which works better.
I do think it's probably your ears though and how the room acoustics are changing as the venue fills up and how the band is playing louder (thus masking more of your tone) in the gig vs the soundcheck. It's complicated! Enjoy the hunt for consistent tone!
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Oh if only there was a solution where using a PA speaker type set up