Overloud Th3 - 345 Hot!
The default 4x10 cab has a low resonance at 100Hz. If you are playing drop D or 7-string (unusual for this amp, but fun), move the Low resonance frequency to 80Hz and increase the Q factor to 5. This makes the 345 thump like a closed-back 4x12 while retaining the open top end.
While newer versions exist, TH3 holds a special place for specific reasons that this "345" setup highlights: overloud th3 345
Ranging from classic vintage tube amps to modern high-gain monsters. The default 4x10 cab has a low resonance at 100Hz