Well... I'll tell ya

for my metal project, I play a Schecter riot 5 string, 18v, hot emg pickups, Ash/Maple, .145 low b, really aggressive tone. I run that into a sure wireless, the pedal board one. From there it goes into an mxr 85 bass distortion, then to the amp, where the OD circuit lives. Effects loop is danelectro 18v cool cat chorus, into broughton hpf/lpf, into earthshaker devices ghost echo reverb.
Even with the hpf, my hammering on the .145 low b string with all that boost to the signal from the various effects... Those 2 10's, impressive as they are, can't keep up and it was Fart City. I could get it to mellow out, but in doing so would either lose my preferred tone in an unacceptable manner, or wouldn't have the volume to use it as a monitor with the 5 piece metal band I'm in.
I just need more headroom, and had the ampeg 4x10 laying around. For gigs I'll pick up the matching rumble 2x10.