Another technique as espoused by many bass amp owners is to gently back off the highs and mids, leaving the bass at mid point. This has a similar effect and allows for a little more gain without blowing something. I have tried it on my rig (Eden World Tour) and it works well in average/small rooms. Can't vouch for other brands but it must be worth a try when you consider the power drain caused by boosting lows a long way. Don't forget if you over-drive the output you will clip the waveform and possibly cook coils and/or tear cones.
so, sound authorative, but keep it musically balanced.