[quote name='Al Krow' timestamp='1509706073' post='3401001']
With due respect Alex, I think that's rubbish. Adding a preamp pedal to a signal chain can and does increase volume or I've gone completely deaf (which I haven't), provided the cabs can handle the extra power and there is no way that two of your BF BB2s won't be able to, right?
A power amp is boosting (literally 'amplifying') whatever signal it is receiving and whether it be by replacing underpowered pots on your bass or boosting the signal via a preamp the power amp can only boost the signal that it is fed to it in the first place.
[/quote]
If the power amp is running out of 'steam' (which it seems to be in this case) simply boosting the signal being sent to the power amp will not increase db or headroom. If what you say was true we could all use tiny power amps and just add, or turn up, a preamp.