Using Amplifi With Bass in AMPLIFi Posted March 12, 2014 Technically any guitar amp will work with a bass, but with differing sets of limitations and outcomes. I've plugged my p-bass into my Amplifi 75, and it sounds OK for living room practicing, but I'd never attempt to crank it up to even rehearsal volume because it's not made to do that. Wrong tool for the job. Bass frequencies require a transducer (speaker or speakers) that can handle low frequency notes in order to sound good at a reasonable volume. Bass amps have speakers designed to regularly handle these extended lower frequencies. Most guitar amps aren't required to reproduce extended low frequency notes on a regular basis, so they're not designed to reproduce these lower notes at high volume with good tone. I'm certain that the high and mid frequency drivers in the Amplifi are crossed-over so that damaging bass frequencies are filtered out, so playing at low volume won't damage them. It's why PA tweeters don't blow out even though a bass is played through them - same thing - crossover points. The short answer is yes, an Amplifi will make any instrument that's plugged into it louder, but not always with the best sound quality. If you crank the volume and over-extend the speakers with bass frequencies they're not designed for, you can also damage the speaker (8" or 12"). So you're OK the play in the bedroom, but don't crank it at a gig with a bass plugged in. It wasn't designed for this, and a proper bass amp will do a much better job. Hope this helps.