I use a keyboard amp, a 100 W TOA. I was advised that I could play everything through it, from autoharp to mandolin to guitar to bass. Plus it has four inputs, and a microphone jack. It doesn't have all the effects that some amps have, but it sounds real clean. I used to have an old Music Man tube guitar amp, which would have been great for rock guitar. But it didn't sound very good with acoustic instruments, and it didn't handle the bass very well. BlueJay