I might sound like a complete fool here, but could you plug it in to your stereo amp?
Pianist here (so TAB would 'do my head in' LOL!), and when I'm playing my leccy keyboard, just quietly at home, we plug it in to the home stereo... Its a good roland performance one, worth more than my car so not a cheapy little one...
I don't know if bass guitar would blow it to bits, LOL, but I wouldn't have thought it'd be all that different, would it?