Good to note thanks wazkelly.
A few other the other guitarists I play with also have basses (just cheapies as well) so I'll start taking note of the volume settings they're using on the bass amp. When I have my yammy plugged in I'm only sitting on around 2-3 on the dial and it's plenty loud as a stage monitor.
I will head to practice early tonight and plug it in for a proper test run and see how it sounds - certainly don't mind turning up the volume so long as it remains reasonably clean and noise free.