i checked it out...nothing is wrong inside with the wires ...preamp...or input...this is a brand new bass dude...so nothing's going to be wrong with it....they usually check them out before they send them off to be sold...besides..if something was wrong with the input...no sound would come out of the bass or there would be popping and stuff...so there's no problems...and everything works with the battery in...with the battery out the eq knobs don't work...that's the only difference...and that's how it is supposed to be...hence battery= active electronics....no battery= passive electronics
