Hi, I've tuned my subs be ear and left them that way for a while, but I would like to tune them correctly with a multimeter so I can get full power (I kept it down to be safe) out of the subs. I know all settings should be flat and if I want loudness or bass boost on I should tune the amp with them on, but I don't know what to set the subwoofer level at. My stereo has a subwoofer level from 0 to +15. I leave it somewhere between 0 to +5 for normal listening because that's more than enough, but when I want to show off I obviously turn it up to +15. That being said, what should it be set at when I tune the amp or does it even effect it?