I'm not familiar with db drag rules as i haven't been to any events but at meca they will let you have a practice run that won't count might have to drop $5 to do it. Just get a term lab, run a sweep tone and find where you peak on the term lab. Then try to coordinate your songs off that frequency or just blast that frequency tone if rules allow it.
o ok then i did do it but at the time i had diff subs an box i had 4 alpine type r 15s in box tuned to 29hz an my bass frez was 34 or 35 now i have my box tuned to 35hz so ill figure it out at the next event thanks guys