The local shop is having an informal show and shine and db drag.
I think i wana try to see how loud i can be.. I dont have anything special so......
anyway do you have to bring your own cd? Should i just down load a certain frequency and adjust the gain appropratly??

 

Usually at SPL shows the officials will have a disc you can borrow.

Play your system as little as possible for a while before, run the engine to make sure the battery is fully charged.

I'd recommend you start with a sweep, unless you know where your box peaks at. If you do know, then start a few Hz below and go in 1 Hz steps to a few Hz above with about 1 second or so of playing time on each step.