how to have a car audio sound off.

In my few SPL competitions it is always best to have the trunk closed.  The object is to create as much sound pressure as possible inside the car.  The meter usually goes on the front windhsield passengers side.  If the air is escaping through the trunk then thats less pressure to hit the meter.  wierd thing you will discover that some bass frequencies cant really be heard but will up the SPL.  Example I had 4 orion extreme 12's in my blazer and with what i consider deep bass notes hit about 129 dbl  but as it higher notes that dont sound that loud to my ears actually took me to about 160 dbl.  as for as charity find a shelter to raise money for or check with the police department and see if they have a community outreach you could raise money for or maybe abused children shelter.  There is always McDonalds house as well but not local.  As for the entrance fee just make it a donation based thing and youll be surprised how much you will collect.  Good Luck !

hey Elpumpe. thank you so much. that will really helpme. now do you kno where i can get a decible reader. does it have to be a  specific one or any decible reader? I dont know how much those wud cost. thank u again .cg

thank you i will search for one . might check local  stores too.cg

thank you. $630. im going to price around and come back to that one.cg

You may be able to rent one.  I was just letting you know the manufacturer name so you would know what to look for.

lmaoooo you guys are funny wall mart has one for 15 bucks ,, its made for car audio man,,,, $630......... lmaooooooooooooooooooooooooooo

http://www.walmart.com/catalog/product.do?product_id=4694329sorry i forgot to post the link thier it is