Sound pressure level. Basically who has the biggest doof doof in the car. Who"s subwoofer moves the most air. Of course I always lose, because I balance my system. I dont have a 120 watt front end to a 2400 watt bass. I was quite happy with my 240 watt fronts and 800 watt rear ported subby. Until I found out the back of my wagon did not lock properly....so thankful the people in my neighbourhood showed me this by stealing my system and almost causing a fire by leaving the live wires from the amp hanging in the back.
fear not, hopefully next month I shall ahve a new car with a new system. This one has a budget in the 5k+ area
!!!
Also I have another reason for wearing my sunglasses inside.....they are also wireless headphones for my Ipod and handsfree kit for my phone....I culd be waiting for a call.
Also just for clarification, although my last system was pretty loud, It never got turned up unless I was outside city limits. Always well under the legal limit when in residential areas. Only ever blasted it out at the dirt drags and on the farm. Peeps need to sleep!