|
expand under pressure. First take the doors, this is the place were most people loose pressure. I personally take 1" to 2" wide strips of ¾" MDF and line the outer door skin, if you can double it making the doors re-enforced with 1 ½" of MDF. Once the entire skin is covered I go back over the MDF with a layer of sound dampening material. Once my doors are re-enforced I move to the roof. I take and 2" strips on MDF and treat the roof to the same covering. In most cases ¾" MDF will fit behind the factory headliner and allow it to be reinstalled. Once this is done I re-enforce any other areas were air pressure can leak floors, firewall, snug top sides and roof. Any leaks in air pressure will result in loss in SPL. Now this is where I am going to piss people off and I'm not sorry if I do. This whole outlaw SPL placing the Mic inside the enclosure or the port is stupid. Do you ride around town or listen to our system with your head stuck in a port or in the box. Take the reading in a common area such as the dash, but in a port is basically the pressure reading inside the enclosure not in the vehicle. It takes no skill to build a box, slap a sub in the box and place the SPL mic in and get an extremely high SPL reading. I've seen people take a single 10" sub and produce 160Db or better in the port but you take the mic and stick it on the dash and it reads 130Db. Let's get real. A 30 Db fall from taking the mic and moving it from the port to the dash. That's a big loss. I remember the days when someone stated that it would be impossible to produce SPL readings above the 150DB mark. We now have guys doing 170's. SPL competitions can be fun for everyone but lets make them as realistic and under normal circumstances as possible. Until next month remember "If It's To Loud Your To Old"Ben HusserSSM:SSM-Laynbdy Ben@Streetsource.com
|
|
|
