I bought a eD 15k for my girlfriend but I decided to throw it in my car ('95 Civic Sedan). It's going to be in a 2.5 cu ft vented @ 35Hz running off 480W. Problem is I was concerned about rattling so i decided to visit some car audio shops for deadening.
After talking about some Dynomat the guy started telling me I have one of the worst cars for SPL. He said Civics **** for bass unless you're going hatch, otherwise just aim for SQ. He explained how they've put some excellent systems in Civics and it just wasn't up what they expected even after deadening the hell out of the car. So the guy basically told me my 15" is going to sound like a mediocore 10" at best.
The second shop agreed with the first. He told me I'm going to fill my trunk with a box and I'll get some bass but it won't be worth losing valuable trunk space for travel. He went on about 2 cheapo 12's they installed in a '97 Eagle Talon running 300W would put me to shame simply because of the car. Then he listed other cars like Neons, Sables, any hatchbacks, Contours, etc.. are well designed to be bass traps but Civics, NO. I said so what you're saying is I should sell my Civic?...
The answer was with 1 decent 15" in a box like that you should expect it to get hella loud, move lots of air at you, vibrate the hell out of you ... just don't be too let down when you don't get that in your Civic.
Am I missing something here?