davesexplorer 10+ year member
Too much fun.
What some ppl say works for the resonant/peak freq (besides other ppl experiences) is using a general sealed enclosure with a sub, playing a frequency sweep and reading the results, taking into consideration things like the sub/box peak, seats folded, console open, things laying around etc. You can get really nitty gritty, but most people that really want pure spl test, then test, then test again, and again and again.. kinda turns into a job I guess? I never got that into it though. Once you filter out all the other junk, you'll end up getting a frequency that your car "likes", my 2dr exploder for example likes around 48 hz.. dont know why but it does, a 4 door on the other hand would be better of with 50-53hz. The way I understand it this is where all the things in the car, on the car, and the car itself are moving in unison at or around this frequency and creating additional support for the speakers playing the tone. (correct me if I'm wrong)How do i know what my car likes, is there a certain process to achieve this. and also I know most people who do SPL tune high. but i am curious I would like to attempt now to go for the lower notes like 28hz or better yet go for more SQl I don't know man, It feels like puberty again,so many things i would like to do but i don't know what to do.
You can look at response graphs for more explanation, get your vehicle on a termlab and you'll see. Take any normal vehicle, play a tone and not only will you see the big hump where your tone is but you'll probably see a bunch of other humps too. If you take an extreme vehicle in the same way, those little humps will all but dissappear - in an extreme veh. you are essentially making the interior burp friendly...
Tuned high ***** for daily period. I hated when I had my high hz boxes in my truck. If you want daily tune lower and sacrifice the numbers.. that's what I did. (although not besting 150 pi$$ed me off) Or just live with ass sounding bass and tune high. Sorry so long... Others can probably chime in better than I can anywhoo.