THis is directly related to gaining up to 10 - 15 db in your system, i know to find out your cars resonance freq in hz u can either do the 1/2 sin wave or 1/4 sine wave experiment... where u calculate the # of feet from the back of your car to where you feet rest and so its 1138/that number/4 or 2 depending on 1/4 or 1/2 test... 1/4 is more spl 1/2 is more street i think 1138 is speed of sound in feet... now im wonderin if anyone has already tested the freq of a maxima 4th genreation by puttin in a sealed test box and a metre to see which freq gives best spl...... anyone done it ??? im goin for 1 15 dd 9515 sub which shoudl give 155 db if i do it right off of one dei 1100d amp and a capacitor as well as an extra car battery for the amp. LEMME KNOW
ps.. dont msg me back sayin u cant hit 155 db off of one sub like illusions and beamriderz... i know it can be done cuz it has been done like 1000 times jus that ppl down here in van bc arent as experienced in car audio

 

every car has a dif resonance freq.
you are not going to gain 10dB if you hit it
the only way to find your RF is to test, use a computer to generate tones and change the tone until the car starts to shake like a **** (if you have the power, like 1000+W to your subs).

 

NO there is a jump of about 10 db at your resonant freq thats why its the rf, from what i know.... DD 9515D with dei 1100d

 

i got a friend with the 9515, he loves it, but that directed amp will not push that sub nearly to its potential.

you may get a gain of 2 and MAYBE 3 dB, but 10 is insane, that would be equal to instantly tripling the power you have to your speakers. not gonna happen bud, sorry.