Resonant Frequency of your Vehicle

To test resonant frequency you need a 10'' subwoofer in a 1.0 cubic foot sealed box , place the box in the center of your ride or as close to center as possible with the cone faced toward the back of your ride, test tones /sweeps , amp , and a termlab/spl lab /RTA . play sweeps at around 3/4 volume , find ur peak and double check by using single tones , make sure to keep the volume the same at all tones . this will give you the resonant frequency of your cabin , this is why the same system would sound totally different in a different ride.also if you have a big box you may want it in your car while testing because that can change things , also if you can remove your subs and cover the sub holes in your box with a sheet of wood as they can also throw off the final result .