My best guess at the resonant frequency of the cabin of the 6th gen(97-03) GP's.

I'd venture to say ~45 Hz based on this:









I personally hate how ~40 Hz is so much louder than everything else but this is in a sealed box already... Perhaps one that is too small.

Those SPL numbers on the right arent really accurate but you can pull the numbers from the graphs. Those are correct numbers within at least 3-6 dB I'd say. Hard to tell with these cheap rat shack meters.

thank you for this info

Not a problem.

Last three graphs are with music and the first scan in blue is there as a reference.

Amp didn't like me... started to get pretty hot. Sub was the same temp as everything else in the trunk

Ok now would this change form the Coupe to the Sedan?