I would just put in a test tone CD with individual frequency steps and measure the loudest response.

You should find cabin gain increases greatly at 43 Hz but the peak is around 63 Hz.


Anthony B. Davis 2Deep2 Silver SVT 2002 IASCA SQ Ult Ama 601+ World Champion runner up 2002 SLAP dBQ Champion 2000 USAC SQ World Champion 2002 USACi SQ World Champion