I thought this was interesting. Polk LSi15 with a 1" tweeter, two 5 1/4" mid-ranges, and an 8" woofer. The top line is a measurment about 6" from the 8" woofer. The bottom line is at the prime listening seat testing the right speaker (the tweeter, two mids, and woofer all playing the test noise) using REW.
At 106 hz there's an SLP dip. Then another about 1.5 x 106 = 160, then about 2 x 106 = 212, then 2.5 x 106 = about 265. Harmonics. Hmmmmm.......what to do. This is without a subwoofer and speaker set to Large.
