So I installed a set of MM6501 in the front of my car and MM651 (coax) in the rear. The coax sound great. The comps are giving me a hard time. At lower frequencies, not sure the exact numbers, less than 150 Hz I hear this vibration or rubbing from the woofers. I pulled the door panels off to make sure they weren't hitting the door. In fact I pulled the speaker from the door, held it in my hand with no mounting hardware on it and it still made that noise. It sounds like it is from between the cone and spider. I carried the speaker to the amp, ran a fresh short wire from the amp to the speaker and the same noise happened. I tried with each channel and it happened.
I am pushing them with a 5 channel Boston Acoustics amp at 2ohm, upwards of 100w per channel. I ran all new wires to the speakers. I am running speaker level inputs to the amp, well was. Now I have a line out converter that didnt help much. The amp gain is turned up 1/3, and the high-pass crossover on the amp is around 65Hz.
Suggestions? O this is the second set that has done this to me, so it is likely something on my end.