as I mention in post above.. I'm having issue with my sub in low or deep base specify in transformer movie, and some random songs with very low or deep base causing the sub to shake and rumble.
placed a mat under the woofer to stop it from moving but didnt stop it from rumbling and making the noise.
I record the sound you can download here to hear if this is normal or not..
I've tried to lower the base and lower the crossover it kinda reduce it but still can hear it clearly...