Hello,<br /> This is a situation that occurs with a batchful of MTX Thunder subwoofers which I believe started at the assembly plant. I had a 10" Thunder 7000 (older model) which started making burping sound that sounded horrible. I took it to a local shop and they told me that I had a junk box. The sold me an MTX box and the sub still blurted. I returned the sub and they gave me a new one which sounds fine.
-Jaminlogic<br />Eclipse 8303r<br />Infinity Kappa Components & 3-way<br />MTX Thunder Amps (2)<br />Carver Pre-Amp Processors<br />12" Aura Force<br />Lightning Cap by Rockford Fosgate<br />Wiring by Phoenix Gold<br />Paid $1200.00 for total system.