Like Kipp said, check all your connections. Best to unplug and plug back in with a twisting motion. Check your DVD connections, too. Are you using the optical, coax, or analog outputs from the DVD player?
It is hard to describe a sound and harder to interpret what it sounds like from someone's description. But it sounds like you may have bottomed the driver, or you have a defect in the DVD, or you have a problem with one of the electronics (sub amp, AVR, DVD player). Can you recreate the problem? If you can repeat it, turn off the sub and set your speakers to large. Try it again, but listen closely to the passage that makes the pop. If you hear it from your mains, then it is the DVD, the DVD player, or the AVR. If you repeat it and you only hear it from the sub, then it's time to contact SVS. They will be very accommodating.
It is hard to describe a sound and harder to interpret what it sounds like from someone's description. But it sounds like you may have bottomed the driver, or you have a defect in the DVD, or you have a problem with one of the electronics (sub amp, AVR, DVD player). Can you recreate the problem? If you can repeat it, turn off the sub and set your speakers to large. Try it again, but listen closely to the passage that makes the pop. If you hear it from your mains, then it is the DVD, the DVD player, or the AVR. If you repeat it and you only hear it from the sub, then it's time to contact SVS. They will be very accommodating.



















.








