A:Answer @Gary, I spoke with Chet at Def Tech customer service....real nice guy. Told me that all of the speakers in the BP9000 line will have this popping noise when the subs first turn on. Essentially he said it was "normal" and would not affect the longevity of the speakers. He also said that replacing the amps would not help. If you're within your return period, and don't like the popping noise at startup, return them. I've tried everything to help with the noise but nope, still present. I love how the speakers sound and will be keeping them though. -Mo