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These speaker setup looks very promising on paper - brand name, good looking speaker, THX certification (better than no certification). Unfortunately, listening at low- normal volumes I had some weird static/cracking sound on the left speaker. I said ok, a fluke, so exchanged it for another. The second unit was better on the left channel, but it had popping/cracking (like popcorn) sounds when the subwoofer was activated. I can't pinpoint what the cause was in both situations - is it amp, crossover, something loose in the speakers, who knows.
I spent more time unpacking, setup, and packing, rather than listening to speakers.
I hope you others don't have the same problem. After returning the second unit, I went on the floor to see what they had out, and guess what the Promedia 2.1 they had on the floor had static noises on left speaker too!