Ive done a few searches for this problem but cant seem to find any relevant threads. I have an Eltax Millenium Power Tower which pops intermittently. Most of the other threads describe the same problem, but usually its when switching the sub on or off, or when listening to loud LF effects. My symptoms seem to occur at random; sometimes it happens when playing at a low volume, sometimes when my Pioneer VSX-C300 receiver has been muted, and it happens with any of the three sources I have connected to it. The sub power has an auto-sense, but this is always on before and after it happens. It maybe worth noting that I have used this same receiver with another sub/speaker set-up with none of these problems. Any help would be appreciated.