The Monster Cable power strip much like (although to a lesser extent) the larger units from Monster Cable and several other manufactures provide a source of filtered power, it does not provide any source of stable power. Using a UPS make much difference at this point. You could try it, but if you are already using one of these strips then I suspect that dirty power is not your problem. Even the most basic stage 1 or stage 2 filtering should clean up the power more then enough to rule that out. Look up your model on the Monster Cable web site
www.monstercable.com to see what it's specs are. Make sure that it does have filtering and not just surge suppression. Have you tried other speakers? Does the problem still exist or is it gone when you change speakers. It maybe also that the problem only shows up when driving speakers with 4-6 ohm loads. You will need to check this out, if the unit is still new you may want to take it back and have them exchange it for another to test out.
