I'm using Onkyo's HTiB HT500 speakers connected to an old Sony STR-D615 receiver. I only have the two fronts connected at the moment (for music listening), and the left one is giving me pause. Compared to the right one, its bass response is pitiful and the bass it does put out is cracked and "splatty." Swapping the speakers between channels on the receiver yields the same result. The best explanation I can come up with is a damaged lower driver in the left speaker. The good news is Onkyo has a 2 year warranty on these and I've only had them for a month. Before I send them in, does anyone have any suggestions or has anyone had a similar experience with these speakers?