Play the same tune and take the covers off the speakers and observe the cone. If it looks like it is trying to throw out too far you might just be bottoming out. This will sound pretty much like what you described.
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I did this and yes they were coming out, but it was only happening to the left speaker. Can I reach the low end on just one of the two (I wouldn't think so)? Unfortunately, I was listening to a song on my sattelite, so I cannot reproduce it.
I would think it is more likely that the receiver was clipping, as it is not rated for 4 ohm loads.
Thanks for your help.
Sometimes there will be more low information on one side of the mix, but if you notice that on every song you play that the left speaker is moving that much more then I think something may be going on. Double check the phase to your speakers. I am not sure if this will cause that type of problem but it's easy enough to check. Good luck