I've had a few times (3 or 4) where the sound from my logic7 system loses bass in the front speakers. It sounds like a tin can. In fact, I don't think the woofers are working at all in the front.

Yesterday it did this and I couldn't get it to sound correctly. I turned off the concert hall surround sound settings, turned it back on, etc. Nothing worked.

Then I switched to FM radio. Everything sounded perfect. I went back to my iPod and it didn't sound so well.

I unplugged the iPod and plugged it back up, and finally the sound started working correctly again.

Has anyone experienced this before? I wonder if it's a problem with the radio head, the iPod adapter cable, or my iPod itself (a 16GB iPod Nano).