I see. Do we have any impedance values out of those tests? Do you think the CX500 can still be considered good for an iPod, so that we can rule them out as the cause of the "poor" sound I am hearing (and assuming the problem is not me expecting too much)?

Anyway, I have some good news. After the update to 2.0.1 (yesterday), it seem to me that while the volume is still as low as before, sound seems slightly more dynamic. I wonder if others are experiencing the same.

Also, today I tested my sennheizer on the Zune 30 I mentioned in my earlier post, and I can clearly perceive a relevant difference in low frequencies and volume.