I'd love to hear the results of your comparisons of the PowerBook vs. iRiver/DAC. I've recently purchased the 40G iPod Gen 4 and love the sound with my Shure E5C headphones. The iRiver hp120/140 must be spectacular if it significantly betters this. Out of curiosity what were the differences you heard between the iPod and iRiver through the headphone jack?
Thanks and all the very best.
Neville
Thanks and all the very best.
Neville