I was running an HTC M7 with the Fiio E17 amp which worked really well. I've just taken delivery of my Fiio X5 which I'm using with both Grado SR325is and B&W P7s. I've not had the player long enough yet to carryout a review, but I can tell you there is a notable improvement in sound quality...

Excellent. Thanks for your help. Cheers.

Thanks for your reply. I really appreciate it.

This really helps me out. I've been tearing my hair out over-researching DAPs. I'm looking to drive either my Grado SR325is or my B&W P7s. Do you reckon that I'd need a separate amp (Fiio E12 for example) to driver either or these, or will the on board amp be sufficient? Ta.