I didn't have any trouble driving my K701's, but I don't use those for portable use (nor do I use the iQube in the office, so it's not a combo I use very often).
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Office System:
HPs: ALO K701, APS V3 K701, APS V3 K501, K501 stock, ALO HFI780, ED9
Amps: WA6 max'd, MAD HD200, iQube
Source: Hot Rod'd Shanling PCD3000A, iPod 5.5G w/ALO Cryo LOD
Wish List:
Zana Deux, Deep Darths
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