They're both very easy to drive headphones, K5 Pro would be plenty for them. Not sure you'd notice any difference at all. I don't find amps affect soundstage, different headphones are very different and EQ can effect it to an extent but flat solid state amps, no.Hd560s & Philips x3 seems to be wired in balanced way, and balanced cables working, i tried, would i benefit from Balanced Output of K7? Like more details, wider soundstage, cleaner? Could get k7 almost for price i paid for k5 pro, ugh!
I do have a OTL tube amp that I do think subjectively makes the HD600/HD6XX sound wider soundstage (normally these are super narrow, it makes them a little less so, but still not as good as actually good soundstage headphone on solid state). Have never heard a difference in soundstage between solid state amps. This is a very specific pairing, I generally much prefer solid state and almost all my listening is on solid state.
K7 is better but in ways I don't think would make any difference for you on those headphones, it would be more better if you had a headphone that was marginal on the K5. But they're both really easy to drive and K5 is no wimp and plenty of power for them. K7 has better measurements too but doubt you'd actually hear that difference, they're far down.
Volume knob experience is better on the K5, it's not a deal breaker on the K7 but the lag is annoying.
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