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Rhamnetin
172
May 30, 2018
I've had both, and tons of other headphones including top of the line stuff for reference.
Both are great for the price, the K7xx is easier to drive and easier to make sound good. The HD 6XX is very amp picky, not only does it need an amp that can handle a 300 ohm load, but it sounds dull and lifeless out of lots of amps and really needs tubes to sing.
As for your DAC question, only your ears can answer. The lower end DACs I've owned in the past comparable to ones you're looking at, like the Creative Sound Blaster X-Fi Titanium HD and Maverick Audio Tubemagic D1 offered substantial improvements over onboard sound from a computer, but nothing significant compared to an iPhone 6.
Jackula
1743
May 31, 2018
RhamnetinExactly the opposite to my experience. I find the HD6XX easier to drive, many amps will give out the required power of 63mW @ 300 ohms (but actually they need about 63mW @ 500 ohms), even if you're short on power, they still sound very decent and not very picky about amp pairing, heck my HD6XX is very enjoyable out of my crappy Sony phone. K7XX on the other hand needs a lot of current to shine, and yet they are very amp picky and not guaranteed to sound great even when they're optimally powered.
Rhamnetin
172
Jun 1, 2018
JackulaI always found the K7XX (and that family) sound changes less depending on amp than the HD 600 family. Both sound like crap out of any phone.
Jackula
1743
Jun 1, 2018
RhamnetinThat I don't disagree, the K7xx's change less with better amp than the HD6xx's. HD6XX scales better with better gear but K7XX is very amp picky. The HD6XX will sound good on any amp, while the K7XX only synergizes with amps of certain character. The scaling potential on the K7 family is actually pretty decent, I've found them scaling well with end-game amps but not to the same degree as the HD6XX. Crap is what you make of it, for me the HD6XX sounds good out of my phone, the K7XX doesn't.
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