It's weird that no matter what I try, I end up going back to the HD 650. It is my forever headphone.
I'm down with the kids.....based.
Spent the evening on my HD 6XX. Love it.
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With my ongoing DDR5 EXPO shenanigans I've bought a new temporary B850M mATX motherboard which doesn't include optical out. So it's messed up my very recent audio re-organisation using both optical & USB. So I really wanted to see if I could downsize my audio setup which resulting in spending hours tonight really comparing the K15 & K13 R2R. Honestly lucky to own either and they are both bloody brilliant, but I think since I've bought them I gained a slight appreciation of the K13 particularly driving the TA-66. I remember in a blind test I wasn't always able to tell them apart, so I don't know how much of this is bias, but it does feel like the K13 softens the source in a really nice way. Seems particularly apt with all the new K13's on the forum recently.
So I've ended-up with: USB -> K13 -> RCA to TA-66 & XLR to 4.4mm -> K15 -> XLR to Edifiers MR3. And then boxed up my iFi Zen CAN Signature 6XX. I still have the K15's dedicated controls which are nicer to use, whilst also leveraging the better amp. I can always easily add the USB lead back to the K15 if required.
I think what all this playing around has made me think about, is that when and if I change my audio gear, I'm wondering if it makes sense to have a standalone DAC + seperate AMP + OTL tube amp. 3 boxes instead of 2, but seperates gives a certain freedom. But the other thing I realised is that the K13 even on its own; its good enough. Like the HD 6XX sounds lovely on it. So I'm not sure how much I want to stray into more expensive DACs etc.
One downside is my GPU/TA-66 inteference is back. Even though the TA-66 is now really clean, a quick gaming session gave me a slight interference noise so need to resolve that one again.