Thanks! Your impressions are interesting.
I'm currently using both headphones through the RME ADI-2 DAC to a V280 via balanced. The LCD-XC has a balanced connection while the HE-560 is using the single ended one while I wait on a balanced one to drive them more adequately. I think the HE560 will sound more dynamic once I have the balanced cable to be honest. At the present moment, my own impressions are that the HE560 sounds flatter except for some occasional peakiness in certain tracks that I listen to, which it is also known for around the 9k to 10k hz frequency range. I knock about 3db off this range and everything is fine and I can listen for hours regardless of track. I find it's presentation more to the polite or "softer" side of things. It's quite apparent to me when switching between the LCD XC and the HE560 on the same songs. The LCD-XC seems more coloured and according to the FR curves, has a sort of "W" shape, but it's coloured in an appealing way for me. Between the 2, I find the XC has a fuller note, warmer/enhanced though exciting bass that has a longer decay, slightly drier but more distinct mids and a sort of clarity that is more apparent. It's resolution seems sharper and layering sounds better. Though slightly dark sounding, it's punchy, dynamic and energetic. The XC by the way is the latest creator's edition. The HE560 by comparison feels like a gentleman beside the more "athletic-sounding" XC. It's bass also hits well and goes deep, but its decay sounds shorter as in by the time I get to the perceive the note, it's almost gone. The bass also feels more neutral to me and being an open back, it does sound airy, though it's interesting that the XC doesn't sound that much more closed-in even though it is not an open back. HE-560 seems to have a softer and more polite attack compared with the XC. Another thing I noted in my listening impressions are that the HE560 deliver a more defined instrument separation through slightly thinner note production compared with the LCD-XC. Listening to string quartets, I find the HE560 to produce a "sweeter" timbre which I prefer compared to the XC. The "sweetness" is akin to the sound coming off a violin that is made from well-aged wood, with a very seasoned sound with richer overtones/harmonics, compared with that of a violin made from younger wood that still has room to age from the XC, that sounds slightly more "shouty" at times, slightly hollow, though still with a believable timbre. Personally, I also find vocals in this range, typically the airy/female type to be more realistic on the HE560 than the XC. The XC though it excites my auditory senses, does get slightly fatiguing after a few hours. So for the moment, I'm using the HE-560 more for classical generally, whereas the XC for other modern genres.