First of all: big thanks goes again to Charles from Burson Audio for providing me a pair of V6 Classic Dual samples!
They're still a week old so they aren't properly burned in, so it is just an initial quick comparison. The soundcard they are in is a Sound Blaster ZxR, i used it with half a year with Burson V6 Vivid Duals in the I/V and V6 Vivid Singles in the buffer. About 2 months ago i put the JRC 2114Ds back into the I/V stage and listening to it since. The constants are the soundcard and the V6 Vivid Singles in the buffer stage, so when i'm comparing them the changes will only come from swapping the I/V's opamps. I'm using the card with the latest driver under Windows 10, all sound enhancing features are turned off and in stereo out, musicplayer is foobar2000 with WASAPI (Event) out.
First impression is (/was that even after 1 day of usage) the sound is a bit gentler with Classics than with the JRC 2114D and V6 Vivids, even with jrc 2114d sound was piercing somewhat piercing. Somehow there is less sibilance, easier to listen to it, gentler presentation on the higher freqencies, the Vivids are more like i am here listen to me, listen to me now
Classics are fuller / slightly fatter on the mids, more upper bass / lower mid punch, don't know if because the burnin period, but a Vivids have more lower bass attack, also cleaner mids, though the Vivids have a slightly more upper range emphasis, which can be a good or bad thing, depends on the speakers/monitors too. Even with the Classics maybe with the Vivids in buffers "magnifies" some HF vocals a little too much, or these Edifier R1900TII speakers can handle the Vivids propery, but i'll wait and will see how will it change after lots of usage. I think male vocals sounds better on Classics. After 1 week of usage it is clear that the JRC 2112D hides lots of small things which doesn't seams much because if when we don't know about them, then we don't miss them, but revealing those (sometimes smaller) details can bring smile on my face
Like revealing some vocals in the background, or how some vocal travels and leaving fading trails, or some instrument for example a distored guitar suddenly became more noticeable and clearer so i can't help but look that way.
Will update later.
12.08 Update:
Put the V6 Vivid Duals back into I/V sockets replacing the Classic Duals. The Vivids are definietly more bright and more cleaner, it punches lower, even on a 5 inch speaker you can tell the difference. Classics are a bit mellow-ish, easier on the ears, tamer highs, slightly more focus on the upper bass and low mid. Male vocals get more body/presence on them, while on the Vivids female vocals gets more clearity.