Oh well, now that sounded like a commercial! Let's see now...
I just got my LCD-2's fresh from repair (btw: thank you Alo Audio, what an awesome service! It took exactly one week to send back the cans from UK to USA and get a replacement pair shipped back, for free!)... and thus could try my Toxic Silver Poison cable (pure occ silver), at last.
With my original LCD-2's, I had the "old" stock cable, very thick and stiff. With the new cans came the new (?) stock cable, a very thin and flexible "flat" cable, looking quite cheap tbh.
OK, so on to the Silver Poison cable.
It's the first time I've been using a custom cable in my life, and I'm also quite new to the whole audiophile affair, so please bear with me if what I write here seems stupid.
I had absolutely no prejudice on custom cables, and wanted to try one to see for myself if it really affects the sound.
Well, it does.
Long story short: the Silver Poison gives amplitude to the sound. The whole sound feels more firm and powerful. The instruments separation gets better, and above all, the highs are more refined and present. Overall, it's quite an improvement, except perhaps for the fact that the "extra" bonus in the treble section can emphasize sibilance on tracks very prone to the problem. LCD-2's with the stock cable are almost never sibilant, which makes everything a pleasure to listen to with them. With the silver cable, it can go just the extra bit on those tracks to make the sibilance apparent.
Don't get me wrong: the cable won't magically transform the LCD-2's into bright headphones. It's just that the extra clarity that it conveys on every level can push forward some treble peaks that you didn't get to "feel" with the original cabling.
Is it a good or bad thing, I can't say. Overall, I am very pleased with the new cable, particularly with classical music which I sometimes found a bit underperforming with the LCD-2's because of the narrow soundstage and oh-so-slight (but nevertheless real) recessed treble.
(Some) tracks used for comparison:
Duke Ellington and Louis Armstrong -
Solitude : better texture and imaging on the whole, clearer sound. Extended treble, but the sibilant peaks on the vocals are more present.
Bireli Lagrene - Limehouse blues : far better texture with the new cable, slightly harsh treble peaks on some guitar picks (I mean harsher than with the stock cable. Nothing painful .
Pearl Jam - Of the girl (binaural recording) : Mh... Far better instruments separation and clearer sound, but the extra treble somehow bothered me.
Metallica - Master of puppets : Here, I wander if the slightly "veiled' and muddier sound of the stock cable doesn't work better... Uh, but the custom cable sounds so much clearer...
Austra - Beat and the pulse: again, big improvement on the treble, but I wander if I didn't prefer the muddier sound of the stock cable for that kind of music (electro).
J.S. Bach - Cantate BWV71 : the biggest improvement with the new cable. The voices are much clearer without ever being too much.
Alexander Scriabin - Sonate no 5 (Sviatoslav Richter) : again, clearer sound on the whole spectrum.
Robert Schumann - Violin concert in D minor (Szeryng, Dorati): better imaging, far clearer highs. Magnificent violin.
My very personal and subjective conclusion would be: if you're listening only to metal/electro, you can stick to the stock cable. For everything else, the change is worth it.
PS: Please bear in mind that my opinions might also be influenced by the difference (?) in sound with my "old" LCD-2's which were thorougly burnt in before I got them, whereas those I used for cable comparison are brand new. I have no experience on LCD-2's burn in and its relevance: they may or may not sound "brighter" and thus influence my impressions. I really can't say...
Sound chain: Flac>Yulong D-100>Heed Canamp>LCD-2 rev.2.