runswithaliens:
To add to pekingduck's response... the balanced cable does open the soundstage and adds separation of the instruments. In this respect you'll find that with a single ended cable the soundstage seems narrower than with the balanced cables. The sound also becomes less tube like. Though, not in a bad way. The sound is still decently smooth compared to the single. But balanced adds clarity to the full range (top to bottom). There are times when I switch back to listening with a single ended cable. Oddly those are the days when I just want to listen to a smoother/subdued sound, that the single ended cable provides.
At one point I had thought that the right channel was sounding a touch more sparkly than the left. But now it doesn't appear so. Sometimes I do find myself repositioning my headphones (HD650) because I'm sensing some imbalance. Not a great annoyance and may just be due to the increased soundstage. In the beginning I discovered that the balanced cables I'd ordered had been wired backwards on the left channel cable (reversed polarity). So when I plug the left channel into my headphones I have to make sure and orient the "L" on the headphone plug inwards, towards my noggin'. Unlike the right side, of which the "R" faces outward.
I've swapped out the Infinity caps upgrade for some Ampohm caps. I found the Infinity's were a smidgen too laid back at the high end. I perceived it like a high-end roll off (though I do listen with HD650's which some say, or have said were rolled off or dark sounding, personally I don't think so). I experimented with bypassing the Infinity's with some Russian teflons. Argh... big mistake. They certainly brought sparkle and bass bloom, but they really messed up the nice mid-range detail the Infinity's had. Bad caps... bad bypass caps. The Ampohms, on the other hand, turned out to be a real cure for the high end roll off. Wonderful, wonderful mid-range clarity and texture with a bit more high-end reach. When I first installed the Ampohms they were bright and brittle... let's say they had a transistor radio type high-end (well that may be a slight exaggeration). I thought "Oh crap, another stupid mistake". After about a half hour the brightness was gone and they've since mellowed a lot more and just work lovely in the Jade... at least I like 'em. I love their reproduction of the mid-range. Not as tubey as the Infinity's but more balance overall.