Today I re-attached my old Mogami cable to my HD-598 instead of keeping the Canare. Man, why on earth did I put up with the Canare for so long. I hate Canare!
I can confirm that with the Canare the mids aren't as forward as stock and there's a little added bass and a little extra warmth to the sound, which is NOT what the HD-598 needs.
I think due to the extra bass, this is why the mids aren't quite as forward. The Canare seems to tame the treble too much. It even did this on my old HD-650.
Switched to the Mogami and there's a huge increase in sound clarity and the mids are just how they should be. Yes, with the Mogami I could even say the HD-598 is nearly crystal clear. I couldn't quite say that with it's stock cable. The Mogami seems to offer the best soundstage too. So, can't say it enough, if you want the same signature of the HD-598, but improve it by a ton, use Mogami.
For people who aren't believers of cable upgrades, try a stock HD-598 and one with a cheap Mogami cable. All my other headphone cable upgrades made just minor differences. I'm a believer of the fact that 75% of stock cables are junk.
Stupid me accidentally soldered the cables on wrong. First time I did this. Oops. I also made a Belden cable for my Sextett LP. My Sextett still sounds like muffled crap (bad pair maybe). I could only listen to it for 10 minutes before wanting to switch to the HD-598. I swear my DJ100 sounds like the Sextett LP's signature in some ways. Just better and a lot more clear. I just bought my third DJ100 today. Maybe I'll stop trying to mod them this time.
Tempted to get some Double Helix (expensive) wire and see if it'll improve anything over the Mogami with the HD-598. I highly doubt it. Someone should do this and report back. Come on, I know you want to