Ritvik
Forerunner
Horrible build quality............beware
Yeah, 3 of the RE-1 IEMs failed on me, a RE-262 and one RE-400 after I sold it to another member on TE. The RE-1s were all failed drivers, I'm still open to buying a used pair! That's how good they were, probably my most loved piece of audio equipment I've owned. The RE262 and the 400 might have been cable issues.
Here's another reason
https://www.facebook.com/HiFiMANElectronics/posts/707688969327896
Vesper audio has done some impressive HiFiMAN recabling work(none detachable though). But I do see a sweet detachable ortofon. Maybe ask them if it is possible.
BTW, How different are they from the RE400?
Thanks for the link! Its a good option should the cables fail. Are you aware of complete driver failure with the RE600? Very tempting at BF sale price. Don't think the sale has started yet though, everything seems to be at normal rates on the Head Direct site.
It's been a while since I heard the RE-400 and I'm also now on a vastly improved source these days, so comparisons might not be just. The RE-600s had very tight bass, I wouldn't confidently say more quantity than the 400 but feels more precise. However, this extra control at the bottom end is something I also noticed with both my CIEMs after switching from the AK100 direct (or ALO International) to the GloveAudio A1, so I'm not sure if its solely the RE-600 or if the source plays a significant part here. I like the mid-range on the 600, its quite close to the 400, but not as buttery as the RE-1. Still, it seems to be the focal point of this IEM and would standout as a strong point. The treble is perhaps a bit more in line than the RE400, without losing out on any detailing. Should have tried running it balanced as well but didn't have the time, the differences however aren't always noticeable.
P.S. - If I were to give up all the restrictive criteria what would be the closet I could get to the old Head Direct RE-1's sound?