
I'd like to give them a try down the road. Looks like Fang has yet another winner. And at the price point very competitive. For those worried about the amping requirements for the HE-6s, this seems to fit the bill.

Got mine in today. Not too much impressions wise yet, but here's some unboxing photos.
Good write-up Rob. This last year has brought about some great monitors. I thing the challenge to define the sound they produce is all the more fun because they do produce so much that is truly enjoyable to listen to with the High End getting just that much better with more entries.

Comparing HE-500 to RS-1, the latter are faster, sharper and have more impactful treble. But I found that it was because they are peaked in the high mids & treble and not really because the HE-500 are deficient. HE-500 have a much richer sound to me- with bass, mids and soundstage much more filled out. I think it is natural to like what we are used to. But give them time and you will appreciate the things that HE-500 add and eventually you might find that the RS-1 are unbalanced- at least I did after spending time with headphones with different signatures.

Comparing HE-500 to RS-1, the latter are faster, sharper and have more impactful treble. But I found that it was because they are peaked in the high mids & treble and not really because the HE-500 are deficient. HE-500 have a much richer sound to me- with bass, mids and soundstage much more filled out. I think it is natural to like what we are used to. But give them time and you will appreciate the things that HE-500 add and eventually you might find that the RS-1 are unbalanced- at least I did after spending time with headphones with different signatures.

Nope,I think just the opposite. Its your ears that have been over burned by the rs1. 

I don't have the RS1 but I have the HF2, for Grado sound. To my ear the HE-500 are more refined and even across the frequency range compared to the HF-2. They, the 500's, do not sound muffled in any way to me and that is not to say that you don't hear this but I am not sure why. I did find that for whatever reason the 500's take quite a bit of burn in and I never experienced this with the LCD-2 or the HE-6 as they took maybe a couple of hours.
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Which has the better mids, the lcd2 or the he500?
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Wow, the LCD-2 seem more full in the mids but the 500's are very neutral and clean. I will have to listen and compare more. The bass is stronger on the LCD-2 and in a way I like the more neutral bass of the 500's as the bass, mids and high frequencies tend to blend better but I really do like both.
RS-1 faster than HE-500?!?
OK, I haven't seen frequency/time response waterfall plots, but from my past brief RS-1 audience, from quick listen to a new and unburned HE-500 and from what I see in RS-1 and HE-500 headphone data I would say HE-500 are faster.
I do concur on "sharper" and "more impactful treble" notion though.

Which has the better mids, the lcd2 or the he500?
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Depends. The LCD2 has a leaner, less forward but more transparent and nuanced midrange while the HE500's is thicker/richer, more forward and has a bloom in the lower midrange that results in a coloration. Both are good, depends on what you're looking for.
My experience was that the HE-6 became smoother with quite a bit of burn-in.
Same...for me the change happened only in the first 15-20 hours though.

Point taken, thanks for the graphs. I only had the HE-500 for a week (and was drunk on music at the time) so my impressions are cursory.