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Originally Posted by Dutchess of York 
Anybody have impressions of these VS other universal IEMs?
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A very short comparison with my ER-4P.
The differences are obvious:
ER-4P have better clarity, detail and high freq extension. Bass is equally deep on both, but allways more up-front with the SA6.
The sound of the SA6 has more body and weight, and the bass has much more slam and power. The bass has a LOT of power, but it does not interfere with the midrange. Bass in both IEMs is articulate and detailed.
The SA6 have a treble roll-off that makes them sound darker compared to the ER-4P.
SA6 have more PRAT and FUN.
My preference is very much depending on the music.
classical: ER-4P most of the time. Some large orchestral pieces fare well with the added weight of the SA6 though.
Jazz: ER-4P, except when we're talking jazz-rock, then the SA6 win clearly in PRAT. The new ports shifted the balance to 50/50.
Pop/rock: depends, but most of the time the PRAT of the SA6 wins. The treble roll-off is in some recordings more evident than in others.
I am not declaring a winner here. I have no favorite, they are far too different for that. This is more meant to give you a relative idea of where the SA6 stand sonically.
I know Elnero is comparing them with the Shure 500. That should be interesting.