From what I've seen, covering the 80 vent just reduces the low bass and not so much the midbass. So Inks, have you heard both the MK1 and MK2 GR07. I liked the MK1 but couldn't get that treble quite tamed enough withoiut triples which I prefer to not use. Is the Mk2 less peaky and maybe a little better with nuance in general? I suspect that the MK1 hot spot just hit my ears harder than most,
From what i've seen it seems to reduce midbass more than subass. Luckily the vent is behind the driver so it's not a pressure vent and it likely has it's mechanism for sunction inside to avoid damage. I honestly don't think the IE80 is that promising if the ie8 is anything to go by (even reducing the midbass), but I do give benefit of the doubt.
I haven't heard the mk1 in a while. The MKII, forgetting the MKI is a fine IEM, but I think the resonance from before are still there, but lessened or perhaps more balanced by other frequencies, one of the two. Somewhere between 7-9k can get a bit offensive (according to shotgunshane) with a shallower insertion but I have no issue with this as I can insert them deep enough to avoid this. There's a spike higher up at like 10k that adds sparkle, nothing bad. The ever present spike at 6k does make it a bit sibilant, but nothing too offensive imo as long as you keep your volume levels in check. According to Rin pa757 shure tips are good at balancing out the 6k spike without taking much away from the rest. I personally use Hybrids just because they're the most comfortable and i can actually achieve a deep fit them.
Edited by Inks - 11/16/12 at 1:59pm