Are the 'foams' hidden underneath the filter?
Are the foams present in all 'versions' of the RE0?
If so, how is the foam kept from rubbing against the driver?
Once the foam is removed, can it be re-inserted without damaging the driver?
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Are the 'foams' hidden underneath the filter?
Are the foams present in all 'versions' of the RE0?
If so, how is the foam kept from rubbing against the driver?
Once the foam is removed, can it be re-inserted without damaging the driver?

Are the 'foams' hidden underneath the filter? Yes
Are the foams present in all 'versions' of the RE0? Yes
If so, how is the foam kept from rubbing against the driver? The driver itself has a metal grill on top of the diaphragm. Plus, foam is mostly on the nozzle, not touching the driver usually.
Once the foam is removed, can it be re-inserted without damaging the driver? Yes, just be sure to insert it in the same way you took it out.
ClieOS got it in one. The foam really can't travel down the nozzle towards the driver because the volume of the foam expands, so that its pressed against the sides of the nozzle securely. Unless you somehow exert a lot of sudden force by smacking the RE0's really hard, or something strange like that, it's not moving anywhere - unless you put a volume of foam in that is smaller than the diameter of the nozzle.
Changing the amount of foam is reversible, but just be careful changing the filters, because its relatively easy to tear them.
What exactly does removing the foam do?
Basically, the more foam there is in the nozzle, the more bass and mid-bass energy there is, and the less foam there is in the nozzle, the more mid-treble/ treble energy there is. No foam at all makes them sound really sparkly, but almost harsh. Considering that most people consider the default balance of the RE0's pretty good, if slightly bass light, then its probably going to be more preferable to increase the foam rather than decrease it. You might like them just the way they are with the right tips though.
Reduce acoustic impedance, cut down bass and increase treble. It really isn't intended for RE0 but for RE1.
cool, thanks for explaining. I actually like them the way they are right, but I'm always curious so maybe I'll try it just for the hell of it one day anyway. I'm afraid if I add more foam though the clarity will take a hit, and that's what I like most about them
It would dampen the treble for sure. The RE0's made a big splash because they had amazing clarity in their price class, and dampening the treble will take away from that special quality. However, on my pair with more foams its still pretty clear - its just that I was willing to sacrifice a little clarity for a thicker sound. Most of my earphones that I have in my collection have confirmed that for me, so you can give it a go heh
So there is an internal metal grille similar, for example, to the one at the tip of the nozzle on something like the Sennheiser IE8 - positioned some way down the tube in front of the driver and stopping the internal foam from rubbing on the driver? Can anyone confirm this?
Does anyone have a down-the-nozzle picture of this assembly?

So there is an internal metal grille similar, for example, to the one at the tip of the nozzle on something like the Sennheiser IE8 - positioned some way down the tube in front of the driver and stopping the internal foam from rubbing on the driver? Can anyone confirm this?
Does anyone have a down-the-nozzle picture of this assembly?
Internal grill or not, the RE0's come with foam anyway. No one ever complains that the existing foam travels down the nozzle to touch the driver.... if you want to mess around with the foam, just make sure you dont put in a piece that is long enough to reach all the way to the driver. You can use your judgement. :)
No picture, but FYI I had done the foam mod (and reversed them all afterward) on RE1, RE2, RE0, RE252 and RE-ZERO. All of the them have metal grill in front of the diaphragm.

