Sorry to bombard with posts, but I just found out something awesome. I thought I'd try the medium pfe112 silicon tips on the er4s. They aren't super tight on the nozzle, but they fit reasonably well. However, when you put them in your ears they fit more like normal earphones..... Until you push harder. They squished down into my eardrums and sealed perfectly. I'll probably be careful pulling them out a few times to see how they grab, but otherwise, the sound is almost identical to the triple flange, they sit fairly deep and they are 10x more comfortable.
I think the main issue I have with all the stock tips is that they all leave the point of the nozzle or tip at a fairly small size which causes them to poke and be irritating. I've been unusually sensitive tonight, hence trying the pfe tips. If I hadn't pushed a little harder I wouldn't have know they could actually go in deeper. They don't even require spinning or ANYTHING. Just push them in until they stop and then push a little harder and they slide into the canal. They're soft enough that it actually doesn't even feel like much is in your ear. Check it out...
Pretty deep and sound perfect. I'm amazed. Soooo comfortable. Wow, I wouldn't want someone to buy them and find they don't fit in their ears or they're loose or something, but I highly recommend trying them if you want the same sound AND comfort. They have the bass quality of the triple flange super deep and the nice open treble.
I'll use them for a while and see if the frequency response seems any different, but right off the bat my impressions are excellent.
(for what it's worth, i may have posted in the past on using the pfe small tips, but they ultimately didn't work out. I never thought of forcing the medium tips in. These are medium tips.)
EDIT: The bass is actually better with the pfe tips. I almost feel like i don't need any eq. They spectrum might not be identical overall, but it's a slight difference and just a smooth. I can't pinpoint where the difference is. I think it might be that there is a bit more midbass. However, there is no masking of details, so I'm not sure. It just sounds slightly... different... More reports later...
DOUBLE EDIT (oh my goood!): I "think" there's something slightly different somewhere in the spectrum (very small), but here is the difference in bass. I used the first eq with the foam tips. I'm using the second eq with the pfe tips to get the same sound. It might not be too far from a really deep triple flange, but those don't feel good enough for me to get that deep.