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Woot and thanks for the clues, you've confirmed some of my suspicions.
Plan A was to just make some straight-up tips: pack the goop around earphone, stuff in ear, and cut away everything forward of the IEM's nozzle as shown in the Make post. Plan B was to extend the goop forward of the nozzle, with some kind of straw in place.
I'm going to use some UE phones for this experiment, and their nozzles are extraordinarily large, so one of my big concerns was that I might not have enough material lining all sides of the nozzle to pull the IEM out of the Radians-stuff without breaking the Radians-stuff. Another big concern is that the nozzles on the better UE phones have a couple openings, and a straw that doesn't line up perfectly could end up partially or wholly blocking one of them. So I might just pack enough goop around the nozzle to seal things off, and then drill out a hole for a straw afterwards. We'll see.
I think Plan A makes the whole idea slightly redundant at least in terms of increasing sound quality, as I thought the point of customs was to eliminate some early sound reflections / interactions between the sound waves and your ear canal by providing a smooth channel deeper in towards your ear canal.
Your second Plan B is something I thought of but you actually want to be confident that when you put the IEM in your ear to make a seal you straw, or whatever material you use, doesn't make it awkward to insert or make the Radians goop not actually fully enter your canal.
The last thing you suggest is what I actually ended up doing, but the risk there is: as you drill down the tube surrounded by goop you don't know if you are just about to actually drill right into the nozzle! I used a screwdriver to do it slowly but the Radians goop's consistency meant that the screwdriver really ended up with a ragged edge. If I had to do it again I would have used a power drill.
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Hmm, this is a good idea. I once bought the monster super tips demo sampler and when I returned it I forgot to put the red rubber tubes back in the box so I have a ton of those. Honestly though I think the tubes inside the flanges in Iem's are much to thick as far as sound bores are concerned. I bet the thinner tubes in mechanical pens and pencils are a better bet.
I'm wishing I hadn't blindly thrown away my old ety foam tips now, those tubes would have been perfect. I guess I'll just take the tubes in my spare mushroom tips out.
I think the "cores" in foam tips are an even better bet for use as makeshift sound bores.
THose little red rubber tubes are awesome, and I use them on some of my IEM's even just to ensure and even more secure fit, like over the nozzles of my SM3. I use them in my custom 252 experiment but unfortunately they aren't actually long enough to reach down to the nozzle.
I'm sure inner tubes of IEM tips would work but most of them are far too thick a bore, except maybe the cores of Etymotic flange tips? I'm not too sure about using straws or anything with hard plastic since the resonance of that material may be unpredictable.
The shape of the bore itself has a lot of effect on the sound. Consider how Audio Technica is taking the idea of a horn nozzle and running with it. It certainly seems to work to increase bass frequencies in my CK90Pro, I took it out for a listen again yesterday and my jaw dropped because I forgot it offers more bass than the SM3 haha. SPeaking of which, has anyone here heard the CK100Pro yet?
