Quote:
Originally Posted by Bilavideo /img/forum/go_quote.gif
I think you've found it. I think I just need to go back and re-read where you found it.
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Warner Tech Care, the DIY IEM builder's superstore. It's made by
Dreve. They refer to all of the products for hearing aids/IEMs as otoplastiks. It's expensive though, $30 for 20mL (compare that to nail polish which is about $5 for 15mL).
And I don't think I ever expressed my gratitude to you myself, Bilavideo. Kudos! Without you none of this would have happened!
Now, for my next project I wanted to make an Sonion based IEM. I took apart some Klipsch Custom 2s that I had and was going to use those drivers (manufactured by Sonion) as the midrange and add a woofer and a tweeter to it. Sonion drivers can be purchased from
Colsan Micro which is in the UK. My thought was to make a 6 driver (3 dual drivers), 3 way design using the
4400 as tweeter, the Klipsch dual driver as the midrange, and the
2800 (which is a monstrous beast). The 4400 series is the super tiny dual driver that someone way back in this thread had used as a tweeter, which I would have thought would be a good choice as well.
I reached out to them explaining what I was looking for and this was their reply, which is pretty interesting I think:
"Hi Mark
This is what I have been advised:
We would advise 2015 or 2091i as a woofer and a 2389 as a tweeter. The 2091i is more difficult to drive but has bigger bass. The 2389 could be driven "half coil" to enhance high frequencies [I don't know what this means, can anyone explain?]. The receiver for Klipsch custom 2 earphone is not generic available. We advise to use a 17A003 as midrange instead. (better sounding) In general we would advise to use two way designs over 3 way designs. Designing a good sounding 3 way is very difficult and almost impossible without proper measurement equipment. For a 2 way the cross over network could consist of a simple capacitor (1-2 uF, preferably ceramic type and not tantalum) and some acoustic dampers for acoustic low passing of the woofer. A 3-way is more complicated, one of the reasons being balance armatures are highly inductive and difficult to filter electrically. We would think a combination of 2389 and 2015 or 2091i will outperform a combination of 2015/klipsch midrange/2389 by far.
4400 makes not much sense for musician IEM because of low headroom. It has too high impedance for use as tweeter."
I understand what they're saying about the low impedance, and the 2389 is the lowest impedance driver they make, but the frequency response isn't very impressive, especially when compared to the 4400. Also, this business about them not recommending a 3 way design... I don't know, the IEMs I made are 3 way and they sounds pretty damn good. And I didn't think of this when I was making those, but couldn't you use a cap and a high impedance acoustic filter on the midrange to achieve both high and low pass filtration? Thoughts?