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It would be difficult to say unless we could compare the exact same ciem in the two different material...like the 4C and 4S. I personally have only have only one silicone ciem and it is my best.
the research is there already, (ear mold acoustics). Different ear mold tubeing has been tested, results compared etc etc.... The suposition that sound is influenced by tubeing is supported..... (a lot of the test work was done by Dr. Mead Killion, owner of Etymotic Research)
The reason the research was done on tubeing wasn't for CIEMs but for objective results for trying to fit hearing loss with hearing aids as best as possible.
Now with digitally tuned hearing aids, the reliance on ear molds, tubeing, venting etc etc is pretty much obsolete.
Either way, the principles are the same, the ground work/research has been done, and it can be found in a lot of audiology texts etc etc. CIEMs have borrowed a lot from Audiology and I think will continue to do so.
But I digress, as I'm talking about ear mold tubes, and folks are talking about Silicone v/s acrylic....
Cheers,
Wizard
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