I've been conversing a bit with Earl L. Neal, the monitor engineer for the original LiveWires (and now Fidelity Custom Earphones), and thought that some people might like to know some of the information I've obtained.
Firstly, he told me that the drivers in the Fidelity Triples use the same drivers (sourced from Knowles) as the Fidelity Duals, with the addition of a midrange driver crossed over between the other two.
Furthermore, I asked him about the possibility of heat-sensitive tips (like those found on Westone's ear monitors) and here was his response:
Originally Posted by Earl L. Neal
We actually have looked into the flexible tips for the customs. And, being a
monitor engineer, I have had them on my Westones as well some others. My
biggest issue with them is their tendency to deteriorate over time becoming
less and less accurate to the original impressions, especially if you wear
them a lot. I have had my ES3's re-shelled for just that reason. Our lab is
on a constant search for a softer acrylic or a silicone that can be used for
the canal portion, that will have a better shore value and last longer under
extensive wear. We just haven't found that perfect material yet.
Lastly, he apparently has been developing the Triples ever since the Duals were released over two years ago.
FWIW all of his responses were quick and he seems very eager to answer any questions. If I were to order a pair, considering all of the problems people in this thread have been having with the LiveWires CA office, I would most definitely order from Fidelity Custom Earphones (in TN).