I'm thinking about combining the CK10 and ER-4 into a single custom IEM, the CK-4.
In other words, the Knowles TWFK along with the ED-29689.
I have two alternatives in mind, and then sub-alternatives.
a) TWFK + sub-bass driver + super-tweeter.
b) TWFK + ED-29689.
ver.1 - TWFK + ED-29689 working in unison.
ver.2 - TWFK low-end, 29689 high-end.
ver.3 - 29689 low-end, TWFK high-end.
The CK10 and ER-4 are both famous, very good IEM's, so I want to combine them like what happened in the movie "The Fly" from 1986, what do you guys think?