I'm wondering where companies are getting these bluetooth and noise canceling modules for use with in-line cables. Are they designing the circuits themselves?
It is essentially a portable bluetooth receiving dac/amp, but im never seeing a single posted measurement or even any discussion about posting measurements. I hardly see anything about chips used, but from looking at the apt-x datasheets they dont seem DIY friendly in the slightest.
At this point I'm wondering if i shouldnt just DIY (or order custom) an IEM 2-pin 0.78mm cable thats only like 1.5 feet in length, and then use a small enough bluetooth receiver or long TRRS microphone cable to provide mic and play/pause.