I’m trying to find a solution for streaming bluetooth to an iPhone 15, as well, and coming up short so far. One issue, even if you got it working, is latency. Bluetooth latency doesn’t matter so much when listening to music but, when you want to use it in a performance, you may be introducing enough latency to throw off your timing. That’s gonna be a personal thing, but it’s best to keep in mind that any sort of computer-to-human interfacing will do that. You also might run into radio frequency interference issues, as well as distance since bluetooth has a super short range.
Caveats aside, and having used in-ears before, a wired solution should work, if a little kludgy; You’d basically have the following components:
- An in-ear beltpack
- A cable to connect the beltpack from whatever connector it uses to a TRS; TRS size will depend on your interface inputs.
- A small, portable battery-powered USB-C audio interface with a stereo audio input
- USB-C cable (if not included with the interface)
- An iPhone 15
- An app for receiving/streaming the audio to your hearing aid
- Hearing aid connected to the iPhone (this is the part I have no experience with, and can’t help with)
As for interfaces, a Zoom AMS-22 or U-22 may work; M-Audio might also make one, the caveat being that, because it’s often for stereo audio you’ll ideally need a stereo input to ensure audio staging/panning is still accurate; If your mix is mono that may be avoided, but that’s not been my experience so I’m assuming stereo panning is a requirement.
The short of it is that you’re connecting the belt pack to the adapter cable, running that into the audio interface, and then connecting the interface to the USB port on your phone. I don’t know about the audio software component but, if the interface doesn’t provide something, you can try looking at AUM. It’s reasonably priced and works really well as an onboard audio mixer with latency and buffer controls to help minimize both, plus it can add effects if you want.
Hopefully that helps get you in the right direction; It’s definitely an interesting problem to solve and, even if this doesn’t work exactly as described, I hope it helps you find a solution that does work for you!