When I pair my hearing aids, it means my wife’s headphones get knocked down to SBC codec (it only transmits as fast as the “slowest” device), so we both get a little bit of lag. That being said, I’m seeing if I can get my hearing aid molds re-made with smaller vents (for less feedback) so that I can use the headphones. I didn’t really notice any lag with the headphones, but if I pay attention, I definitely notice the lag with my hearing aids. I used to have CIC hearing aids and wore Avantree Aptx-LL headphones and there’s definitely a difference versus streaming through my hearing aids. But yes, there is a little bit of audio delay compared to headphones that support AptX-LL. The hearing aids pair well–once initially paired, I just have to flip on the transmitter and they connect. I use the Avantree Oasis Plus and the Avantree Priva III (older model, no longer sold) with my hearing aids (Phonak P90s). ![]() I expect (but do not know for sure) that Phonak’s AirStream is a transmitted signal similar to that from the Oticon adapter that operates in the same unlicensed band as Bluetooth (and WiFi) but is not a true Bluetooth signal but rather one that controls latency better than standard Bluetooth and works with what Phonak has implemented in the hearing aids. Similar to the Phonak adapter, the one from Oticon is much more expensive than a standard Bluetooth transmitter with aptX LL. Oticon also specifies the audio bandwidth - it cuts off at 10 KHz which is fine as most hearing aid receivers don’t output much above that. So if you want better control of latency and, in the case of Oticon, a longer range connection with fewer dropouts, you use the Oticon device rather than a 3rd party device that doesn’t implement the special, non-Bluetooth, mode. As far as I can find, Oticon aids do not support aptX Low Latency and I haven’t read anything that claims Phonak do either. It depends on the input type: 25 ms for analog line level, 28 ms for digital optical (PCM) or 45 ms for digital optical (Dolby digital). ![]() Oticon specifies the latency for their device measured from the input to the Adapter to the output from the hearing aid speaker (receiver). One is a Bluetooth signal and the other is a higher power (21 vs 4 mWatt) non-Bluetooth mode operating in nearly (but not exactly) the same frequency range and uses frequency hopping spread spectrum (as does Bluetooth). I don’t use Phonak aids but rather Oticon - the FCC testing shows two different transmitted signals from the Oticon TV Adapter 3. You might try to look up the Phonak TV Connector at the site that has the FCC testing results. They don’t actually mention AirStream but I think that is only a word that is used so they can increase the price.
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