Today I returned my trial Jabra Enhance aids to Costco and ordered KS10s (after a brief demo revealed nothing surprising).
I had spent a month comparing the Jabras to my “old” KS9s outdoors (bike riding), in restaurants, in a theater, and, over the past several days, in a large fairly reverberant room (high ceilings, hard surfaces, large windows) with 15 people milling about, conversing, kids playing (family reunion), including 7 children, ages 1 to 12 - the 1 year old is a joyous shrieker.
I use power domes at present. I had downloaded the ReSound and Phonak fitting software so I could compare the gains set by the fitter between the two aids. I had taken the Jabras back once to Costco for a fitting adjustment, where, among other things, he significantly boosted the low frequency gain for streaming. After that, I used fitting software to make some temporary adjustments for both the KS9s and Jabras so I could get a sense of what some of the features were doing, for my ears.
On balance, I think I could achieve comparable performance (sound quality and speech intelligibility) with either brand, with enough time spent fitting (even though, as I received them from Costo, they sounded pretty far apart). I had high hopes for the M&RIE receiver, but I really couldn’t tell a difference. I guess I have an “average” pinna, so that the compensation programmed into the behind the ear microphone versions works pretty well. The Jabras do seem to have better windblock. Both the Jabras and the KS9s had occasional (relatively rare) issues with maintaining the Bluetooth connection, depending on the device and the situation.
The big difference for me was my perception of Bluetooth audio quality, particularly streaming music, and the fact that the KS9s and KS10s will connect to my Macbook. It bugged me that I could not understand why music streamed from my Pixel 4a to the Jabras was pretty much unaffected by settings of the 5 band equalizer in the Pi Android music player, but it was significantly affected if I wore my wired Bose Quiet Comfort 15 over the ear headphones on top of the Jabra aids. I thought I ought to be able to get the Jabras to sound similarly to the KS9s, because I enjoy the sound from the KS9s. So digging into the ASHA Android spec https://source.android.com/devices/bluetooth/asha#audio-packet-format-and-timing, I discovered that ASHA is apparently using a G.722 codec G.722 - Wikipedia, which samples the audio signal at 16Khz, and uses up to a 64 kbs data transmission rate over BLE. Digging more into codecs, G.722 is a relatively old codec that was created to allow transfer of “commentator quality” voice on 64kbs channels. It was not intended for music reproduction (see Comparison of audio coding formats - Wikipedia)
Playing with the Pi equalizer, it seemed that the relative “fullness” of music streamed from the KS9 was due to energy in the 120Hz to 460Hz band. My guess is that the G.722 codec in ASHA is filtering out most of the energy there before sampling, which would explain why neither the fitter’s gain changes nor the Pi equalizer had a noticeable impact on making the music from the Jabra more similar to that from the KS9 (which I enjoy).
I did a brief experiment with a bluetooth connection between the Jabras and my iPad, using MFi, and I had the same experience of streamed music sounding “thin” to my ears, compared to the KS9s, but I didn’t go any further to try to see how MFi is implemented
SO (and sorry for going on and on, but perhaps someone will benefit, or respond to improve my understanding of these things), the Bluetooth LE Audio LC3 codec, when it’s finalized and deployed, should be superior (for music) to any of the codecs used by Bluetooth Classic What is LE Audio and LC3, the latest in Bluetooth audio? - SoundGuys. The Jabras seem more future safe in that regard. So maybe I should stay with them and wait for the firmware update. But, my current phone and 2021 Macbook only support Bluetooth 5.0, so I won’t be getting high fidelity Bluetooth LE Audio streamed to them. I’d need a new phone and a new laptop. Android 12 has APIs to support Bluetooth LE Audio profiles, but the phone or laptop would need hardware support for BLE Audio as well. I’ve read that the Samsung S21 that uses Qualcomm’s high-end Snapdragon 888 will support Bluetooth LE Audio, but lower range Snapdragon versions do not. Have no idea what Apple or Google may do in the next product cellphone product cycle. Maybe there will be Bluetooth LE Audio dongles?
Anyway, given my priorities, I decided to just eat the battery drain cost and stick with Phonak for the time being. My KS9s have always had a problem with perspiration entering the 312 battery compartment (I had one pair replaced under warranty so far), so I’ll go ahead and try the KS10s.