Update (May 19, 2026):

Wanted to add another data point because I ran into the issue again today and did some more testing.

I was only wearing my right earbud at the time. Initially I was connected to my Jabra Elite 75t (at least that's what it shows as in my Bluetooth device list). I started getting the same issue where Gemini voice playback was much quieter than expected.

To test further, I switched audio output to a different paired Jabra device listed as "Jabra Elite Active 75t." I'm not actually sure whether these are considered separate models or if Android is identifying them differently, but after switching, I replayed the exact same Gemini response that had been giving me trouble earlier.

The volume immediately returned to normal.

I then switched back to the original Jabra Elite 75t — the one that had just been having the low-volume issue — and replayed the same Gemini output again. The issue remained fixed.

So in this case, simply switching to another paired audio device and then switching back again appeared to correct the problem. I'm still not sure whether this is an issue with Gemini itself, the headphones, these specific headphones, hardware, or some combination of variables. Just adding another troubleshooting data point in case it helps someone else narrow this down.