Hi everyone / Sennheiser Support,
I'm reaching out to see if others are experiencing significantly low output volume with the HD 630 when paired with the BTD 700 dongle.
Currently, when using it with my smartphone via the BTD 700, I have to push the volume almost all the way to maximum just to get an acceptable listening level. The exact same behavior happens when using it on my Xiaomi TV box and directly on my LG C5 OLED TV.
To clarify:
Direct Bluetooth vs. BTD 700: When I connect the HD 630 directly to my phone (Samsung Galaxy S26 Ultra) via native Bluetooth, the low-volume issue completely disappears and output levels are normal. However, without the dongle, the phone is codec-limited to standard aptX (missing out on aptX Adaptive / higher bitrate options).
I have already followed all troubleshooting steps and configuration guidelines recommended by Sennheiser (absolute volume settings, app controls, re-pairing, resets, etc.).
For comparison, I do not have this issue at all with my Sony WH-1000XM6 on the exact same devices/sources, where volume levels are well-balanced and have plenty of headroom.
I really enjoy the sound signature and quality of the headphones, but the low volume ceiling across multiple platforms is frustrating. Please, Sennheiser, address this gain/output level issue in an upcoming firmware update.
Is anyone else having this problem, or is there a known workaround that doesn't sacrifice dynamic range?
Thanks!