Sennheiser 502874 Instruction Manual page 24

Activating/deactivating the dynamic bass boost
You can activate or deactivate the dynamic bass boost on the transmitter
or directly on your headphones.
To activate the dynamic bass boost:
Press the BASS button
on the transmitter.
The BASS button is backlit in green.
2
¾
on the headphones or the
¾
Using the RS 170
BASS button
23