Sennheiser HD 450SE Instruction Manual page 33

FAQ/If a problem occurs ...
When using the analog audio cable, the music only plays on one
side of the headphones
The jack plug of the audio cable is not properly locked in place in the
headphones' audio socket:
1. Insert the 2.5 mm jack plug of the audio cable straight into the
headphones' audio socket until you feel a resistance.
2. Turn the 2.5 mm jack plug to the right until you feel a resistance.
The jack plug is now locked in place and the audio cable is cor-
rectly connected to the headphones.
3. Insert the 3.5 mm jack plug of the audio cable into the audio
output of your smartphone.
The Bluetooth connection is deactivated.
OFF ON
Right R
2.5 mm
3.5 mm
Audio cable
HD 450SE | 33