Sennheiser HME 110 Instruction Manual page 29

Putting the HME 110 in operation
Wear the headset so that the headband runs over the top
of your head.
Adjust the length of the headband so that
– your ears are completely inside the ear pads,
– you feel even, gentle pressure around your ears,
– a snug fit of the headband on the head is ensured.
Final adjustment is best made in a noisy environment.
HME 110 | 7