Open for a quiet room and a more natural sound. Closed for travel or shared spaces.

Do they need an amplifier?

High impedance models perform better with one. Impedance is stated in ohms.

Are ear pads replaceable?

On most series yes, and they are available as spare parts.

Sennheiser

Homepage/Brands/Sennheiser

https://en-us.sennheiser.com/

Sennheiser – Headphones and microphones

German audio company, since 1945

Sennheiser has defined professional audio for eighty years. Its headphones are used in recording studios, not only for listening.

The key distinction in the range is open and closed back: open designs give a more natural, wider sound but leak outward, closed designs isolate. The choice depends on where you listen.

Open and closed back

HD series

Wireless models

Professional audio

What you will find from Sennheiser at Techbox

HD series headphones
Wireless headphones
Microphones
Replacement ear pads

Sound as it was recorded, not as the maker wants it.

Frequently asked questions about Sennheiser

Open or closed back?: Open for a quiet room and a more natural sound. Closed for travel or shared spaces.
Do they need an amplifier?: High impedance models perform better with one. Impedance is stated in ohms.
Are ear pads replaceable?: On most series yes, and they are available as spare parts.