Sennheiser HD 4.50 BTNC

The official HD 4.50 BTNC/HD 4.50R manual says to detach the pad by pulling it away from the earcup and attach the new pad by inserting its fixation band into the earcup space. The seal claim is supported; no separate ANC-performance claim is established.

Official listing identifies genuine HD 4.50 BTNC replacement earpads, part 507240, supplied as a pair; it explicitly lists HD 4.50 BTNC compatibility and says the pads help restore the original feel and acoustic seal.

Sennheiser’s service catalog identifies the exact HD 4.50 BTNC model and lists its earpads as article 507240.

Brainwavz’s separate product page explicitly lists HD 4.50 BTNC compatibility for its real-sheepskin-leather and memory-foam variant.

Brainwavz’s own product page explicitly names HD4.50BTNC among compatible models and presents these as its replacement earpads.