Sennheiser HD 25 - Foam Disks 1 Pair of foam discs for ear pads HD 25

Sennheiser HD 25 Foam Discs (1 Pair)

The Sennheiser HD 25 Foam Discs (Article Number: 034333) are official, factory-original replacement acoustic foam inserts designed specifically for the legendary Sennheiser HD 25 monitoring headphone series (including the HD 25 Plus, HD 25 Light, HD 25-1 II, and classic editions). These round acoustic discs sit directly inside the ear cups, positioned beneath the vinyl or velour ear pads to protect the underlying driver elements.

As a crucial original equipment manufacturer (OEM) maintenance part, these discs are a staple in the gear bags of DJs, broadcast engineers, field recordists, and live sound technicians looking to restore their headphones to factory-fresh acoustic performance.

Key Architectural and Acoustic Attributes

• Acoustically Transparent Calibration: Fabricated from a highly specialized, low-density open-cell polyurethane foam, these discs are mathematically tuned to the exact acoustic profile of the HD 25. They protect the driver without filtering, muffling, or coloring the headphone's signature punchy bass, clear midrange, and clinical high-frequency monitoring response.

• Driver Protection Barrier: The primary physical function of the foam disk is defense. It acts as an internal shield that catches hair, skin flakes, dust, and traveling debris, preventing foreign contaminants from passing through the driver grille and rattling against the ultra-sensitive transducer diaphragm.

• Moisture and Sweat Mitigation: During long DJ sets in hot clubs or intense field recording sessions, these discs absorb microscopic vapor and sweat droplets before they can collect on the internal electrical elements, protecting the voice coil from premature corrosion.

Technical Specifications Matrix

Maintenance and Installation Guidance

Swap Pads and Discs Simultaneously: Over months of heavy field or club use, acoustic foam naturally breaks down, loses its springiness, and absorbs skin oils, which can slowly alter the high-frequency response of your headphones. For the best acoustic and hygienic results, it is highly recommended to swap out your internal foam discs whenever you replace your external ear pads.

Tool-Free Installation: Replacing the discs takes less than a minute. Gently peel off the twist-and-snap or friction-fit outer ear pads from the cup housing. Lift out the old, compressed foam disc, clean any accumulated dust from the driver rim using a dry microfiber cloth, center the fresh foam disc over the capsule grille, and firmly re-seat your ear pads back into place.