SENNHEISER / HD550 Open-Back Headphones

The Sennheiser HD 550 is an open-back headphone equipped with a 150Ω transducer manufactured in-house in Ireland. It delivers a wide frequency range of 6Hz to 39.5kHz and a natural 3D sound field. Its lightweight design of 237g and velour ear pads provide a comfortable fit, and it also boasts excellent maintainability and versatility with replaceable parts and an included adapter.

■ Equipped with 150Ω Transducers Manufactured in Ireland
- Equipped with 150Ω transducers precisely manufactured at our own factory in Ireland. Covering a wide bandwidth from 6Hz to 39.5kHz, it delivers a flat, natural, and high-resolution audiophile sound without peaks or dropouts.

■ Three-Dimensional 3D Sound Field Created by Angled Arrangement Mimicking Hearing
- Adopting an angled design that mimics the actual auditory system, with transducers angled towards the ear. Acoustically tuned with acoustically transparent dust covers and styrofoam, it creates a wide soundstage and 3D sound field that precisely captures the depth and spatial relationships of sounds.

■ Pure Analog Design Without Reliance on Electronics
- Maintaining a direct analog signal path from source to ear, without relying on electronic processing to achieve the desired sound. Prevents the generation of unnecessary noise and artifacts, delivering a natural, transparent, and pure sound quality directly.

■ Lightweight Design (237g) and Low Clamping Force for Comfortable Fit
• The lightweight body weighs only 237g and features low clamping force (side pressure). The headband combines high-quality synthetic leather with soft foam, and the ear pads are made of plush synthetic velour, maintaining a comfortable fit without pressure even during long sessions.

■ High Durability with Replacement Parts and HD 500 Series Compatibility
• A robust design utilizing the proven HD 500 chassis and high-quality metal mesh earcup covers. Replacement parts such as ear pads are available, and it is compatible with other HD 500 series accessories, ensuring long-term, worry-free use.

■ Microphone-Compatible Design and Accessories for Diverse Environments
• Microphone-compatible design (microphone sold separately, compatible environments) makes it suitable for a wide range of uses, from music listening and movie watching to remote work and gaming. A convenient 1.8m cable, a 3.5mm to 6.35mm screw-in jack adapter, and a drawstring bag for easy carrying are included.


• Product Name: HD 550
• Product Number (SKU): 700455
• Wearing Style: Over-ear
• Transducer Principle: Dynamic, Open
• Transducer Specifications: 150 Ω Transducer (Made in Ireland)
• Frequency Response: 6 Hz - 39.5 kHz
• Nominal Impedance: 150 Ω
• Sound Pressure Level (SPL): 106.7 dB / 1 V RMS
• Total Harmonic Distortion (THD): <0.2% (1 kHz / 90 dB SPL)
• Weight: 237 g
• Cable Length: 1.8 m (3.5 mm plug)
• Earpad Material: Synthetic Velour
• Headband Material: High-Quality Synthetic Leather + Soft Foam
• Earcup Cover: High-Grade Metal Mesh
• Compatibility & Maintenance: Replacement parts available, HD Compatible with 500 series accessories

- Accessories: HD 550 open-back headphones, 1.80 m cable (3.5 mm plug), 3.5-6.35 mm screw-on jack adapter, drawstring bag