Sennheiser HD 660S2 Headphones

The Sennheiser HD 660S2 is an open-back, over-ear headphone designed to deliver natural, detailed audio reproduction. With high-quality transducers and a balanced sound profile, these headphones emphasise clarity across frequencies while maintaining controlled bass and smooth treble. The HD 660S2 features a lightweight construction and plush ear pads for extended listening comfort, and a detachable cable for easy replacement or upgrades.

Advantages

Open-back acoustics provide a wide, airy soundstage and accurate imaging for critical listening. The transducers are tuned for neutrality and detailed resolution, suitable for both instrumental and vocal content. Comfortable ear cushions and a lightweight headband reduce fatigue during long sessions. The detachable cable adds versatility and simplifies maintenance or customization.

Suitable for

• Audiophile home listening and critical music evaluation
• Studio reference monitoring in treated environments
• Enjoying detailed acoustic, classical, jazz, and vocal-focused recordings
• Listening sessions that prioritise soundstage and imaging over isolation

Key specifications

• Open-back, over-ear design for natural soundstage
• High-fidelity dynamic transducers tuned for a balanced frequency response
• Lightweight headband and plush ear pads for extended comfort
• Detachable cable for easy replacement and compatibility with aftermarket cables

How to use

Connect the detachable cable to a suitable headphone output on your amplifier, DAC, or audio interface. Position the ear cups over your ears so that the ear pads form a comfortable seal without excessive pressure. For best results with open-back headphones, listen in a quiet, acoustically treated or low-reflection room to fully appreciate the soundstage and imaging. Adjust source volume to a moderate level before prolonged listening.

Recommendations

Use with high-quality headphone amplifiers or DAC-equipped sources to achieve optimal dynamics and detail. Avoid using open-back headphones in noisy or public environments where sound leakage or lack of isolation may be undesirable. Store the headphones in a dry place and disconnect the cable when not in use to extend component life.