Sennheiser HD 660 S2 Open Back Headphones

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Enjoy your music on a completely new level. An intimate, relaxed sound signature combines with outstanding precision and exceptional comfort — and now, extended sub bass — for a deeply moving experience.

“The Sennheisers have a charming smoothness to their sound...” What Hi-Fi


Sale price$949.00

Key features

Comfortable open-back design

Extended sub bass

Natural, warm sound

Frequency 8 – 41,500 Hz

Weight 260g

Sennheiser HD 660 S2 Open Back Headphones

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Sennheiser HD 660 S2 Open Back Headphones

The Sennheiser HD 660S2 Open-Back Headphones represent a refined evolution of one of the most respected audiophile headphone lineups in the world. Designed for listeners who crave detail, depth, and emotional connection in their music, these headphones take everything great about the HD 600 series and elevate it further. With extended sub-bass, improved dynamics, and a smooth, natural tuning, they deliver a sound that feels both intimate and expansive at the same time.

Built in Ireland with premium craftsmanship, the HD 660S2 blends technical precision with everyday comfort, making it perfect for long listening sessions. Whether you're rediscovering your favorite tracks or diving into high-resolution audio, these headphones reveal layers of sound you may have never noticed before. If you're serious about sound quality and want a truly immersive experience, this is a headphone that delivers on every level.

Sennheiser HD 660 S2 Open Back Headphones

Extended Sub-Bass for Deeper Impact

The HD 660S2 introduces significantly improved sub-bass compared to its predecessors, reaching down to an impressive 8 Hz. This means you’ll not only hear the bass—you’ll feel it, adding depth and realism to genres like electronic, orchestral, and cinematic music.

Unlike boosted or artificial bass, this extension is clean and controlled, preserving clarity while enhancing immersion. It transforms your listening experience into something more physical and emotionally engaging.

Sennheiser HD 660 S2 Open Back Headphones

Natural, Warm & True-to-Life Sound Signature

These headphones are tuned to deliver a natural and slightly warm sound that feels incredibly lifelike. Vocals sound intimate and realistic, while instruments retain their original tone and texture without sounding harsh or overly bright.

This makes them perfect for long listening sessions, as the sound never becomes fatiguing. Whether you're into jazz, rock, or classical, the HD 660S2 presents music exactly as it was meant to be heard.

Sennheiser HD 660 S2 Open Back Headphones

High-Impedance Audiophile Performance (300Ω)

With a 300-ohm impedance, the HD 660S2 is designed for serious audio setups, including dedicated headphone amplifiers and high-end DACs. This allows for better control, improved dynamics, and superior detail retrieval compared to standard headphones.

If you already own quality audio gear—or plan to upgrade—these headphones will scale beautifully and reward you with noticeably better sound performance over time.

Sennheiser HD 660 S2 Open Back Headphones

Open-Back Design for Wide Soundstage

The open-back design creates a spacious and airy soundstage that feels more like listening to speakers in a room rather than headphones on your head. Sounds are not confined—they spread naturally, giving you a sense of direction and space.

This is especially valuable for critical listening, gaming, or immersive music sessions where positioning and realism matter. It brings your music to life in a way closed-back headphones simply can’t match.

Sennheiser HD 660 S2 Open Back Headphones

Premium Build Quality (Made in Ireland)

Crafted with precision engineering and high-quality materials, the HD 660S2 reflects Sennheiser’s long-standing reputation for durability and performance. From the vented magnet system to the ultra-light aluminum voice coil, every component is designed to minimize distortion and maximize clarity.

This is a long-term investment product—built not just to sound amazing today, but to perform consistently for years to come.

Sennheiser HD 660 S2 Open Back Headphones

Exceptional Comfort for Long Listening Sessions

Weighing only 260g with plush ear cushions and a well-balanced headband, these headphones are designed for hours of comfortable use. The open-back structure also helps reduce heat buildup, making them ideal for extended listening without discomfort.

Whether you're working, relaxing, or deeply focused on music, the HD 660S2 feels light and natural—almost like you're not wearing headphones at all.

Sennheiser HD 660 S2 Open Back Headphones
“The Sennheisers have a charming smoothness to their sound...”

What Hi-Fi

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