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SENNHEISER

HD 660S 2

Headphones

Open-back audiophile headphones, extended sub bass, warm natural sound, 300-ohm impedance, lightweight comfort, precision dynamic drivers

$799.95 CAD
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Description

The Sennheiser HD 660 S2 is an open-back audiophile headphone created for listeners who value natural sound, long-term comfort, and exceptional detail. Designed to deliver a warm and immersive listening experience, the HD 660 S2 combines precise audio reproduction with extended sub bass that adds greater depth and emotion to music without overwhelming the balance of the sound. From intimate vocal recordings to orchestral arrangements and bass-heavy genres, these headphones provide a spacious and refined presentation that keeps every note clear and engaging.

Built with a uniquely vented magnet system and an ultra-light aluminum voice coil, the HD 660 S2 offers fast, accurate response with impressively low distortion. The open-back design creates a wide and airy soundstage while plush velour ear cushions and a lightweight ergonomic fit make extended listening sessions comfortable and fatigue-free. Crafted in Ireland with premium materials and attention to detail, the HD 660 S2 is suited for dedicated music enthusiasts, home listening setups, and critical audio sessions where comfort and sonic accuracy matter equally.

The package includes both 6.3 mm and 4.4 mm cables, a 6.3 mm to 3.5 mm adapter, and a carry pouch for convenient everyday use. With its balanced tuning, deep low-end extension, and inviting character, the HD 660 S2 delivers a listening experience that feels detailed, personal, and effortlessly enjoyable.

Features

Extended Sub Bass
Delivers deeper low-end sound for a fuller and more immersive listening experience.

Natural, Warm Sound
Creates a smooth and balanced sound signature that feels detailed without becoming harsh.

Open-Back Design
Provides a spacious and airy listening experience that makes music feel more lifelike.

High Precision Audio
Reveals fine details and clarity in vocals and instruments for a more engaging sound.

Low Distortion Performance
Keeps audio clean and accurate even during complex or dynamic music passages.

Comfortable for Long Sessions
Soft velour ear cushions and a lightweight design make extended listening easy and comfortable.

Premium Build Quality
Designed in Germany and made in Ireland with durable materials and refined craftsmanship.

300-Ohm Driver Design
Delivers responsive and controlled sound with excellent detail and dynamics.

Balanced and Standard Connections
Includes multiple cable options for flexible listening setups.

Complete Listening Package
Comes with cables, adapter, and carry pouch for convenient everyday use.

Specifications

General Specifications
Device Type: Open-Back Dynamic Headphones
Ear Coupling: Over-Ear
Design: Open-back
Sound Signature: Natural, warm sound
Country of Origin: Ireland

Driver Specifications
Transducer Principle: Dynamic
Transducer Size: 38 mm
Magnet System: Vented magnet system
Voice Coil Material: Ultra-light aluminum
Impedance: 300 Ω

Audio Specifications
Frequency Response: 8 Hz – 41.5 kHz
Sound Pressure Level: 104 dB (1 kHz, 1 Vrms)
Total Harmonic Distortion: <0.04% (1 kHz, 100 dB)
Sub Bass Performance: Extended sub bass
Impulse Response: Excellent impulse response

Comfort Specifications
Ear Cushions: Plush velour ear cushions
Headband Design: Ergonomic padded headband
Weight: 260 g

Connectivity Specifications
Connector Type: 6.3 mm jack plug, 4.4 mm balanced plug
Adapter Included: 6.3 mm to 3.5 mm adapter
Cable Length: 1.8 m

Magnetic Specifications
Magnetic Field: 4.5 mT

Included Accessories
Cable: 6.3 mm cable (1.8 m)
Cable: 4.4 mm balanced cable (1.8 m)
Adapter: 6.3 mm to 3.5 mm adapter
Carry Case: Carry pouch

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