Sennheiser HD 660S2 Open‑Back Hi-Res Audiophile Headphones, Ultra‑Light Aluminum Voice Coil, Extended Sub‑Bass, 300 Ohm Impedance & Airflow Transducer, Plush Ear Cushions, Premium Comfort, 2Y Warranty

Price: ₹54,990 - ₹29,989.00
(as of Nov 17, 2025 20:00:03 UTC – Details)

From the manufacturer

Sennheiser HD 660S2

Dive deeper into legendary sound.

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. Double the sub bass heightens your listening experience.

Enjoy your music on a completely new level.

How do you one-up a line of legends?

High-end Sennheiser headphones like the HD 600, HD 650, and HD 660S are known for their balanced, natural sound. The HD 660S2 shares this legacy with a revised 300-ohm coil for cleaner impulse response, a compliant surround for lower resonant frequency, and optimized airflow for better sensitivity.

They feel as great as they sound

The velour earpads can only be described as a tactile pleasure. With the right amount of tension for proper acoustic positioning and supple padding, the headband won’t draw attention away from your music, either. As an open-back design, the HD 660S2 gives your ears an extremely comfortable climate.

Natural, non-fatiguing sound for gamers and streamers.

Do you recognize the feeling of listening to harsh sounds that annoy you for long periods of time? The HD 660S2 has been developed for detailed yet fatigue-free treble reproduction to keep you focused all day long. With comfort this good, you’ll be ready to extend your gaming sessions even further.

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Customer Reviews

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4.5 out of 5 stars 2,807

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Price

₹22,989.00₹22,989.00 ₹24,989.00₹24,989.00 ₹29,989.00₹29,989.00

Audiophile Segment
For Audiophiles who want the most affordable entry point to legendary 600 series sound, with slightly more brilliance and less bass For Audiophiles that demand the absolute reference for neutral sound, and want to trust higher quality standards with matched channels For Audiophiles demanding the latest in transducer technology, with superior detail retrieval and bass impact and a warm tuning aimed at relaxed listening

Tuning
Neutral – Detailed Neutral Warm, bass-empathized

Soundstage
Intimate Intimate Intimate

Transducer Damping Material (Optimizes distortion behaviour and finetune the vocal frequency range)
Acoustic Silk (Delicate mesh minimizes air turbulence) Acoustic Silk (Delicate mesh minimizes air turbulence) Stainless Steel Mesh (Tightest tolerances for acoustic impedance)

Openness (The more permeable the material, the less bass and the more clarity is exhibited)
Highly permeable steel mesh results in great clarity at the price of less bass impact Higher resistance steel mesh strikes the perfect balance between clarity and natural bass response Higher resistance steel mesh strikes the perfect balance between clarity and natural bass response

Magnet hole damping (Affects the lowest frequencies in amplitude and distortion behaviour)
Low magnet hole damping with integrated bass tube (Enables great clarity at the cost of bass impact) High magnet hole damping with integrated bass tube (Reduces distortion and smoothens treble reproduction) Undampened magnet hole (Allows the diaphragm to move freely for optimized impulse response)

Channel Matching ( Left and Right audio channel replicatinbg frequency response and loudness)
Yes Yes Yes and refined higher

Balanced Cables Included
X X 4.4 mm included

Impedance
300 Ω 300 Ω 300 Ω

Frequency Range
12 – 40,500 Hz 10 – 41,000 Hz 8 – 41,500 Hz

GERMAN‑DESIGNED, IRISH‑ASSEMBLED – Expertly engineered components from Germany assembled in Ireland, ensuring consistent build precision and quality
EXTENDED SUB‑BASS IMPACT – Redesigned voice coil and optimized airflow double low-frequency output for deep, impactful bass without distortion
38MM ULTRA‑LIGHT ALUMINUM VOICE COIL – Delivers improved impulse response and pristine clarity across the 8Hz–41.5kHz range.You can feel the lowest note on the piano (27.5 Hz) or the kick of the bass drum (45-60 Hz) as if you were there, at the recording studio
AIRFLOW‑OPTIMIZED TRANSDUCERS – Advanced vented magnet system and steel-mesh damping reduce distortion while maintaining tight bass and airy mids
HIGH IMPEDANCE & OPEN DESIGN – 300 Ohm open-back dynamics produce a neutral, relaxed, high-fidelity listening experience ideal for critical listeners
PREMIUM COMFORT FOR ENDURANCE LISTENING – Lightweight (~260 g), velour ear pads, and ergonomic headband ensure fatigue-free comfort even during extended use
SPEAKER‑LIKE SOUNDSTAGE – Designed to recreate the openness and space of high-end speakers, capturing natural sound imaging
INCLUDES PREMIUM ACCESSORIES – Comes with both 4.4 mm Pentaconn balanced and 6.3 mm unbalanced cables plus 3.5 mm adapter for versatile connectivity and carry case
BACKED BY A 2-YEAR WARRANTY – Enjoy peace of mind with Sennheiser’s trusted quality assurance and after-sales support.
SPECIFCATIONS – Transducer principle : dynamic, open,Impedance : 300 Ohms, Frequency response (speaker) : 8 Hz – 41,500 Hz, Sound pressure level (SPL) : 104 dB (1 V), Total harmonic distortion (THD) <0,04 % (1kHz/100 db SPL) Adapter: 6.3 mm (1⁄4 inch) to 3.5 mm, Cable length : 1.8 M