Sennheiser HD 660S2 wired headphone with open-back over-ear design, featuring plush velour earpads and dual detachable cables.
HD 660S2 headphone transducer with 300-ohm voice coil and new diaphragm for deep bass and improved airflow for linear sound.
Sennheiser HD 660S2 built with ergonomic headband, velour earpads, and metal mesh earcups for premium comfort and durability.
Man wearing HD 660S2 wired headphones, showcasing wide frequency range and deep sub-bass for audiophile-level sound precision.
Sennheiser HD 660S2 open-back headphones connected to audio interface, delivering spacious, natural soundstage for immersive listening.
User holding HD 660S2 headphones with 42mm transducers, engineered for accurate sound reproduction and minimal distortion.
HD 660S2 headphone box contents including 6.35mm and 4.4mm cables, adapter, and storage pouch for versatile wired connectivity.
Woman enjoying HD 660S2 headphones with soft velour earpads and open-back design for all-day, fatigue-free comfort.
Close-up of HD 660S2 headphones highlighting durable OFC cables and replaceable parts for long-lasting performance and reliability.
Gamer wearing HD 660S2 headphones in a vibrant setup, benefiting from immersive, non-fatiguing acoustics for precise positional audio.
Macro shot of HD 660S2 headphone's open-back metal mesh earcup with visible driver and Sennheiser logo for premium audio design.
Man relaxing by the window wearing HD 660S2 headphones, enjoying high-fidelity wired audio with deep bass and clarity.
Close-up of Sennheiser HD 660S2 headphone earcup with bronze logo and precision-engineered mesh for open-back acoustic performance.

Sennheiser

Sennheiser - HD 660S2 Open-Back Wired Headphone

Sale price₹ 27,990Regular price MRP:₹ 54,990

    38mm High-Precision Drivers with 300Ω Impedance

    Warm, Detailed & Balanced Audiophile Sound

    Open-Back Design for Wide, Natural Soundstage

    Lightweight Build with Plush Velour Comfort

    Dual Detachable Cables for Versatile Connectivity

    German-Engineered Premium Build Quality
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RETURN POLICY

10 Days Replacement Policy for Manufacturing defects. Info All products are covered by 10 Day Replacement Guarantee. This product is eligible for a free replacement, in case you receive a damaged, defective or different item. Please keep the product in its original condition with all accessories & packaging for a successful return. We may contact you to assess the damage or defect before issuing a replacement. Accessories like cables and eartips are not backed up the manufacturer's warranty.

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WARRANTY

2 Year Manufacturer's Warranty

Description

Sennheiser brings its engineering legacy to this refined open-back headphone, featuring advanced 38mm drivers with 300Ω impedance, ultra-light aluminium voice coils, and a vented magnet system for deeper bass, cleaner transients, and low distortion. Its warm, balanced sound signature delivers rich mids, smooth treble, and an airy, spacious soundstage ideal for audiophiles, music lovers, and studio work.

Designed for long comfort, it features plush velour pads, a lightweight 260g build, and breathable materials. The dual detachable cables—6.3mm and 4.4mm—plus a 3.5mm adapter offer full connectivity for DACs, amps, and interfaces. Engineered in Germany and made in Ireland, it ensures premium durability and reliable performance.

 

ADVANCED 38MM DRIVERS WITH 300Ω IMPEDANCE

Powered by ultra-light aluminium voice coils and a precision-tuned vented magnet system, these Sennheiser headphones deliver deep low-frequency extension down to 8Hz for more impactful sub-bass. This technical refinement delivers cleaner transients, reduced distortion, and superior detail—ideal for anyone seeking audiophile-grade wired headphones or premium headphones for professional use.

WARM, BALANCED & DETAILED SOUND SIGNATURE

The HD 660S2 combines powerful sub-bass, rich midrange, and smooth treble for a warm, fatigue-free sound, focusing purely on sonic accuracy and immersive musicality. Its open-back design creates a spacious, natural soundstage—perfect for audiophiles and music lovers who demand true-to-life detail and long listening comfort.

ENGINEERED FOR ALL-DAY COMFORT

With plush velour earpads, an ergonomic padded headband, and a lightweight 260 g design, these over-ear headphones remain exceptionally comfortable during long studio sessions or relaxed daily listening. Designed for prolonged sessions, the HD 660S2 offers a physically relaxing fit paired with a pleasant, non-fatiguing sound signature—you’ll quickly develop an attachment to this immersive and soothing listening experience.

IMMERSIVE OPEN-BACK AUDIOPHILE SOUND

Designed for true music lovers and audiophiles, these premium over-the-ear headphones deliver an exceptionally wide, airy soundstage. Whether you're using them as a studio headphone, headphone for music listening, or a high-end wired headset, the HD 660S2 produces natural acoustics that feel lifelike and deeply engaging.

VERSATILE DUAL DETACHABLE CABLE SYSTEM

The dual detachable 1.8m cables (6.3mm unbalanced and 4.4mm balanced) plus a 6.3–3.5mm adapter make it easy to connect to DACs, interfaces, amps, and portable players while preserving signal purity and durability. Whether you're upgrading your wired headphone setup or switching from a wired headset, the HD 660S2 ensures premium signal purity and durability.

EUROPEAN-ENGINEERED PREMIUM BUILD QUALITY

Designed in Germany and manufactured in Ireland, the HD 660S2 combines precise engineering with robust construction for long-term reliability—trusted by music lovers, producers, and audio engineers. Their robust construction makes them a trusted choice for hobbyists, music producers, engineers, and anyone seeking a premium audiophile headphone experience.

Specifications

Brand Name
Sennheiser
Model Name
HD 660S2
Transducer Principle
Dynamic, Open-Back
Transducer Size
38 mm
Frequency Response
8 – 41,500 Hz
Impedance
300 Ω
Sound Pressure Level (SPL)
104 dB (1 kHz, 1 Vrms)
Total Harmonic Distortion (THD)
<0.04% (1 kHz, 100 dB)
Ear Coupling
Over-Ear
Weight
260g
Connector
6.3mm Jack Plug, 4.4mm Balanced Plug
Adapter
6.3mm to 3.5mm
Cable Length
1.8m
Magnetic Field
4.5mT
Country of Origin
Ireland

Box Content

    What Will You Get
  • 1× Sennheiser - HD 660S2 Headphone
  • 1× 6.3mm Unbalanced Cable (1.8m)
  • 1× 4.4mm Balanced Cable (1.8m)
  • 1× 6.3mm to 3.5mm Adapter
  • 1× Carry Pouch

Warranty

2 YEAR WARRANTY

Don't worry, Sennheiser - HD 660S2 Open Back Wired Headphone comes with a 2 Year warranty against manufacturing defects. We guarantee that every product on Concept Kart is genuine and backed by the Manufacturer's warranty.

Read more about Concept Kart's warranty policy.

Shipping Policy

FREE SHIPPING ON ALL ORDERS

At Concept Kart, we offer FREE standard shipping on all orders across India. Orders placed before 2 PM are usually dispatched on the same working day, while orders placed after 2 PM are dispatched on the next working day (excluding Sundays and public holidays) from our Delhi warehouse.

Delivery usually takes 1–2 business days in Delhi, the next working day in metro cities, and 2–7 business days in other locations after dispatch. We use trusted courier partners, including BlueDart and Delhivery, and share tracking details via email or WhatsApp. For prepaid orders, OTP verification is required at delivery for added security. Share the OTP only after receiving your package.

COD is available for orders between ₹1,500 and ₹10,000, with cash handling charges of ₹50 (up to 1 kg) and ₹100 (above 1 kg), displayed at checkout.

Delivery may be delayed due to festivals, extreme weather, floods, protests, or courier disruptions. Pre-orders follow the estimated timelines mentioned on their product pages.

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