---
product_id: 529596679
title: "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"
brand: "sennheiser"
price: "4853 kr"
currency: DKK
in_stock: true
reviews_count: 8
category: "Sennheiser"
url: https://www.desertcart.dk/products/529596679-hd-660s2-open-back-hi-res-audiophile-headphones-ultra-light
store_origin: DK
region: Denmark
---

# 300Ω impedance for pristine clarity Extended sub-bass impact, deep & distortion-free Ultra-light 38mm aluminum voice coil 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

**Brand:** sennheiser
**Price:** 4853 kr
**Availability:** ✅ In Stock

## Summary

> 🎶 Elevate your audio game — hear every detail, feel every beat.

## Quick Answers

- **What is this?** 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 by sennheiser
- **How much does it cost?** 4853 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/529596679-hd-660s2-open-back-hi-res-audiophile-headphones-ultra-light)

## Best For

- sennheiser enthusiasts

## Why This Product

- Trusted sennheiser brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **All-Day Comfort:** Lightweight 260g frame with plush velour ear cushions for fatigue-free extended listening sessions.
- • **Immersive Soundstage:** Open-back design with airflow-optimized transducers delivers a spacious, speaker-like listening experience.
- • **Versatile Connectivity:** Includes balanced 4.4mm and unbalanced 6.3mm cables plus 3.5mm adapter for seamless device compatibility.
- • **Audiophile-Grade Precision:** German-designed, Irish-assembled craftsmanship ensures unmatched build quality and sonic accuracy.
- • **Deep, Distortion-Free Bass:** Redesigned voice coil doubles low-frequency output for powerful sub-bass without muddiness.

## Overview

The Sennheiser HD 660S2 are premium open-back audiophile headphones featuring a 300 Ohm impedance and ultra-light 38mm aluminum voice coils. Expertly crafted with German components and Irish assembly, they deliver an expansive soundstage with extended sub-bass impact and crystal-clear highs. Designed for comfort and endurance, these headphones come with plush velour ear pads and versatile cables, backed by a 2-year warranty—perfect for professionals and discerning listeners craving studio-quality sound.

## Description

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 : desertcart.in: Electronics

Review: Best entry audiophile headphones - Been using for 6 months now, even with rough use its been holding up better than my gaming headphones (Logitech G pro X). It was able to run off my motherboard audio(supremefx audio chip with 9 resistors) But even with full volume it only gave out what my Dac & Amp gives in 15-20 volume Pros: long lasting comfort for my big head with ample earcup size, no matter how high the volume is, the headphones don’t crackle or cut out the sounds, you may need a appropriate Dac and amp to support these headphones (the one I use it Fiio K11 R2R). Can be run off iphone with iphone’s headphone dongle too. Cons: the size adjustment Sometimes feels very hard to adjust which in turn feels like breaking, but the build quality is insane for what its worth, and even with getting the headphone get hit or banged on table, i dont see any visible scratches after 6 months. The velour earpads need some maintenance tho If u r a bass lover, open back headphones are not for you But if you try these out, u wouldn’t want to go back to closed back or bassy headphones much
Review: Amazing - Wow ,paired with Fosi DS2 balanced output and voila! What a soundstage. Everything is perfect,I didn’t know fosi has so much details and neutral soundstage. Apple Lossless sounds like never before on iPhone 14

## Features

- 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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BT7XXYTB |
| Age Range Description | Adult |
| Audio Driver Type | Dynamic Driver |
| Best Sellers Rank | #75,851 in Electronics ( See Top 100 in Electronics ) #225 in Over-Ear Headphones |
| Box Contents | 6.3 mm cable (1.8 m), 4.4 mm cable (1.8 m), 6.3mm to 3.5mm adapter, HD 660S2 headphones, Protective Case |
| Brand | Sennheiser |
| Brand Name | Sennheiser |
| Cable Features | Detachable |
| Colour | Black, |
| Compatible Devices | Cellphones, Gaming Consoles, Laptops, Music Production Equipment, Portable Media Player, Tablets |
| Control Method | Touch |
| Control Type | Media Control |
| Country of Origin | Ireland |
| Customer Reviews | 4.5 out of 5 stars 554 Reviews |
| Ear Placement | Over Ear |
| Earpiece Shape | Over Ear |
| Enclosure Material | Aluminium |
| Form Factor | Over Ear |
| Frequency Range | 27.5 Hz - 41,500 Hz |
| Frequency Response | 41500 Hz |
| Global Trade Identification Number | 00810091270370, 04260752330374 |
| Headphone Form Factor | Over Ear |
| Headphone Jack | 3.5 mm Jack |
| Headphones Ear Placement | Over Ear |
| Impedance | 300 Ohms |
| Impedance Unit of Measure | 300 Ohms |
| Importer Contact Information | Sennheiser Electronics India Private Limited, 104 A,B,C Time Tower, Mehrauli-Gurgaon Rd, Sector 28, Gurugram, Haryana 122002 |
| Is Autographed | No |
| Item Height | 10 Centimeters |
| Item Type Name | Audiophile Headphone |
| Item Weight Unit of Measure | 260 Grams |
| Manufacturer | Sennheiser, Sennheiser electronic gramsbH & Co. kilograms. Am Labor 1. DE - 30900 Wedemark Germany |
| Manufacturer Contact Information | Sennheiser electronic gramsbH & Co. kilograms. Am Labor 1. DE - 30900 Wedemark Germany |
| Model Name | HD 660S2 |
| Model Number | 700240 |
| Network Connectivity Technology | Wired |
| Noise Control | None |
| Number of Items | 1 |
| Packer Contact Information | Sennheiser electronic gramsbH & Co. KG. Am Labor 1. DE - 30900 Wedemark Germany |
| Product Features | Audiophile Stereo Headphones |
| Series Number | 660 |
| Theme | music |
| UPC | 810091270370 |
| Unit Count | 1 Count |
| Warranty Description | 2 Year Warranty |

## Product Details

- **Brand:** Sennheiser
- **Colour:** Black,
- **Ear Placement:** Over Ear
- **Form Factor:** Over Ear
- **Impedance:** 300 Ohms

## Images

![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 - Image 1](https://m.media-amazon.com/images/I/81EVN1kWYjL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Best entry audiophile headphones
*by A***D on 8 October 2025*

Been using for 6 months now, even with rough use its been holding up better than my gaming headphones (Logitech G pro X). It was able to run off my motherboard audio(supremefx audio chip with 9 resistors) But even with full volume it only gave out what my Dac & Amp gives in 15-20 volume Pros: long lasting comfort for my big head with ample earcup size, no matter how high the volume is, the headphones don’t crackle or cut out the sounds, you may need a appropriate Dac and amp to support these headphones (the one I use it Fiio K11 R2R). Can be run off iphone with iphone’s headphone dongle too. Cons: the size adjustment Sometimes feels very hard to adjust which in turn feels like breaking, but the build quality is insane for what its worth, and even with getting the headphone get hit or banged on table, i dont see any visible scratches after 6 months. The velour earpads need some maintenance tho If u r a bass lover, open back headphones are not for you But if you try these out, u wouldn’t want to go back to closed back or bassy headphones much

### ⭐⭐⭐⭐⭐ Amazing
*by B***H on 2 October 2025*

Wow ,paired with Fosi DS2 balanced output and voila! What a soundstage. Everything is perfect,I didn’t know fosi has so much details and neutral soundstage. Apple Lossless sounds like never before on iPhone 14

### ⭐⭐⭐⭐⭐ Amazing detail & wide soundstage from a closed back
*by A***U on 24 June 2025*

Amazing detail in sound. The HD820 headphones are very comfortable with moderately good sound isolation. The headphones originally had an issue with the right side driver emitting soft rattle with heavy bass frequencies. Contacted Sennheiser (Sonova India) and got a replacement under warranty. The experience with Sennheiser Service (Sonova India) was seamless. Everyone along the chain were prompt in responding & updated me on the status. The Rep assisted me by guiding me on how to send them to the service centre in Delhi. Everything went seamless. With this service experience with Sennheiser India, i now have more confidence in buying more Sennheiser products. I constantly keep track for deals on Sennheiser Headphones. Started my Audiophile Journey with Sennheiser MXW1 (World's 1st Wireless Earbuds) in 2008 and bought several Sennheiser Headphones all over the world since. No matter what country i was in i was able to find Sennheiser products easily compared to any other brand. The journey continues.

## Frequently Bought Together

- Sennheiser HD 660S2 Wired Audiophile Stereo Headphones with Deep Sub Bass, Optimized Surround, Transducer Airflow, Vented Magnet System and Voice Coil – Black
- FIIO K11 Desktop 1400W Power Balanced Headphone DAC & Amplifier 384kHz/24Bit DSD256 for Home Audio/PC 6.35mm/4.4mm/RCA/Coaxial/Optical (Black)
- NewFantasia 4.4mm Balanced Male 6N OCC Copper Silver Plated Cord 4.4mm Balanced Cable Compatible with Sennheiser HD650, HD600, HD580, HD660S, HD58X, Massdrop HD6XX Headphone Walnut Wood Shell

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*Product available on Desertcart Denmark*
*Store origin: DK*
*Last updated: 2026-01-31*