Sennheiser - HD 660S2

Open-Back Headphones

Sale price₹ 34,990 Regular priceMRP: ₹ 54,990

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7 Day Replacement Guarantee

In case you receive the Sennheiser - HD 660S2 with a manufacturing defect, please raise a return request within 7 days of delivery.

However, if you receive an incorrect / damaged / different product or one with missing accessories, please raise a return request within 24 hours of delivery. In case you receive a product with a missing, incorrect, or faulty accessory, you will be given a replacement accessory instead of the entire product.

Please make sure that the product is in the original packaging with all the accessories it came with. We'll also need an unboxing video and images of the parcel to investigate about the discrepancy. You may be asked to share images of the product and the packaging received for us to determine the damage or defect prior to approving the return request. The free replacement will be shipped only once the original order is returned.

A replacement will be issued only if:

- It is found to be defective
- It is determined that the product was not damaged while in your possession
- The product is not different from what was shipped to you
- The product is returned in original condition (with brand’s/manufacturer's box, MRP tag intact, user manual, warranty card and all the accessories therein)


Warranty & Services

Don't sweat it, this Sennheiser - HD 660S2 comes with a 2 Year warranty from Sennheiser that covers manufacturing defects. All products featured on Headphone Zone are backed by an original manufacturer's warranty.

Read more about Sennheiser's warranty in India.

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Why Sennheiser is Special


Designed in Germany

Established & Reputed

Trust us, our reputation in the audio world speaks for itself!

This headphone or gear comes from a well-respected brand known for its high-quality audio equipment, so you can be confident in your purchase.

If you see a product marked as “🎖️ Established & Reputed”, it means you're getting a top-tier device from a brand that's earned its stripes in the audio industry.

Revered by Audiophiles

Audiophiles can be really picky and tough to impress and if the audiophile community says something sounds good, you can bet it's great!

This headphone or gear has gained recognition and admiration from audiophiles, who are known for their discerning taste in high-fidelity audio. They appreciate its precision, attention to detail and its ability to deliver an immersive sonic experience.

If you see a product marked as "🙌🏻 Revered by Audiophiles", it means that it meets the highest standards of sound quality and performance, making it a top choice for anyone who values exceptional audio experiences.


A masterpiece from the experts who know audio inside and out!

This headphone or gear is crafted by specialists who know their stuff, ensuring every detail is perfect.

If you see a product marked as “🌟 Specialist”, it means you're choosing a device designed by experts who specialize in creating this specific category of device.


Born in 1945

Why we love this Headphone

Premium Economy

Sensible spending and class above in quality. 

This headphone or gear offers top-notch sound and performance without much impact on your pocket, promising a delightful experience that exceeds your expectations at an economical price point.

If you see a product marked as “💎 Premium Economy," it indicates that you're getting a high-quality audio product with exceptional sound clarity and reliable performance, all at a budget-friendly price.

Serious Audiophiles Only

Diving deeper into exploring the hobby is never enough.

If you're an audiophile on a hunt for a device that meets your high standards, this is one such headphone or gear designed for discerning audiophiles like you in mind.

If you see a product marked with “🦈 Serious Audiophiles Only" we assure you that this device can match your depth of knowledge and expertise to take your passion for audio to the next level.

Great for Studio & Professionals

When you need the best to deliver your best.

This headphone or gear meets the high standards and requirements of a professional and studio environments. Plug these in and focus on doing your best work.

If you see products marked as “🎙️ Great for Studio & Professionals”, you can trust that you're getting precision, reliability, and top-tier performance, perfect for bringing your creative and professional projects to life!

Balanced Output

Upgrading from single-ended to balanced can be the easiest way to improve your sound.

This DAC, Amp or Hi-Res player offers a balanced output, ensuring pristine audio quality with minimised interference and enhanced clarity for your listening pleasure.

If you see a product marked as "⚖️ Balanced Output”, get ready for a symphony of crystal-clear tunes, free from any unwanted noise drama!

Upgradeable Cable

Not happy with your current cable? Swap it out!

If you're searching for an in-ear monitor with a detachable design, these IEMs fit the bill.

If you see an IEM marked with "🔌 Upgradeable Cable," it means it comes with a detachable cable. You can easily swap or upgrade the cable, allowing for customization or maintenance whenever you desire.

Why it Sounds Amazing


38mm Dynamic Drivers

Flat Sound Signature

For those on a quest to try and hear the “purest” audio possible.

This headphone or gear offers an neutral, uncoloured audio profile, perfect for purists who crave accuracy.

If you see products marked as “📏 Flat Sound Signature”, you’re in for a true-to-life listening experience, hearing your music exactly as it was recorded, without any artificial boosts or tweaks.

Crisp Vocals & Instruments

Vocals and Instruments sound too good, its like a warm hug.

This headphone or gear excels at delivering clear, clean vocals and instruments, making every sound pop.

If you see products marked as “🍿 Crisp Vocals & Instruments”, prepare for an audio experience where every word and note is perfectly articulated, letting you enjoy your music with pristine clarity and detail.

Sharp & Precise Details

Are you a lover of sharp and precise details in your music?

This headphone or gear delivers meticulous and accurate details in your audio, ideal for those who prioritise precise sound reproduction.

If you see a product marked with "📌 Sharp & Precise Details", it means this device excels in capturing fine nuances and intricacies in your music, ensuring a high level of clarity and fidelity.

Perfect to Analyse Music

Delve deeper into the Bassline, Riffs and Harmonies.

This headphone or gear is designed for those who dive deep into the nuances of sound, offering precision for music analysis.

If you see products marked as “🔍 Perfect to Analyse Music”, get ready to dissect every beat, note, and harmony with exceptional clarity, making it an ideal tool for musicians, producers, and audiophiles who crave detailed insights into their music.

Needs Amplification

I need more power to thrive.

This headphone or gear shines brightest with a bit of extra power. It’s designed to deliver top-notch performance when paired with an amplifier, giving you that full, rich sound you crave.

If you see a product marked as "🚂 Needs Amplification", it means this device is built to excel with an amp, ensuring you get the most out of your music with enhanced volume and clarity. Perfect for audiophiles who love their sound big and bold.

The Sennheiser HD 660S2 provides an effortless listening experience. If you have a preference for acoustic or vocal-focused music, these over-ear headphones are likely to satisfy your tastes. The quality of the midrange alone might be enough to make the purchase worthwhile, but what distinguishes them is the notable bass presence, making them a compelling option for an upgrade.


Raghav Somani is the Founder & CEO of Headphone Zone. An avid audiophile and musician since 2008, his choice of headphones include STAX Electrostats, Audeze LCD 3, and for music on the go, the JH Audio Roxanne + Astell&Kern SP1000 is never too far away. On his playlist, you'll find A.R. Rahman, Michael Jackson, and the Eagles.


Sennheiser has a 75-year history, past achievements, and inventions in the audio industry as a third-generation family-run company, as well as its desire to influence its future. Sennheiser's engineers work diligently to provide some of the most audiophile-focused headphones available. The manufacturing process for headphones like the HD 600, HD 650, HD660S, HD 800 S, and HD 820, to mention a few, involved extensive research and development. With the same approach, the HD 660S2 was born. The new, high-end Sennheiser HD 660S2 headphone outperforms the iconic HD 660S's excellent performance. Sennheiser is attempting to expand its product line with the HD 660S2, designed specifically for the most demanding listeners. An eye-catching new matte black design is featured on the Sennheiser HD 660S2. It has a classically exquisite appearance with some modern influences. It truly represents sophistication with the text and logo having bronze colour. The HD 660S2 headphones provide an audiophile-grade experience that will take your breath away!



Sennheiser has reduced the transducer size on the HD 660S2 having the all-new 38mm transducer. The HD 660S2 has an extended sub-bass response compared to the HD 660S. It offers a relaxed sound signature with non-offensive tuning, allowing you to listen to your favourite tracks at a stretch. It has exceptional resolution taking you closer than ever to instruments and vocalists. The sound is relatively balanced across the frequency spectrum that does not lead to fatigue if listened to for long hours. The HD 660S2 has a warm and inviting signature combined with extended sub-bass making listening uniquely pleasant and rewarding. It practically begs you to keep going for endless sessions. That’s how HD 660S2 combines the best of both worlds combining non-offensive tuning and optimum comfort. The HD 660S2 gives you an extraordinary experience, allowing you to immerse yourself in music. Dive deeper into the legendary sound of the HD 660S2!



High-end Sennheiser headphones have inspired generations since the HD 580 because of their balanced, natural reproduction. The HD 600, HD 650, and HD 660S all share audible and visual characteristics with the HD 660S2 and are industry standards for neutral audiophile sound. For instance, the HD 660S2 has an updated coil which now matches the renowned HD 600 and HD 650 300-ohm impedance. Moreover, this redesigned coil offers improved electrical damping and magnetic force for an impactful impulse response. The HD 660S2 has significantly better accuracy, responsiveness, and resolution and twice as much sound pressure at the lowest frequencies. Sennheiser has retained extraordinary precision and balance throughout the sub-bass, mid-bass, and beyond. Most impressive is how this affects the listening experience. Extension on the low end changes everything — by creating more space for the sound. Against a deeper backdrop, highs feel more brilliant, the soundstage deeper and open, and emotions stronger with precise imaging. Experience an oasis of sonic bliss with the all-new HD 660S2!



The Sennheiser HD 660S2 is built entirely in Ireland and quickly grabs your attention due to its excellent build quality. The HD 660S2's velour earpads can only be described as a physical delight. The headband won't detract from your music thanks to its soft padding and just-right tension for optimal acoustic alignment. The HD 660S2's open-back design provides an incredibly comfortable environment, even during prolonged sessions. The ergonomic headband and lightweight design rule out any potential discomfort on top of your head. You'll rapidly develop an attachment to a listening experience as physically relaxing as the pleasant, non-fatiguing sound at its core.



Sennheiser is known for designing some of the most versatile cables that are robust and provide exceptional audio transmission. Sennheiser has included two sets of beautiful cables with the HD 660S2 to accommodate your audio configuration. It has no microphonics and achieves a stable connection. The package includes a 6.3mm (Single-Ended) cable and a 4.4mm (Balanced) cable with 1.8m in length, making them compatible with most audio sources. One benefit of using the HD 660S2 with a balanced connection is that it offers an even lower noise floor and excellent dynamic range. The result is a broader soundstage, precisely controlled transients, and impossibly distinct instrument separation.

2 Year Warranty

Don't sweat it, this Sennheiser - HD 660S2 comes with a 2 Year warranty from Sennheiser that covers manufacturing defects. All products featured on Headphone Zone are backed by an original manufacturer's warranty.

Read more about Sennheiser's warranty in India.

75 Years of German Excellence and Innovation in High-Fidelity Audio

Established in 1945, Sennheiser, a German audio company based in Wedemark, boasts a 75-year history crafting high-fidelity products like microphones and headphones. Helmed by third-generation co-CEOs Daniel and Andreas Sennheiser, the globally acclaimed company is committed to audio innovation, offering diverse audio solutions from trusted classics to cutting-edge wireless models, shaping the future of audio experiences.

With a customer-centric approach, Sennheiser focuses on fostering trust in audio equipment for an exceptional music experience, featuring iconic models like the Sennheiser HD800, HD800S, HE1, and IE series of IEMs. Today Sennheiser’s headphones and IEMs are used by the top Music Producers, Mixing and Mastering Engineers in studios across the world.

Explore Collection
Sound Guys

"Specifically: it’s built for sound quality only, so there’s little in the way of advanced features or frills, instead focusing on comfort and performance above any other concern."

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Digital Trends

"In a word, the sound is effortless. It just springs forth and gently bathes you in its detail, instead of pummeling you, which is a possible side effect of closed-back headphones. "

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"The S2 has smooth and delicious treble for high hats and higher pitched instruments. It's done completely different compared to the 600, 660S and 560S. And it's realism."

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Major HiFi

"The S2 does make its case with the improvements in the sound signature. The soundstage depth is an improvement, but the bass and treble also undergo enhancement."

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"Plush earpads and cushy headband padding place the revised 300-ohm transducers at optimal distance from the ear resulting in a spacious soundstage with abundance of detail."

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Audio Science Review

"The coil matches the 300-ohm impedance of the HD 600 & HD 650. This new coil provides higher magnetic force and electrical dampening for cleaner impulse response."

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"It’s clear that Sennheiser not only had sound professionals in mind when creating the 660S2; it is meant to be enjoyed for tender handling of instruments and its buoyant character."

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"The Sennheiser HD 660S2 are very good for neutral sound. They have a warm sound profile and, despite being open-back, pack more thump and rumble than their predecessor."

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"The waiting is finally over, as clearly HD660S2 aren’t only bassier, deeper, and punchier sounding than any other cans from the HD6XX lineup."

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Hi-Fi Trends

"By and large, I found the Sennheiser HD 660S2 Open-Back Headphones to have an immediate sound with lots of clarity, detail, and speed."

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Sennheiser - HD 660S2 Open-Back Headphones Sale price₹ 34,990 Regular price₹ 54,990
Sennheiser - HD 650 Open-Back Headphone Sale price₹ 29,990 Regular price₹ 49,990
Headphone-Zone-Sennheiser-HD 600
Sennheiser - HD 600 Open-Back Headphones Sale price₹ 24,990 Regular price₹ 44,990
Sennheiser - HD 660S2 Open-Back Headphones Sale price₹ 34,990 Regular price₹ 54,990
Sennheiser - HD 650 Open-Back Headphone Sale price₹ 29,990 Regular price₹ 49,990
Headphone-Zone-Sennheiser-HD 600
Sennheiser - HD 600 Open-Back Headphones Sale price₹ 24,990 Regular price₹ 44,990
Sound Signature

Flat: Designed for studio professionals for critical reference monitoring.

Flat: Designed for studio professionals for critical reference monitoring.

Flat: Designed for studio professionals for critical reference monitoring.

Driver Configuration

38mm Dynamic Drivers

42mm Dynamic Drivers

42mm Dynamic Drivers






300 Ohms

300 Ohms

300 Ohms

Our Verdict

This headphone is a classic. The Sennheiser HD650 isn't a new headphone, but it's still a favourite amongst audiophiles. The sound signature can be best described as 'reference grade' because so many people over the years have used this as a benchmark for use in the studio and at home. Pair it with a decent tube amplifier to hear it sing.

Customer Reviews

Based on 3 reviews
Ranjeeth K (Mumbai)
660S2 is Excellent in its performance

It’s is Superb headphone. Bass is good however it’s not too much by not making fatigue. Sound staging is very clear to notice. In fact, I was able to hear all the instruments clearly. Even if I don’t concentrate on background instruments, the 660 s2 headphone will notice me about tiny instruments sounds. Overall good headphone for the one who is looking for decent bass, better sound imaging and vocal forward feature.

Great review! Thanks for taking the time to write it. We're glad to hear that our product has helped you improve your sound quality.

A.T. (New Delhi)
This is what the original 600 should have been

It’s an absolutely brilliant upgrade over 650/600/660S

Easier to drive while being just as brilliant while being less dependent on EQ to make it shine

Everything seems to have been improved across the board

Honestly, this is one of the biggest values in audio today

This is even bigger value than 600 at 20k because the 660S2 is more palpable for the masses at large and also improves on technicalities for hardcore audiophiles

Hey there,

Thank you for taking the time to write this review, we really appreciate the genuine feedback! Your review will definitely help fellow audiophiles to make an informed decision.

Murali Das (Chennai)
Excellent in every way

Great comfort, light weight, superb quality and very beautiful. Music simply flows naturally. Took a while to burn in and after that its simply outstanding. Not very hard to drive but still scales up nicely with my Topping A70 Pro. Loving it.

And yes , special thanks to Raghav for the 1 Day delivery. Headphonezone rocks!

Hey there, thank you for the great review and ratings! So delighted that you are loving your purchase. Hope you had a comfortable shopping experience. Cheers!

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