Sennheiser HD 660S2

• Monitor-grade headphones designed for audiophiles
• Double the bass performance of its predecessor, with richer sound
• Delivers extreme clarity, detailed sound, and a natural, open soundstage
• Lightweight design and velvet earcups for long-lasting comfort

NT$19,900

NT$14,900

products.quantity_limit99999

This quantity is invalid, please enter a valid quantity.

SOLD OUT

Please message the shop owner for order details.

Add to Wishlist

Sennheiser HD 660S2 Open-back Headphones｜Born for Audiophiles, Reimagining a Monitoring-Grade Classic with Deep Bass Evolution

Monitoring-Grade Open-back Headphones, Experience the Shocking Detail of Double the Sub-bass

The Sennheiser HD 660S2 is a monitoring-grade open-back headphone designed for high-fidelity audio enthusiasts. It features a newly optimized 38mm high-performance dynamic driver and an ultra-light aluminum voice coil, boasting a high impedance of 300 ohms. Its core upgrade lies in significantly enhanced bass response, offering an ultra-wide frequency range from 8Hz to 41,500Hz, making every note's detail clearly audible, especially in the previously hard-to-reach extreme low-frequency range.

Compared to its highly acclaimed predecessor, the HD 660S, the HD 660S2 achieves double the sound pressure level (SPL) in the sub-bass range through an optimized airflow system and a new voice coil design. This delivers a more impactful and extended bass response while perfectly preserving the renowned precision and balance of the Sennheiser 600 series. This makes it not only an excellent tool for music appreciation but also an ideal choice for professional monitoring headphones, allowing you to experience unprecedented sound depth and emotional tension.

Quick Facts Product Overview

Brand: Sennheiser
Model: HD 660S2
Headphone Type: Open-back, Dynamic
Impedance: 300 Ohms
Frequency Response: 8 Hz – 41,500 Hz
Driver Size: 38mm
Applicable Scenarios: Professional Mixing & Monitoring, Hi-Fi Music Appreciation, Vinyl Listening, Gaming Audio, Audiophile Collection

Who is the Sennheiser HD 660S2 for?

使用者建議分析(點此展開)

▼

適合誰購買

Audiophiles seeking ultimate sound quality and a wide soundstage, who wish to build a Hi-Fi listening system at home.
Mixing engineers or music producers who need to accurately judge low-frequency details and instrument separation.
Loyal Sennheiser users upgrading from the HD 600/650 series, seeking more powerful bass and a modern sound signature.

誰不適合購買

Users who frequently use headphones outdoors or in noisy environments and require physical sound isolation (open-back headphones leak sound).
Entry-level users who primarily use direct drive from mobile phones or laptops without a dedicated headphone amplifier (300 ohms requires sufficient power).
Listeners who prefer the strong bass immersion of closed-back headphones over a natural, transparent soundstage.

Sennheiser HD 660S2 Core Technologies and Features

Double Sub-bass Performance: By lowering the driver's resonant frequency and optimizing airflow, the HD 660S2 achieves double the sound pressure level (SPL) of its predecessor in the 20Hz to 200Hz range, delivering deeper, clearer, and more impactful bass without affecting mid-high frequency precision.
Optimized Airflow System: The unique open-back design, combined with an outer steel mesh grille and internal ventilated magnet system, effectively guides airflow, minimizing distortion and turbulence to create an extremely natural, open, and immersive soundstage.
38mm High-Performance Driver: The German-designed patented 38mm driver undergoes strict tolerance control to ensure high consistency between left and right channels, delivering the ultimate clarity and detail resolution sought by modern audiophiles.
Ultra-Light Aluminum Voice Coil: Featuring a newly designed ultra-light aluminum voice coil with an impedance of 300 ohms, it provides extremely fast transient response and impulse fidelity, accurately reproducing the most subtle dynamic changes in music.
Long-Wearing Comfort: Weighing only 260 grams, its lightweight structure, combined with an ergonomic headband and replaceable luxurious velour ear pads, provides excellent breathability and comfort, preventing fatigue even during extended listening sessions.
Versatile Connectivity Options: Includes two 1.8-meter detachable headphone cables, one with a 6.3mm single-ended connector and one with a 4.4mm Pentaconn balanced connector, along with a 6.3mm to 3.5mm adapter, to meet the needs of various playback devices.

Standard Accessories (What's in the Box)

1 x HD 660S2 Open-back Headphones
1 x 1.8 meter (5.9 ft) 6.3mm (1/4 inch) Headphone Cable
1 x 1.8 meter (5.9 ft) 4.4mm Pentaconn Balanced Headphone Cable
1 x 6.3mm (1/4 inch) to 3.5mm (1/8 inch) Adapter
1 x Original Carry Pouch

Technical Specifications (Tech Specs)

Headphone Type	Open-back
Wearing Style	Circumaural
Driver Size	38mm Dynamic Driver
Frequency Response	8 Hz - 41,500 Hz (-10 dB)
Impedance	300 Ω
Sound Pressure Level (SPL)	104 dB (1 V)
Total Harmonic Distortion (THD)	< 0.04% (1 kHz, 100 dB)
Connectors	6.3mm (1/4 inch) Unbalanced, 4.4mm Pentaconn Balanced
Cable Length	1.8 meters (5.9 ft)
Detachable Cable	Yes
Color	Black
Ear Pad Material	Velour
Weight	260 grams (0.57 lbs) (without cable)

Sennheiser HD 660S2 Pros and Cons

Pros & Notes (Click to expand)

▼

Pros

Significantly improved sub-bass response, delivering rich and powerful bass while maintaining the transparent feel of open-back headphones.
Excellent detail resolution and a wide, natural soundstage, suitable for professional mixing and audiophile-grade music appreciation.
Lightweight design and soft velour ear pads ensure comfort for long listening sessions.

Notes to Know

300-ohm high impedance design; a dedicated headphone amplifier is recommended to unlock its full potential.
The open-back structure provides no sound isolation and leaks sound, making it unsuitable for use in quiet public places or noisy environments.
Comes with 6.3mm and 4.4mm balanced connectors; an included adapter is required for connecting to 3.5mm devices.

Sennheiser HD 660S2 FAQ

Q：What is the biggest difference between the Sennheiser HD 660S2 Open-back Headphones and the previous generation HD 660S?

▼

A：The main difference lies in the bass performance. The HD 660S2 has double the sound pressure level in the sub-bass range compared to its predecessor, offering a fuller, deeper sound while maintaining clarity and detail in the mid-high frequencies.

Q：How should I choose between the HD 660S2 and the HD 600 / HD 650?

▼

A：If you are looking for a more modern, powerful bass and extended high frequencies, choose the HD 660S2. If you prefer the classic, rich vocal midrange, the HD 600/650 remains an excellent choice.

Q：I don't have a headphone amplifier. Is it suitable to drive the HD 660S2 directly from a computer?

▼

A：Not entirely recommended. While it will produce sound, the 300-ohm high impedance will limit dynamic and bass performance without sufficient power. A headphone amplifier is recommended for the best experience.

Q：Is the HD 660S2 suitable for gaming or watching movies?

▼

A：Absolutely. Its wide soundstage and precise sound positioning provide an immersive gaming and movie audio experience, especially clearly rendering subtle environmental sounds and the impactful bass of explosions.

THINK2 Warranty & Support

Service Highlights

Fast Shipping: In-stock items will be shipped within 24 business hours.
Professional Technical Support: Our certified audio engineers provide consultation for installation, licensing, compatibility, and setup.
Comprehensive Warranty & After-Sales Service: Includes both manufacturer warranty and THINK2 customer support.

※ Shipping times are calculated based on business days. Actual warranty follows the manufacturer’s policy. THINK2 provides integration and support assistance.

Warranty & Return Policy

With valid proof of purchase and product serial number, customers are entitled to manufacturer warranty and THINK2 after-sales service.
DOA / Non-human defects: Within 7 days of purchase, after verification, customers may request return or replacement.
Exclusions: Damages from misuse, unauthorized modification, consumable parts, natural disasters, or improper use beyond instructions.
Application Process: Contact customer service during business hours for return instructions.
Service Coverage: Taiwan region primarily; overseas based on logistics standards.

THINK2 — Authorized Audio Gear Dealer in Taiwan