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Sennheiser HD 660S2 Open-back Headphones | 38mm Drivers, 300Ω Ω, Audiophile-grade Upgrade
Inventory: In stock (estimated to ship within one business day)
Delivery and shipping fees (Free shipping on orders over HK$500)
International Shipping
Free-shipping thresholds · Power Bank surcharge
Hong KongFREE
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Macau
Free shipping on orders HK$800+ (2-3 business days)
Australia (6-12 business days depending on area or zone)
Free over AU$100 · Flat AU$9.99 below
United Kingdom 0-3kg (3 - 5 business days); 3kg+ (5 - 8 business days)
Free over £40 · Flat £6.99 below
Singapore (5 - 8 business days)
Free over S$40 · Flat S$9.99 below
European Union (6 - 10 business days)
Free over €49 · Flat €9.99 below
Malaysia (6 - 10 business days)
Free over RM40 · Flat RM9.99 below
🇦🇺Australia — Power Bank
| Weight | Fee |
|---|---|
| 0 – 0.51 kg | AU$ 24.39 |
| 0.51 – 1.01 kg | AU$ 36.99 |
| 1.01 – 1.51 kg | AU$ 55.99 |
🇬🇧United Kingdom — Power Bank
| Weight | Fee |
|---|---|
| 0 – 0.51 kg | £ 9.99 |
| 0.51 – 1.1 kg | £ 15.99 |
| 1.1 – 1.51 kg | £ 22.99 |
🇸🇬🇲🇾SG / Malaysia — Power Bank
| Weight | Fee |
|---|---|
| 0 – 0.51 kg | SGD 18.99 |
| 0.51 – 1.01 kg | SGD 23.99 |
| 1.01 – 1.51 kg | SGD 27.99 |
🇮🇪Ireland — Power Bank
| Weight | Fee |
|---|---|
| 0 – 0.51 kg | € 26 |
| 0.51 – 1 kg | € 39 |
| 1 – 1.51 kg | € 51.99 |
🇨🇦Canada — Power Bank
| Weight | Fee |
|---|---|
| 0 – 0.51 kg | CA$ 37.05 |
| 0.51 – 1.01 kg | CA$ 58.33 |
| 1.01 – 1.51 kg | CA$ 82.41 |
⚡ Express Shipping — free option available, refer to checkout.
📦 Heavy / Oversized items (e.g. water dispenser) — contact customer service for a custom freight quote.
Warranty
Maintenance Terms and Conditions / Warranty Information
DIGIBAL Official Warranty Coverage
This product is Authentic Hong Kong goods, enjoy Original factory one-year warranty (Unless otherwise specified on the product page). Customers must keep this information safe. Purchase receipts and products Hong Kong distributor of skin care stickers (It is recommended to take photos for record-keeping). If the product malfunctions during the warranty period, the customer must...Contact the Hong Kong general agent directly. Arrange for testing and repair.
🌏 Overseas (US / CA / UK / SG / AU)
All products are Hong Kong official versions supplied with a UK-style 3-pin plug. Travel adapters are not included. Warranty coverage ranges from 1 to 2 years, with all servicing performed in Hong Kong. Local return warehouses available in Australia, UK and USA.
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Local ReturnShipping costs are paid by the customer first.
Customer pays upfront
Ship to HK Maintenance arranged by the company
Warranty processed
Reimbursement Full refund upon presentation of receipt
Full refund of postage
Overseas customers may choose between the following two options:
For other countries, please contact customer service for a return address.
Sennheiser HD 660S2 open-back headphones｜38mm driver・300Ω・audiophile upgrade
classic HD 660S upgraded version, with deeper bass extension and better dynamics
📸 product main image
✨ detailed introduction
Sennheiser HD 660S2 open-back headphones｜38mm driver・300Ω・audiophile upgrade HD 660S2 is the upgraded model of the classic HD 660S, featuring a brand new 38mm dynamic driver and optimized airflow design, extending frequency response to 8 Hz–41,500 Hz, with deeper bass and stronger dynamics. It is an open-back headphone, providing a wide and transparent soundstage, suitable for audiophiles seeking natural and delicate sound; comes with 6.3mm and 4.4mm balanced cables for easy pairing with different amplifiers.
🔧 product features
— new driver design enhances bass and dynamic performance.
— frequency response extends to ultra-low and ultra-high frequencies.
— open structure brings a wide and natural sense of space.
— includes one 6.3mm and one 4.4mm balanced cable.
— Sennheiser's signature comfort and durable design.
— produced at Sennheiser's factory in Ireland.
🏠 usage scenarios
🏆 why choose this model?
- upgraded 38mm driver:— new driver design enhances bass and dynamic performance.
- 8Hz–41.5kHz:— frequency response extends to ultra-low and ultra-high frequencies.
- open soundstage:— open structure brings a wide and natural sense of space.
🖼️ product detail gallery
📋 specifications
| headphone type | open-back, over-ear |
| driver type | dynamic, open (38 mm) |
| frequency response | 8 Hz – 41,500 Hz |
| impedance | 300 Ω |
| sensitivity (SPL) | 104 dB (1 kHz / 1 Vrms) |
| total harmonic distortion (THD) | < 0.04 % (1 kHz / 100 dB) |
| connector | 6.3 mm plug + 4.4 mm balanced plug |
| cable length | 1.8 m + 1.8 m |
| country of origin | Ireland |
| product number (SKU) | 700240 |
| packaging contents | HD 660S2 headphones, 6.3mm cable (1.8m), 4.4mm balanced cable (1.8m), 6.3mm to 3.5mm adapter, portable storage bag |
⚖️ Sennheiser HD 6 series (audiophile)
| model | type | connection | positioning |
|---|---|---|---|
| HD 600 | open-back | wired | audiophile |
| HD 650 | open-back | wired | audiophile |
| HD 660S | open-back | wired | audiophile |
| HD 660S2 | open-back | wired | audiophile |
| HD 620S | closed-back | wired | audiophile |
Note: The above are the models available in the same series.
❓ frequently asked questions FAQ
Q: What is the difference from HD 660S?
A: HD 660S2 is the upgraded version, featuring new drivers, frequency extended to 8 Hz–41,500 Hz, with better bass and dynamics.
Q: Is 300Ω hard to drive?
A: With higher impedance, it is recommended to pair with an amplifier or player for optimal performance.
Q: Is it open-back?
A: Yes. The open-back design provides a wide soundstage with some sound leakage.
Q: What cables are included?
A: One 6.3mm and one 4.4mm balanced cable.
Q: Where is it manufactured?
A: Produced at Sennheiser's factory in Ireland.
Q: Is it suitable for direct connection to a phone?
A: It can be driven directly but with limited volume; it is recommended to pair with an amplifier.
Source: https://us.sennheiser-hearing.com/products/hd-660s2; specifications are subject to official announcements for updates.
