- International stock, 1-2 days fast dispatch.
- Estimated Delivery Time Frame: 5-7 Business days
- One Year Australian Seller Warranty.
- Due to health and hygiene reasons, headphones and some wearables can only be returned for a full refund if they are unopened within 30 days of purchase and are completely sealed or faulty. For this reason, if you change your mind about your purchase of headphones or wearable product they must be completely unopened.
The Sennheiser HD-660S2 Wired Over-Ear Headphone is a refined evolution of Sennheiser's open-back reference line, created for audiophiles who want a highly resolving yet musical listening experience. Its dynamic, open transducer design with 38 mm drivers delivers an expansive, natural soundstage with excellent imaging and separation. With a frequency response from 8 Hz to 41,500 Hz and an impedance of 300 ohms, the HD-660S2 reveals subtle low-level details, deep controlled bass, and airy treble that does justice to high-resolution recordings.
Tuned for clarity and low distortion, the HD-660S2 achieves a sound pressure level of 104 dB at 1 kHz, 1 Vrms, with total harmonic distortion kept below 0.04 percent at 1 kHz and 100 dB. Comfortable over-ear ear cups and a lightweight. The included 1.8 m cable terminates in a 6.3 mm jack plug with a 4.4 mm balanced plug option, plus a 6.3 mm to 3.5 mm adapter for flexible connectivity to a wide range of headphone amplifiers, DACs, interfaces, and portable players. Manufactured in Ireland with a precisely controlled 4.5 mT magnetic field, the Sennheiser HD-660S2 offers a premium, open and engaging sound that is ideal for serious music listening at home or in the studio.
| Transducer Principle | Dynamic, open |
| Transducer Size | 38 mm |
| Ear Coupling | Over-Ear |
| Frequency Response | 8 – 41,500 Hz |
| Impedance | 300 O |
| Sound Pressure Level (SPL) | 104 dB (1 kHz, 1 Vrms) |
| Total Harmonic Distortion (THD) | < 0.04 % (1 kHz, 100 dB) |
| Magnetic Field | 4.5 mT |
| Cable Length | 1.8 m |
| Connector | 6.3 mm (1/4 inch) jack plug, 4.4 mm balanced plug |
| Adapter | 6.3 mm (1/4 inch) to 3.5 mm adapter |
| Weight | 260 g |
- Dynamic open-back over-ear reference headphone with 38 mm drivers
- Wide 8 – 41,500 Hz frequency response and 300 ohm impedance
- Low distortion under 0.04 percent at 1 kHz and 100 dB SPL
- Includes 1.8 m cable with 6.3 mm and 4.4 mm balanced plugs plus 3.5 mm adapter
CONDITION - Unless stated in the product title, all devices are brand new. We do sell a small quantity of refurbished items but these all have a product title that begins with 'Refurbished'. As part of our QC process, retail package seals may have been opened to perform quality, testing and/or unlock functions however unless specified all devices are new and unused.
WARRANTY - All new devices come with our comprehensive 12 month warranty, which is included in the standard purchase price. We'll even replace with a new item if yours cannot be repaired. Refurbished items (marked as such in the product description) come with a 6 month warranty with refurbished replacement items.
PAYMENT METHODS - We accept Credit Card and PayPal for outright purchases. Though we also offer zipMoney for convenient repayments over time handled by zipMoney. Direct bank deposit is available to wholesale orders only, please get in touch with our CS team for further information.
RETURNS - All orders are liable to a discretional change of mind return fee. For more information please read our returns policy. We also offer a new replacement policy for items that cannot be repaired.
SECURITY - Our shopping cart meets the strictest PCI requirements and is audited daily. We do not store any customer payment information and our servers are protected using Digicert's SHA2 High Assurance SSL.
OUR STOCK - Products sold through this store are unlocked, never locked or SIM-free. They offer the best combination of price and quality and can be sourced from international markets via parallel importation. Please check the network bands with your provider to ensure full compatibility. In some instances printed documentation may not be in English, even though the device is compatible with local network bands. Where this occurs and you require user manuals etc please contact us and we will provide a digital copy.
DISCLAIMER - Due to variations in stock and regional sourcing we cannot guarantee that all specifications listed are 100% correct at all times as the same model may be available in several variants. If you have any specific requirements please raise them with our team and they will provide availability on the model you require.
