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“The Sennheisers have a charming smoothness to their sound...” What Hi-Fi
Specifications
| Article number (SKU) | 700240 |
| Transducer principle | dynamic, open |
| Transducer size | 38 mm |
| Frequency response | 8 – 41,500 Hz |
| Impedance | 300 Ω |
| Sound pressure level (SPL) | 104 dB (1 kHz, 1 Vrms) |
| Total harmonic distortion (THD) | <0.04% (1 kHz, 100 dB) |
| Ear coupling | Over-Ear |
| Weight | 260g |
| Adapter | 6.3 mm (1⁄4 inch) to 3.5 mm |
| Connector | 6.3 mm (1⁄4 inch) jack plug, 4.4 mm balanced plug |
| Cable length | 1.8m |
| Cable length | 1.8m |
| Country of origin | Ireland |
| Magnetic field | 4.5mT |
| What's included | HD 660S2 headphones |
| 6.3 mm cable (1.8 m), 4.4 mm cable (1.8 m) | |
| 6.3mm to 3.5mm adapter | |
| Carry pouch |
Warranty
Shipping & Returns
We offer free shipping on any order over $150. For full details please see our Shipping Policy.
Our returns policy lasts 30 days. If 30 days have gone by since your purchase, unfortunately, we may not be able to offer you a refund or exchange. For full details please see our Refund Policy.

TELL ME MORE ABOUT THE
Sennheiser HD 660 S2 Open Back Headphones

Extended Sub-Bass for Deeper Impact

Natural, Warm & True-to-Life Sound Signature

High-Impedance Audiophile Performance (300Ω)

Open-Back Design for Wide Soundstage

Premium Build Quality (Made in Ireland)

Exceptional Comfort for Long Listening Sessions
“The Sennheisers have a charming smoothness to their sound...”

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