Comparison and Difference Between
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Brand and Model Specifications
Information about the brand, model release date.
| Manufacturer | Sennheiser | Sennheiser |
| Model | HD 660S | HD 820 |
| Photo |  |
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| Release Date | 2017 | 2018 |
| HifiSpecs Rating | ||
| Amazon Rating | ||
| Price |
General Specifications
Type, design and features.
| Headphone Type | Over-ear (circumaural) | Over-ear (circumaural) |
| Earcup Design | Open-back | Closed-back |
| Noise Options | None | None |
| Transducer Technology | Dynamic | Dynamic |
| Microphone | No | No |
| Connectivity | Wired | Wired |
| Cable Length | ~3 m ~9.84 ft ~387.5 in |
~3 m ~9.84 ft ~387.5 in |
| Detachable Cable | Yes | Yes |
| Battery Life | - | - |
| Battery Quick Charge | - | - |
| Water Protection | No | No |
| Inputs | 6.35 mm, 4.4 mm, XLR-4 (optional) | |
| Controls | No | - |
| Foldable | No | No |
Technical Specs
Tech specifications of the headphones.
| Frequency Response [Hz] | 9 – 41,500 | 12 - 43800 Hz (-3 dB), 6 - 48000 Hz (-10 dB) |
| Impedance [Ohms] | 150 | 300 |
| Maximum Input Power [mW] | - | 0.5 |
| Maximum SPL | 104 | 103 |
| Distortion | < 0,04% | - |
| Driver Diameter | 44.1 mm | 56 mm |
Dimensions and Weight
Physical characteristics of the speakers (without stands).
| Length | ~7.7 in ~195.58 mm ~19.56 cm |
~7.6 in ~193.04 mm ~19.3 cm |
| Width | ~7.1 in ~180.34 mm ~18.03 cm |
~7.6 in ~193.04 mm ~19.3 cm |
| Height | ~3.6 in ~91.44 mm ~9.14 cm |
~4.4 in ~111.76 mm ~11.18 cm |
| Weight | ~0.6 lb ~272.16 g ~0.27 kg |
~0.8 lb ~362.87 g ~0.36 kg |
Packaging Info
Package dimensions and weight.
| Shipping Length | ~12.6 in ~320.04 mm ~32 cm |
~13.4 in ~340.36 mm ~34.04 cm |
| Shipping Width | ~10.1 in ~256.54 mm ~25.65 cm |
~11.4 in ~193.04 mm ~19.3 cm |
| Shipping Height | ~4.2 in ~106.68 mm ~10.67 cm |
~5.1 in ~129.54 mm ~12.95 cm |
| Shipping Weight | ~3.4 lb ~1542.21 g ~1.54 kg |
~8.38 lb ~3801.1 g ~3.8 kg |
Colors and Accessories
List of available colors and optional accessories.
| Colors |
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| Replacable Earpads | Yes | Yes |
| What's in the Box |
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Price and Warranty
Satisfaction is (not) guaranteed.
| Warranty | 2 Years | 2 Years |
| Amazon Price |
Review Comparison
Hifispecs' professional customer-reviews can help make up your mind.
| Available Reviews |
Disclaimers
Small print and stuff...
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