Sennheiser · Open-Back Headphones
Sennheiser HD 660S2
~C$499
The Sennheiser HD 660S2 is an open-back audiophile headphone designed for critical listening at home with a dedicated DAC/amp. The redesigned 38mm transducers deliver improved bass response over the original HD 660S while maintaining Sennheiser's signature clarity and detail. The open-back design creates a wide, natural soundstage that closed-back headphones can't match. Impedance of 300 ohms means you'll need a headphone amp to drive them properly. Includes both 6.35mm and 4.4mm balanced cables.
Read on Celmin Magazine →Pros
- + Reference-grade sound
- + Improved bass over HD 660S
- + Extremely comfortable
- + Detachable cables
- + Made in Germany
Cons
- - Open-back leaks sound
- - Needs an amp for best results
- - Not portable
- - No wireless option
Key Specs
- Dimensions
- 7.7 x 3.9 x 10.2 inches
- Weight
- 260g
- Cable
- Detachable, 6.35mm + 4.4mm balanced
- Weight
- 260g
- Impedance
- 300 ohms
- Driver Size
- 42mm
- Frequency Response
- 8Hz-41.5kHz
Our Verdict
A true audiophile headphone that rewards you with every detail in your music. The HD 660S2 is a modern classic.
Best For
Home audiophiles and music producers who want reference-grade sound
How It Compares
| Spec | Sennheiser HD 660S2 | FiiO K7 Desktop DAC/Amp |
|---|---|---|
| Price | ~C$499 | ~C$270 |
| Cable | Detachable, 6.35mm + 4.4mm balanced | — |
| Weight | 260g | — |
| Impedance | 300 ohms | — |
| Driver Size | 42mm | — |
| Frequency Response | 8Hz-41.5kHz | — |
| Inputs | — | USB, Optical, Coaxial, RCA |
| Outputs | — | 4.4mm balanced, 6.35mm SE |
| DAC Chip | — | Dual ES9038Q2M |
| Output Power | — | 2000mW at 32ohm |
Frequently Asked Questions
Do I need a headphone amp?
At 300 ohms, a dedicated headphone amp or DAC/amp combo is recommended for optimal performance.
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