Sennheiser HD 700 vs Sennheiser HD 660S2 – Detailed Specs Comparison (2026)

- Open, circumaural dynamic stereo headphones - Outstanding soundstage with a warm and balanced audio reproduction - Specially-tuned, highly efficient drivers capable of delivering high sound pressure levels - Highly optimised ventilated magnet system minimises air turbulence and harmonic, intermodulation distortion - Open-back ear cups facilitate transparent sound while showcasing cutting-edge industrial design - Ultra comfortable and luxurious velour earpads, silicone-treated headband for minimal headband resonance - Innovative and highly aesthetic dual-material yoke for better stability and eliminates negative influences to sound quality - Very low THD achieved by top-notch and extremely stable internal damping element - Symmetrical and detachable silver-plated oxygen-free four-wire copper cable for better conductivity at higher frequencies - Designed in Germany, assembled in Ireland - 2 year warranty

Plush ear cushions and open design for maximum comfort. Outstanding quality designed in Germany, made in Ireland. Intimate sound with great timbre and deep, accurate sub bass. Uniquely powerful vented magnet system for minimized distortion. Ultra-light aluminium voice coil with 300-ohm impedance for excellent impulse response.

The driver size differs between the two (NA vs 38 mm), which can influence sound depth, bass response, and overall audio clarity. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel. Impedance levels vary (150 Ohms vs 300 ohm), which can affect compatibility and audio output when used with different devices. In general, both options are suitable for everyday use including music, calls, travel, and work-from-home scenarios. There is a noticeable difference in weight (Approx 270 g vs 260 Gm), which may affect comfort during extended use. If you're comparing Sennheiser HD 700 and Sennheiser HD 660S2, both models offer a strong combination of sound performance, comfort, and modern wireless features. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. The frequency response differs (8 Hz - 44,000 Hz vs 8 Hz -41500 Hz), which can influence how well the headphones reproduce lows, mids, and highs. Sennheiser HD 700 and Sennheiser HD 660S2 offer different noise cancellation capabilities (NA vs AMBIENT), which can impact how effectively they block external noise.

Verdict: Both models are competitive, and your decision should be based on your usage needs and preferred features.

Top Differences

Noise Cancelling: NA vs AMBIENT
Driver Size: NA vs 38 mm
Weight: Approx 270 g vs 260 Gm
Impedance: 150 Ohms Vs 300 ohm

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Top Differences