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OpenBox Sennheiser HD 660S2 Wired Audiophile Stereo Headphones
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OpenBox Sennheiser HD 660S2 Wired Audiophile Stereo Headphones

19,899 ₹ 49,990

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Product Description

38 mm open‑back dynamic drivers with intimate, relaxed tonal character and extended sub‑bass.

High nominal impedance of 300 Ω, requiring a quality headphone amp or DAC for optimal performance

Wide frequency response from 8 Hz to 41,500 Hz, with ultra‑low distortion (

🔍 Key Specs & Build

  • Driver Type & Size: 38 mm dynamic drivers, open‑back design. 
  • Impedance: 300 Ω — requires a decent headphone amp / DAC for best performance. 
  • Frequency Response: ~ 8 Hz to 41,500 Hz, giving wide bandwidth including deep sub‑bass and detailed treble. 
  • Sensitivity / Sound Pressure Level (SPL): ~ 104 dB (1 kHz, 1 Vrms) 
  • Total Harmonic Distortion (THD): < 0.04% (measured at 1 kHz / 100 dB) — quite low, meaning clean signal with little distortion. 

🎧 Sound & Performance

  • Sound Signature: Intimate, relaxed mids with improved bass presence (especially sub‑bass) over previous 6‑series models; smoother treble, less harshness. 
  • Open‑back design yields spacious soundstage and imaging; allows natural sound but also lets ambient noise in & leaks sound out. 
  • Resonant frequency has been lowered (from ~110 Hz in previous models to ~70 Hz) improving low‑end extension and giving more impactful bass in open‑back form. 

🛠 Comfort, Accessories & Use

  • Build & Fit: Plush velour ear pads, soft headband padding; relatively lightweight (~260 g). 
  • Cables: Comes with two detachable cables — one 1.8 m single‑ended cable with 6.3 mm jack; one balanced 1.8 m 4.4 mm cable; also adapter 6.3 → 3.5 mm included. 
  • Weight: ~260 grams (without cable).

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