Sennheiser HD 660S2

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Sennheiser HD 660S2

Sennheiser

HD 660S2

4.5 Expert Rating

Product Info

Article Number: 557336
Model: HD 660S2
Price: $548.90

* Prices may vary. Check retailer for current pricing and availability.

The HD 660S2 is a refinement of an already excellent headphone. It's a real step up in bass presence while retaining the signature Sennheiser clarity. Ideal for audiophiles and music enthusiasts who appreciate a balanced, detailed sound and are willing to invest in a quality amplifier.

Product Description

  • Sennheiser HD 660S2
  • Headphones
  • Wired
  • Circumaural
  • Open design
  • Dynamic
  • Frequency range: 8 - 41
  • 500 Hz
  • Impedance: 300 Ohm
  • Sound pressure level: 104 dB (1V)
  • Driver size: 38 mm
  • Distortion factor: <0.04% (1 kHz
  • 100 dB)
  • Velour ear pads
  • Two-sided cable routing
  • Weight: 260 g
  • Colour: Black
  • Incl. 1.8 m cable (6.3 mm stereo jack)
  • 1.8 m cable (4.4 mm balanced)
  • 6.3 mm to 3.5 mm stereo adapter and carrying pouch
  • Made in Ireland
PROS
  • • Improved bass response over the original 660S, feels more impactful.
  • • Velour ear pads offer enhanced comfort for extended listening sessions.
  • • The dual cable setup (3.5mm/4.4mm) provides versatility for various setups.
  • • Excellent detail retrieval; instruments sound remarkably clear and distinct.
CONS
  • • 300 Ohm impedance demands a decent headphone amplifier for optimal performance.
  • • The open-back design isn't ideal for noisy environments or private listening.
  • • Velour pads, while comfortable, can be prone to absorbing moisture and odors.

Product Video

Key Features

Type Open-back, Dynamic
Driver Size 38 mm
Impedance 300 Ohm
Frequency Range 8 - 41,500 Hz
Sensitivity 104 dB (1V)
Cable 1.8 m (6.3 mm stereo jack) & 1.8 m (4.4 mm balanced)
Weight 260 g

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Frequently Asked Questions

The soundstage is present and airy, but not as expansive as the HD 800 S – it’s more intimate and focused.
The 3.5mm connection is perfectly fine, but the balanced connection offers a subtle improvement in channel separation and dynamics with a compatible amplifier.
Yes, the S2 addresses that criticism; the bass is more substantial and the overall presentation feels fuller and more complete.

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