SKU: 38163149676

Sennheiser HD 660S2 Open-Back Audiophile Wired Headphones - Black

Sale price$305.98 Regular price$339.98
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Ships within 48 hours · Estimated delivery Aug 2 - Aug 7

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Description

Sennheiser HD 660S2 Open-Back Audiophile Wired Headphones - BlackProduct Description: Sennheiser HD 660S2 wired headphones deliver detailed high fidelity audio with an open back design, natural soundstage, and enhanced low frequency extension. The precision matched 38mm dynamic transducers reproduce clear vocals, detailed instruments, and controlled bass for critical listening, music production, home audio, and audiophile entertainment. With a 300 ohm impedance, the HD 660S2 is designed for use with capable

Product Description:
Sennheiser HD 660S2 wired headphones deliver detailed high-fidelity audio with an open-back design, natural soundstage, and enhanced low-frequency extension. The precision-matched 38mm dynamic transducers reproduce clear vocals, detailed instruments, and controlled bass for critical listening, music production, home audio, and audiophile entertainment.

With a 300-ohm impedance, the HD 660S2 is designed for use with capable headphone amplifiers, DACs, audio interfaces, and premium home stereo equipment. Lightweight construction, soft velour ear cushions, and an ergonomic over-ear fit provide lasting comfort during extended listening sessions.

The headphones include both a standard 6.3mm cable and a balanced 4.4mm cable, plus a 3.5mm adapter and protective carrying pouch.

Key Features:

  • Premium open-back audiophile headphones
  • Detailed, natural sound with enhanced sub-bass response
  • Precision-matched 38mm dynamic transducers
  • Ultra-light aluminium voice coils
  • Wide frequency response from 8Hz to 41,500Hz
  • 300-ohm impedance for high-quality amplified listening
  • Open ear cups provide a spacious, natural soundstage
  • Over-ear design with soft velour ear cushions
  • Lightweight 260g construction
  • Includes standard and balanced audio cables
  • Detachable cable design
  • Made in Ireland
  • Ideal for critical listening, home audio, mixing, and music enthusiasts

Specifications:

  • Brand: Sennheiser
  • Product Type: Wired Audiophile Headphones
  • Model: HD 660S2
  • Colour: Black
  • Headphone Style: Over-Ear
  • Acoustic Design: Open-Back
  • Transducer Type: Dynamic
  • Transducer Size: 38mm
  • Frequency Response: 8Hz–41,500Hz
  • Impedance: 300 Ohms
  • Sound Pressure Level: 104dB at 1kHz / 1Vrms
  • Total Harmonic Distortion: Less Than 0.04%
  • Cable Length: 1.8m
  • Connections: 6.3mm Stereo and 4.4mm Balanced
  • Adapter: 6.3mm to 3.5mm
  • Wireless Connectivity: No
  • Noise Cancellation: No
  • Weight: Approximately 260g
  • Included Components: HD 660S2 Headphones, 6.3mm Cable, 4.4mm Balanced Cable, 3.5mm Adapter and Carrying Pouch
  • Condition: New
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 38163149676

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r hodgdon
Louisville, US
★★★★★ 5
Very good quality. True to size
Size: Large, Color: Port Red
Quality and size are very good
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 23, 2026
J
Verified Purchase
JPC
Grantham, US
★★★★★ 4
Decent Shirt
Size: X-Large, Color: Riviera Blue
Like this shirt. Fits me well however does have some wrinkling. Great color.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 31, 2026
S
Verified Purchase
Sean
West Palm Beach, US
★★★★★ 5
Good
Size: X-Large, Color: Riviera Blue, Size: X-Large, Color: Riviera Blue
I got XL which is my normal size. It’s a bit roomy which I think is exactly what I wanted for a work shirt. I wanted it to be a no tuck shirt, but it’s too long for that. I’m really disappointed there, but it’s not a dealbreaker. The sleeves are a bit long, but my arms are short, so I will modify it or roll them up, not an uncommon problem for me with shirts but it’s not too bad either. The material is soft and would be good for summer or under a jacket. Someone posted about the collar being messy and that made me nervous to get this shirt, but I have washed it once and the collar remains in good shape. It stands up properly. The wrinkleproof seems to be pretty good.
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Reviewed in the United States on February 18, 2026
S
Verified Purchase
Sheryl Clerico
Charlottesville, US
★★★★★ 5
It fits well,and looks good
Size: X-Large, Color: Tuq Seabed
I gave this as a gift,my son loves it
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Reviewed in the United States on April 16, 2026
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Nobody
Chelsea, US
★★★★★ 3
Good shirt
Size: X-Large, Color: Bel Air Blue
This is a good shirt, I’m 5’ 9” and 220 (old dad bod 50’s), it fits well and the sleeves are a good length. My only thing I don’t like and this is nit-picking: it wrinkles easy. I’m ex military so I like my shirts ironed or pressed, I get it it’s more casual, it’s just my preference. This is a comfortable shirt
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Reviewed in the United States on December 12, 2025

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