Sennheiser HD 660S2 Headphones – Open-Back, Deep Bass
42mm dynamic drivers deliver extended frequency range from 8 Hz to 41.5 kHz.
300 Ohm impedance optimized for high-quality amplification sources.
Lightweight aluminum construction and detachable cables for comfort and durability.
Should You Buy This Product?
✅ Buy it if:
- you want reference-quality sound for critical listening at home
- you have a quality amplifier to drive the 300 Ohm impedance properly
- you prioritize comfort during extended music or mixing sessions
🚫 Avoid it if:
- you need headphones for commuting or noisy environments
- you prefer wireless convenience over wired audiophile performance
- you expect flawless build consistency at this price point
Bottom Line
Ideal for home audiophiles and studio professionals who prioritize sound fidelity and comfort over portability. Skip it if you need noise isolation or wireless connectivity for daily use.
What We Love & What to Watch Out For
- Extended frequency range from 8 Hz to 41.5 kHz captures every detail in your music
- Lightweight aluminum build with plush cushions lets you listen for hours without fatigue
- Detachable cables mean easy replacement if damaged — no need to replace entire headphones
- Open-back design creates a natural, spacious soundstage that feels like live performance
- Open design leaks sound both ways — unusable in offices, libraries, or around others
- 300 Ohm impedance demands a dedicated amplifier — won't reach full potential from phone or laptop
- Some users report channel imbalance and build inconsistencies affecting long-term reliability
- Wired-only design limits movement compared to wireless alternatives
One of the most comfortable open-back headphones in this price range — especially for listeners who'd otherwise need separate studio monitors.
How People Actually Use It
Evening music sessions: amplifier powered up, favorite album queued, settling in for detailed listening that reveals layers you've never heard before
Studio mixing work: monitoring tracks in a quiet room where the open soundstage helps you place instruments precisely in the mix
Critical audio evaluation: comparing different masters or formats where the extended frequency response reveals subtle differences
Editor Score
Use-case Fit — How well this product matches its intended use case and target user.
Market Satisfaction — Based on aggregated customer ratings and review sentiment on Amazon.
Market Momentum — Reflects recent sales trend via BSR (Best Seller Rank). See the chart below.
Market Rank Trend (BSR)
Product Gallery
Specifications Overview
- Impedance: 300 Ohms
- Connectivity Technology: Wired
- Water Resistance Level: Not Water Resistant
- Item Weight: 0.3 Kilograms
- Compatible Devices: Smartphone
- Wireless: No
- Noise Cancellation: No
- Control Type: Media Control
- Color: Black
- Audio Driver Type: Dynamic Driver
- Control Method: Touch
- Frequency Range: 8 Hz – 41.5 kHz
- Driver Size: 42 mm
- Headphone Jack: 1/4 inch TRS, 4.4 mm TRRRS
- Earpiece Shape: Oval
- Enclosure Material: Aluminum
- Specific Uses For Product: Music
- Cable Features: Detachable
- Style Name: Headphones
- Theme: Music
Price Comparison
The Sennheiser HD 660S2 is available from multiple retailers with varying prices and return policies.
Amazon
Price: $399.95
Free shipping with Prime. Easy returns within 30 days.
CHECK THE LATEST PRICE ON AMAZONNot Sure? Consider These Instead
For those seeking different features or priorities, there are strong alternatives in the premium over-ear headphone space.
Bose QuietComfort Ultra Wireless Noise Cancelling Headphones (2nd Gen)
Key highlights- Noise Cancellation: Yes
- Battery Life: Up to 30 hours
- Connectivity: Bluetooth 5.4
- Control Type: Touch
The Bose QuietComfort Ultra Wireless offers active noise cancellation and wireless convenience, making it a strong choice for travel or use in noisy environments. It trades the HD 660S2's reference sound and open-back design for portability and extended battery life.
Learn More
Edifier STAX Spirit S5 Wireless Planar Magnetic Headphones
Key highlights- Audio Driver Type: Planar Magnetic
- Battery Life: Up to 80 hours
- Bluetooth Version: 5.4
- Charging Time: Fast Charging
Edifier's STAX Spirit S5 combines planar magnetic drivers with wireless connectivity and long battery life, targeting users interested in audiophile-grade sound with modern convenience. Its closed-back design and multiple connectivity options offer a different listening environment compared to the HD 660S2.
Learn More
Frequently Asked Questions
Does the Sennheiser HD 660S2 require an amplifier?
Yes, due to its 300 Ohm impedance, the HD 660S2 performs best when paired with a dedicated headphone amplifier or high-quality audio interface.
Is the HD 660S2 suitable for outdoor or commuting use?
No, the open-back design does not provide noise isolation and the headphones are intended for quiet, stationary environments.
Can I use the HD 660S2 with a smartphone?
While technically compatible, most smartphones may not provide enough power to drive the headphones optimally, resulting in reduced audio quality.
Final Recommendation
The HD 660S2 excels at what it's designed for — delivering audiophile-grade sound quality and comfort for serious listening.
The lack of noise cancellation and wireless features is intentional, keeping focus on pure audio fidelity over convenience.
For dedicated listeners with proper amplification, these headphones offer a compelling reference experience that justifies the investment.
