description Sennheiser HD 660S2 Overview
The Sennheiser HD 660S2 is the latest evolution of the legendary HD 600 series. It retains the iconic midrange magic that made the original series famous while improving the sub-bass extension and overall resolution. It is an intimate, warm, and incredibly musical headphone that is perfect for vocal-heavy music and long listening sessions. It is easy to drive compared to other high-end models, making it a great choice for those who don't want to invest in a massive desktop amplifier stack.
It is a true classic updated for the modern era.
info Sennheiser HD 660S2 Specifications
| Weight | 260 g |
| Connector | 6.35 mm stereo jack (3.5 mm adapter included) |
| Impedance | 300 ohms |
| Cable Type | Detachable, OFC copper |
| Sensitivity | 104 dB (1 kHz, 1 Vrms) |
| Cable Length | 3 m |
| Earpad Material | Velour |
| Transducer Type | Dynamic, open-back |
| Frequency Response | 8 Hz - 41,500 Hz |
| Total Harmonic Distortion | < 0.04% |
balance Sennheiser HD 660S2 Pros & Cons
- Exceptional midrange clarity and vocal reproduction that defines the HD 600 series legacy
- Improved sub-bass extension down to 8 Hz providing fuller low-end than predecessors
- High-resolution driver design reveals subtle details in recordings
- Open-back acoustic chamber creates a wide, natural soundstage
- Detachable 3m cable with 6.35mm termination for amplifier connectivity
- Lightweight at 260g with cushioned earpads for extended listening comfort
- High 300 ohm impedance requires a dedicated amplifier to reach optimal performance
- Open-back design allows sound to leak out, making it unsuitable for shared or quiet spaces
- No inline microphone or remote, limiting use with smartphones
- Rigid earpad material may cause discomfort during very long sessions
- Premium pricing positions it as a significant investment for hobbyists
help Sennheiser HD 660S2 FAQ
Do I need an amplifier for the Sennheiser HD 660S2?
Yes, the HD 660S2's 300 ohm impedance benefits significantly from an amplifier. While it can produce sound from mobile devices, an amp unlocks its full dynamic range, bass impact, and overall clarity. Desktop headphone amplifiers or dedicated DAC/amp combos are recommended.
How does the HD 660S2 compare to the HD 600 and HD 650?
The HD 660S2 improves upon the HD 600 and HD 650 with enhanced sub-bass extension (down to 8 Hz vs 10 Hz), refined treble for better air and sparkle, and a slightly warmer overall signature while retaining the beloved midrange magic that made the series iconic.
Is the HD 660S2 suitable for professional mixing and mastering?
The HD 660S2 excels at critical listening with its neutral midrange and accurate vocal reproduction. However, its warm, musical character means some professionals may prefer a more analytical reference headphone for mastering decisions.
Can I use the HD 660S2 with my smartphone or laptop?
Direct connection to smartphones or laptops is possible but not ideal. The high impedance results in lower volume and diminished bass authority. A portable DAC/amp dongle or compact desktop amplifier significantly improves the listening experience.
What is Sennheiser HD 660S2?
How good is Sennheiser HD 660S2?
How much does Sennheiser HD 660S2 cost?
What are the best alternatives to Sennheiser HD 660S2?
What is Sennheiser HD 660S2 best for?
Audiophiles and music enthusiasts seeking a warm, musical listening experience with world-class vocal reproduction for dedicated home listening sessions with proper amplification.
How does Sennheiser HD 660S2 compare to Sennheiser HD 650?
Is Sennheiser HD 660S2 worth it in 2026?
What are the key specifications of Sennheiser HD 660S2?
- Weight: 260 g
- Connector: 6.35 mm stereo jack (3.5 mm adapter included)
- Impedance: 300 ohms
- Cable Type: Detachable, OFC copper
- Sensitivity: 104 dB (1 kHz, 1 Vrms)
- Cable Length: 3 m
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