Sennheiser HD 660S2 - Black
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Product Information
Full details
The Sennheiser HD 660S2 headphones are designed for audiophiles seeking an immersive, natural sound experience. Their key benefit lies in enhanced bass response and a spacious soundstage, ideal for critical listening. A caveat is their open-back design, which means they are not suitable for noisy environments or for use where sound isolation is required.
All features
| Colour | Black |
|---|---|
| Headphones Noise Cancellation | None |
| Series | HD 660S2 |
| Model Part Number | 700240-1K |
| Brand | Sennheiser |
Extended Product Information
FAQs
Are these headphones suitable for use in a noisy office or commute?
No, the Sennheiser HD 660S2 features an open-back design, which means they offer very little sound isolation and will allow ambient noise in while also leaking sound out. They are best suited for quiet listening environments.
Do I need a headphone amplifier to use these?
While they will function with many devices, the HD 660S2 has a 300-ohm impedance. To achieve their full potential in terms of volume, dynamics, and clarity, it is highly recommended to use them with a dedicated headphone amplifier or a powerful audio output.
What is the difference between the 1/4" and 4.4mm cables?
The 1/4" cable is a standard unbalanced connection, commonly found on most audio equipment. The 4.4mm cable is a balanced connection, often found on higher-end audio players and amplifiers, which can offer improved noise rejection and signal integrity.
Can I replace the earpads?
Yes, the velour earpads are designed to be replaceable. If they become worn or uncomfortable, you can purchase replacement pads from Sennheiser or authorized dealers.
How do I clean the headphones?
Gently wipe the earcups and headband with a slightly damp, soft cloth. Avoid using any solvents or abrasive cleaners. Ensure the headphones are completely dry before use.
What is the warranty period for the Sennheiser HD 660S2?
Please refer to the official Sennheiser warranty documentation for the most current information regarding the warranty period and terms applicable to your region.
Troubleshooting
No sound from one earcup
Ensure the headphone cable is securely plugged into both the earcup and the audio source. Try using the alternative cable to rule out a cable defect. Test with a different audio source or device.
Low volume or weak bass
Confirm that the headphones are connected to a sufficiently powerful amplifier or audio source. The 300-ohm impedance requires adequate amplification to achieve optimal volume and dynamics. Check the volume settings on both the source and any intermediate amplifier.
Distorted or unclear audio
Verify that the audio source is not the cause of distortion by testing with another pair of headphones or a different audio file. Ensure the cable connections are secure. If using an amplifier, check its settings and ensure it is not clipping.
Earpads feel uncomfortable or worn
The HD 660S2 features replaceable velour earpads. Contact Sennheiser support or authorized retailers for replacement earpad kits if you experience persistent discomfort or notice significant wear.
Pros and Cons
Pros
- Exceptional clarity and detail in audio reproduction.
- Rich and extended bass performance, especially in sub-bass frequencies.
- Comfortable for long listening sessions due to plush velour earcups.
- Spacious and natural soundstage, characteristic of open-back designs.
- Includes multiple cable options for different audio sources.
Cons
- Open-back design offers poor sound isolation, making them unsuitable for noisy environments.
- Sound leakage means they are not ideal for quiet shared spaces.
- Requires a capable audio source or amplifier to drive the 300-ohm impedance effectively.
- Not designed for portability or active use due to the open-back nature.
Setup, Compatibility & Care
Setup: The HD 660S2 comes with two detachable cables: one 1/4" unbalanced cable and one 4.4mm balanced cable. Connect the desired cable to the headphone earcup by firmly pushing it in until it clicks. Use the included 1/4" to 3.5mm adapter if your audio source has a 3.5mm headphone jack.
Compatibility: These headphones are compatible with any audio source that has a standard headphone output (1/4" or 3.5mm via adapter) or a balanced output (4.4mm). Due to their 300-ohm impedance, they will sound best when connected to an amplifier or audio interface capable of providing adequate power. Lower-powered devices like smartphones or basic laptops may result in lower volume levels and less dynamic range.
Care: To maintain sound quality and comfort, regularly clean the earpads with a slightly damp, soft cloth. Avoid using harsh chemicals or abrasive materials. Store the headphones in the provided carry pouch when not in use to protect them from dust and scratches. Keep the cables dry and avoid excessive bending.