Product Comparison: Sennheiser HD1 Free vs Sennheiser Momentum

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General Specifications
HD1 Free
Momentum (506231)
About the Product
The HD1 Free is the most compact Bluetooth headphone Sennheiser has ever built. True to the HD1 design and engineering philosophy, these in-ear headphones offer contemporary styling, ease of use and exceptional sound quality. They feature cutting-edge wireless technology like Bluetooth 4.2, Qualcomm aptX and ACC codec processing to deliver immaculate and satisfying hi-fi sound. The ergonomic design and four sizes of ear adapters ensure a comfortable fit for a premium listening experience.
Momentum In-Ear brings elegant styling and premium performance together. An ergonomic design crafted with precision using premium materials, they exude quality while delivering exceptional sound quality. The sonic signature is pure Sennheiser Momentum – balanced, with powerful bass, smooth mid-range and extended highs.
Size & Weight
3.5 in.
4.6 in.
5.5 in.
1.8 in.
1.2 in.
6.9 in.
4.8 oz.
6.4 oz.
What customers say about "Size & Weight"
Sennheiser HD1 Free Bluetooth Wireless Headphone
  • They are extremely light weight and are very comfortable in the ear. The buds block out all external noise and I found that once inserted, I never had to "readjust" the buds in my ear. The buds and cord were so light-weight you didn't realize that you had them on.
  • Two things in particular I really like are the fit and the light weight. Getting a perfect fit with earbuds can be tricky because everyone is different. However, these are extremely comfortable.
  • Very light weight that makes you feel wearing nothing and both earbuds ends are magnetic to protect them from falling off your neck.
  • Some may have issues with the weight of the remote/mic/battery pulling the earbuds out. While I didn't have a problem, my active teenager did so if someone wants to use them to workout/run, it is something to consider.
  • I attribute some of that problem to how they actually insert into your ear and the weight/type of lanyard.
  • The overall build quality is very good to excellent, my only problem was getting a perfect ear fit but still very adequate.
Sennheiser Momentum (506231) In Ear (iOS version)
  • The proper weight, good noise isolation, quality sound and no noise from your mic on the go.
  • Light weight and crisp mids, they feel really solid too. The only thing these ear buds severely lack is bass.
  • These are incredibly light. Some might think that means cheap, but really it just means your ears won't be weighed down by them for long listening sessions.
  • Earpieces were very light weight, and I also found a slit port opening at the top which I'm sure contributed to a wide airy soundstage.
  • The headphone pieces (not the silicon tips) are heavy and jut out of your ear quite a bit, causing a slight, but noticeable downward pull when in your ears
Headphone Fit
Built-In Microphone
Volume, Start/End call, Play/Pause
Volume, Play/Pause
Sound Isolating
Water Resistant
NFC pairing, Up to 6 hour battery life
Distinctive Styling, Ergonomically Engineered, Elliptical Cable, Dynamic Transducer
Cord Length
5.12 feet
What customers say about "Features"
Sennheiser HD1 Free Bluetooth Wireless Headphone
  • Pairing the earbuds with my Blackberry smartphone was super easy, more so than with a lot of Bluetooth products I've used lately.
  • The storage case is very nice as well. But, getting back to what matters most, the sound quality. Extremely clean, tight sound with good highs.
  • For the price these deliver on sound quality, light weight, great battery life, quick recharge and ease of connection.
  • From a sound perspective, I've found that Sennheiser products provide a well-rounded sound without any loudness or overexagerated bass response, and the HD1 Free seems to follow along those lines.
  • The only con to the headphones would be the transfer of sound into the earpieces when running, a common issue I have seen with any headphones with the rubberized wires leading into the earpieces.
  • Would like to see slightly better battery life
Sennheiser Momentum (506231) In Ear (iOS version)
  • I'm not a base head so this is some of the best quality sound I've experienced. It's super clear and crisp.
  • Sound quality is excellent, particularly at the mid and low frequencies. Very comfortable after several hours of use.
  • Works well with my iPhone 6plus. Easy to adjust volume and change tracks while on the go.
  • The earphone case was nice. They look good. They're smaller in person than they appear in the pictures. The volume buttons work.
  • Biggest gripe was the 90 degree phone jack - very poorly designed. I don't see enough reinforced cabling for earbuds so it needs to be a thing - especially for such a big brand like Sennheiser.
  • Higher frequencies can be very harsh depending on the playback device. On an iPhone I counter this by setting the equalizer to reduce treble, which results in absolutely incredible sound, but this shouldn't be necessary.
Warranty / Certifications
Manufacturer Warranty
2 year(s)
Other Information
99.95 $

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