Sennheiser HD 650



  • Dynamic
  • Open-back
  • Impedance: 300 Ohm
  • Sound pressure level: 103 dB
  • Frequency range: 10 - 41,000 Hz
  • 3 m Cable with 6.3 mm stereo jack plug
  • Weight without cable: 269 g
  • Weight with cable: 346 g
  • Includes 20 cm adapter cable from 6.3 mm to 3.5 mm jack plug
Available since September 2019
Item number 471755
Sales Unit 1 piece(s)
Design Over-Ear
System Open
Impedance 300 Ohms
Frequency range 10 Hz – 41000 Hz
Adapter Yes
Replacable Cable Yes
Marrone/Argento Black
Sensitivity 103 dB
Max. SPL 103 dB
Type Of Connector Jack, mini-jack
Adaptor 1
Weight 269 g
Replaceable Cable 1
Colour Black/Gray
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Open-backed design for increased enjoyment

The Sennheiser HD 650 is a dynamic, open-backed headphone model that is manufactured in Ireland and combines a streamlined design with a richly-detailed sound reproduction in order to set a new standard in sound quality and listening enjoyment. Sennheiser's unwillingness to compromise is reflected in the HD 650's frequency response, which goes from an ultra-low 10Hz up to an impressive 41kHz, and the drivers are hand-paired according to detailed measurement values in order to provide the most exact match between the left and right channels, thus enhancing the sound quality even further and delivering a particularly homogenous response.

Sennheiser HD 650, full slanted view

Easy to service and a solid investment

The Sennheiser HD 650 headphones are designed to allow components to be replaced when required, so users can be sure that they have invested in a set of headphones that will be with them for a long time. The 42mm transducer features a 38mm diaphragm with an aluminium voice coil that allows a broad and natural-sounding frequency response with less than 0.05% non-linear distortion. With a maximum SPL of 103dB and an impedance rating of 300 ohms, the Sennheiser HD 650 is admittedly not one of the loudest models available, so a headphone preamp will be required in operation. The detachable cable is made from highly conductive OFC copper and optimally matched to the headphones to provide the best impedance, while its 3m length gives the user enough freedom of movement both in the studio and in the home recording environment. And the scope of delivery additionally includes a 20cm adapter cable with a 3.5mm mini-jack connector for those who want to use the Sennheiser HD 650 in combination with smart devices.

Detailed view of Sennheiser HD 650 earcup

For studio users and hi-fi afficionados

Thanks to its expertly balanced acoustics, the Sennheiser HD 650 reproduces the subtle details in the music that many other headphone models in the audio production sector leave undiscovered, which makes the HD 650 an ideal tool for professional studio operators. Audiophiles on the other hand can look forward to both a high-resolution sound and a well-balanced frequency response that does not excessively boost the treble frequency range. The open-backed design of the Sennheiser HD 650 also allows the sound to "breathe" properly, while the low-resonance construction of the earcups in turn allows the sound waves to expand in a correspondingly natural manner.

Sennheiser HD 650 headband with logo, detailed view

About Sennheiser

In June 1945, Prof. Fritz Sennheiser founded the Wennebostel Laboratory, which initially produced measuring equipment. Commissioned by Siemens in 1945, the young company developed the MD-1 microphone, which was launched in 1946. After the development of further microphones, the company was renamed Sennheiser Electronic in 1958. Two years later, Sennheiser introduced the MD 421 dynamic microphone, which is still in production today and still held in high esteem by many sound engineers. Further groundbreaking developments, such as the HD 414 headphones and the MD 441 microphone classic, hugely enhanced the company’s international reputation, eventually making Sennheiser one of the leading manufacturers of microphone and headphone systems in the world.

For editing, mastering, or simply listening

As mentioned above, the Sennheiser HD 650 is designed to provide a balanced response with no over-emphasis of any specific frequency range, which makes for hours of fatigue-free listening even during extended sessions and makes this model a great choice for studio operators looking to finely polish their audio material. What is more, the headphones are equipped with soft velour ear cushions and weigh just 269 grams without the cable, so they are light enough to be worn for long periods without becoming uncomfortable. Mixing engineers can thus also easily use these headphones for jobs that can take up their entire day. The manufacturer calls the HD 650 a reference model for making analytical signal assessments, which makes it a suitable aid for recording engineers that can even provide a highly detailed sound for mastering. And it goes without saying that these headphones promise to make simply listening to music a highly enjoyable experience.

217 Customer ratings

4.8 / 5

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152 Reviews

An etermal sound
GeckoVST 08.11.2021
I purchased the Sennheiser HD650s as I was looking for a set of open backed headphones with a neutral frequency response. After reading a lot of reviews and opinions I was convinced that this was the best choice in this price range and I have not been disappointed.

The sound is beyond anything I have experienced before, even while being driven from my Mackie audio interface's output. While the impedance of these headphones is high (300 Ohm) they are still fairly easy to drive, so do not feel pressured into buying an amp before trying them on your current setup, even my laptops inbuilt sound card could drive them to a satisfactory volume.

These are the most comfortable headphones I've ever owned and I have regularly worn these through long production sessions and work days. After the first couple of weeks, the clamp force reduced and they are very secure and light.

To note: The first set I purchased had a defect in the cable connection and Thomann was quite responsive, despite the brexit shipping disruptions and replaced my set within a month. The version currently being sold is produced in Romania not Ireland doesn't come with a storage / carrying box.

To conclude, the clarity and reproduction of these headphones is fantastic, even after 15 years in production, they are still competitive, truly an eternal sound!


Go for it.
Toothpaste 30.04.2021
I mainly use these headphones for mixing and mastering (along with my Adam A5X monitors).

Comfort & Quality:

They are very comfortable to wear for long hours. The headband and the earpads are soft but still firm enough. The plastic used on the headphones looks and feels somewhat cheap, although I personally didn't have any issues with it so far. I've read comments online from people with broken headbands though. So, let's just say that I'd expect a higher quality feel on headphones that cost more than 300 euros.

Only (very minor) problem I've had with these headphones so far has been the cable connection on the headphone end getting loose. Maybe the connector wasn't properly in place to start with, cause this only happened to me two times in the first few days of use. I can't really comment more on the built quality / durability yet, since I've only owned them for a couple of months now.

Very happy with the monitoring experience. It's very easy to work for long hours with these headphones and the mixes translate very well. The soundstage is not so huge (compared to some AKG open-back models) but it is still there. I generally use them in combination with Sonarworks Reference, which gives them the boost they need in the low end (where they originally lack a bit of energy) and a minor correction in the high mid range, but really, the correction Sonarworks does on these is very minor, which shows that the headphones are quite flat to start with.

Oh and a very important note: I've read a million comments online about how it's super difficult to drive these headphones / one would need a powerful headphone amp and so on... Not really!! My Original RME Babyface (which is notorious for having not enough juice on the headphone output) can drive these headphones perfectly well, that is, to hearing-loss-inducing levels with great clarity.. but then again, loudness is very subjective, so you should try and see(hear) for yourselves.

All in all, I'd definitely recommend these headphones!!


ProducerAdie 30.07.2021
I was having a bit of a nightmare finding headphones I could afford that were flat/transparent enough to mix with. After doing a LOT of research and reading reviews and watching comparison videos and people's views, I bought some Beyerdynamic DT990s. However, whilst people LOVED them, I found the 'smile' bass and treble too distracting, so did a load more research - till I found these Sennhiesers.

They were so much more expensive and so far out of my budget, that I was reluctant to risk it…but I di and I am so thrilled with them! The sound quality is amazing! I almost feel as though I am mixing through my speakers. I can trust the sound, it is very vibrant and not tiring - and work so well just straight out of the headphone socket too.... in fact, I prefer that to via a headphone amp (which makes it a little bassier - but still good).

I haven't used them yet for long periods of time, but I can feel they are a little tight on the head grip (width), hence one star off for comfort, but it's a small price to pay for such an amazing sound quality. As for build quality, they feel very solid, have a decent weight behind them and again, feel like you can trust them to perform for a long while! Thank you Thomann for the great price - I definitely couldn't have afforded them from anywhere else!


Reference headphones for a good reason
Rboggyz 13.05.2020
These have gone around as being reference headphones since the HD580 was launched. I have to say I cannot disagree with that at all. I am using them with a JDS Labs Element 2, and have compared them to the HD580s which I also own, as well as a couple of pairs of Beyerdynamic, the DT 770 Pro 250 Ohm and the DT 1770 Pro. The nature of those being closed back, a direct comparison is not exactly fair, however! The Sennheisers are more confortable, and sit very well in terms of sound quality. Bass is not as punchy, but it's still full of detail, they have excellent mids, I have noticed male voices sound beautiful on them. Highs are not fatiguing, nor faded, for my ears they are just right. One good comparison with the Beyers would be the soundstage. Although Sennheisers are open back, the soundstage is close and intimate. Overall I am very happy with the HD 650 and I can recommend them for everyone who wants a good pair of mid-range headphones.