Sennheiser HD 4.40 BT Wireless Around Ear Headphones Review

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Sennheiser HD 4.40 BT Wireless Around Ear Headphones Review

When we wrote our Sennheiser HD 4.40 around ear Bluetooth wireless headphones review, we realized that first of all it is necessary to emphasize that they have excellent controls, and offer a very good sound quality. Even though it is not expected less from a company with the prestige of Sennheiser, the headphone are of real premium quality. Regardless of the kind of music that you like to listen to, the performance of these headphones is simply amazing showing a very balanced sound,  deep bass and a clean and crisp treble.

Its wireless capability comes with Bluetooth 4.0 technology compatible with aptX codecs, which also generate a really good transmission of the WIFI signal, that doesn’t lose sound quality, meaning that they are a very reliable product that work great.

Specifications Of The Sennheiser HD 4.40 BT

  • Impedance: 18 Ω
  • Sound Pressure Level: (SPL) 113 dB (Passive: 1 kHz /1 Vrms)
  • Frequency Response: 18 – 22,000 Hz
  • Bluetooth: 4.0
  • Total Harmonic Distortion: (THD) <0.5% (1 kHz / 100 dB)
  • Dimension: 7.1 x 3.9 x 10.2 in.
  • Headphones Weight: 7.9 oz.
  • Battery Life: Up to 25 Hours       

HD 4.40 BT Wireless Headphones Features

  • Controls: Ear cup mounted
  • Ear pads Material: Soft leatherette 
  • Headband: Foldable of strong confection


One of the main pros of these headphones, is that doesn't cause any pain when wearing it, no matter how long you use them.

Another advantage is that when using the HD 4.40 BT headphones you will have the controls on your fingers without touching your smartphone, because you will be able to choose the tracks that you want to listen to from it, and beyond that the product allows you to answer calls from the headset itself.

Another aspect that we liked, is that you can quickly pair your mobile device with it, without the need of extra knowledge or read a manual to do it. The pairing takes just a short moment, and in no time we can enjoy the great experience of listening music with this awesome device.


Some people complain about the small size, but we think is a matter of preference.


The headband is very comfortable and lightweight. We really forgot it after put on the head. It's quite soundproof, I even tried it without music just to test how isolated it is, an it was perfect. About the sound, I must say that my last headset was also a Sennheiser, so I am quite used to its high quality. It is a versatile headset, with good specialization, balanced sound at all frequencies. The Bluetooth connection is reliable  and the pairing fast. An advantage is that several devices can be paired at the same time, which allows very fast switching from one source to another (but the key is not automatic, and it is still necessary to disconnect it manually). The battery is  also of good quality. It has been quite a while from when  I got it,and I have used it several hours a day, and I still don't find any negative issue that affects its performance.

Video-Unboxing The Sennheiser HD 4.40 BT


Unlike the smaller headphones that only rest on the auditory pavilions, these headphones have larger cups that will completely cover our ears.  The pads are made of good quality material, and with a very ergonomic design that adapts to the form of your head allowing you to enjoy more comfort when using them.
As these headphones are closed with a good fit of the pads around the ears, the product offer a good level of isolation from ambient noise around us, something that can be important if we want to use them when we are for example using public transport or when at home with the family.

In the upper part of the pads, exactly where the headband begins, it is possible to see on each side, the small panel that facilitate the managing of it. The buttons also help to calibrate the sound and intensity of this, operating like an equalizer in each of the speakers, so you can listen to a different sound in both ears without  distorting the melody , The location of the buttons is comfortable and its usage intuitive. It is also important to remember that the Sennheiser HD 4.40 BT comes with a microphone.

Bluetooth Of The Sennheiser HD 4.40 BT

The freedom of movements that involve the use of these Bluetooth headphones allows you to listen to music without depending on where the cable are or where the mobile is, and also the ability to answer calls taking advantage of its included microphone (that is cleverly hidden in the headset). The pairing with the mobile is very easy thanks to the fact that it has NFC technology

When using it, we can also control several functions that conventionally would operate via the mobile phone, like : answering calls, changing tracks or adjusting the volume, which are easily executed from the buttons on the cup of the headphones themselves.


Autonomy is a critical point that worries many people when thinking about to buy this type of popular accessories. We would say that is something that Sennheiser engineers have managed to solve  very efficiently.

When talking about usage, with a full charge you can enjoy up to 25 hours of use without having to recharge them. And in addition, the time that is required to fully charge the battery is only 2 hours, which is especially appreciated if we are in a hurry and want to enjoy our music on a long trip.

Video Tutorial-Connecting The Sennheiser HD 4.40 BT To Your Mobile

Controls Of the Sennheiser HD 4.40 BT Headphones

The company says that the controls of the headphones are very intuitive and its location makes easy to handle the different functions that comes with it. We agree completely , and also we would add that the fact that for example the microphone is so well hidden, make the lay out of the different pieces almost perfect. You are not going to need any sophisticated instructions to using the headset for phone calls or executing any task over it. We think that most of the people will be comfortable when using the product after a really short period of time.

Buyers Opinion

As expected, the opinions about the Sennheiser HD 4.40 BT headphones have all been positive, as everyone who has tried these headphones has fallen in love with their versatility. Among the best comments and recommendations of the clients who have used it are those who recommend it because the headband of them is padded, which prevents it from slipping at all times. It will be fixed in your ears until you separate them yourself.

Many of those who have bought them to relax on the sofa while listening to music or for their plane trips, have been delighted because they are very light and comfortable. In addition, they can be paired or docked with mobile devices such as the iphone very quickly.

The general opinions regarding sound, are that they are surprised how Bluetooth headphones can offer such excellent audio quality without sound latency. bad bass or poor mids.

Well, that's really why the Sennheiser manufacturers have worked hard to offer us this fantastic headphones.

HD 4.40 BT Wireless Sound Quality

Sound quality is one of the strengths of the Sennheiser HD 4.40. The drivers of these headphones are from the HiFi line of Sennheiser, with a detailed, balanced sound and dynamic bass. This is achieved, because the incorporation of the aptX codec, which optimizes the sound quality of the headphones, taking advantage of the bandwidth of the Bluetooth connection. The frequency response of the headphones reaches from a significant low 18 Hz, that guarantee a good bass, to an awesome 22 kHz, that gives you a great quality in treble, being able to reach a considerable 113 dB of maximum pressure in passive mode (connection by cable to an amplifier or source) or with a harmonic distortion of less than 0.5% (measured at 1kHz and with a pressure of 100 dB).

All this together with a passive noise cancellation system that uses pads surrounding the ears makes the sound experience outstanding. With very powerful bass,  also let the mids and treble to be enjoyed, adding a sound definition that will delight the most demanding.

Wireless Capability

Sennheiser HD 4.40 BT Wireless Headphone Manual


Question1: Are these around the ear headphone?

Answer: They are considered around the ear headphones, but for portability reasons they are on the smaller size range, so if you have big ears they will not be covered.

Question 2: Do I need a charger?

Answer: We recommend charging the headphones using only the supplied USB cable. When charging the headphones using an external USB power adapter, it is recommended to use a unit with an output rating of 500 mA or higher, which is the level that the majority of smartphones adapters come with.

Question 3: Anyone know stats on noise reduction?

Answer: These are not Active Noise canceling Headphones. Nevertheless the Noise isolation is quite good. The ear cups are small and they fit around the ears hermetically. I think that is the main reason why the noise isolation is so good.

Question 4: Is the battery replaceable? It will not work forever, will it?

Answer: Yes, the battery is replaceable but Sennheiser recommends that the replacement should be done by an authorized dealer. It is a lithium ion polymer battery that normally will last for a long while before requiring a replacement.

Sennheiser HD 4.40 BT Wireless Around Ear Headphones Review Recap

Another model of this emblematic brand that is presented to us in the form of a headset, but made under a minimalist idea and thinking about the opinion of the users regarding the materials, which are of the highest quality. The headband is padded, it is adjustable and self-adjusting so it is ideal for any user, and no matter if hey are large or small, both will feel comfortable using these headphones. The highlight are the pads which are made in leatherette, which gives a detail of elegance giving you great comfort during listening.

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