The Sennheiser HD 4.40 are okay mixed usage over-ear headphones that can be used for a variety of use cases. They don’t excel in any usage but can be very versatile. Their sound is decent, and you also have a great EQ that lets you customize it to your liking. Unfortunately, they lack an ANC feature to be a good option for commuting, unlike the Sennheiser HD 4.50 BTNC. On the upside, they have low latency for Bluetooth headphones, so most people might not notice the delay when watching video content. They're a good option if you’re looking for headphones that can do a bit of everything without breaking the bank.
The Sennheiser HD 4.40 BT headphones are very similar to the Sennheiser HD 4.50 BTNC, but they don’t have a noise cancelling feature. They are decently well-built headphones and they feel less tight than their ANC variant. The ear cups are well-padded, but the headband lacks padding, which you can feel after a while. On the upside, they come with an audio cable to use the headphones wired, even if the battery is dead.
The Sennheiser HD 4.40 BT look fairly similar to the Sennheiser HD 4.50, but they don’t have silver accents on the ear cups and headband, which makes them stand out a bit less. They are fairly low-profile over-ears and don’t have a very flashy design. The padding is decently thick on the ear cups, but there’s not much on the headband. The dark matte finish gives the headphones a high-end look but might feel a bit plasticky once in your hands.
The Sennheiser HD 4.40 are decently comfortable and have good padding on the ear cups. They feel a bit softer than the Sennheiser HD 4.50, but they are noticeably less tight, which people may prefer. The headphones are lightweight and don’t apply too much pressure on the head, which is good since the headband isn’t well-padded. Also, the cups are fairly small and shallow and might not be very comfortable for people with bigger ears. These headphones might get uncomfortable for long listening sessions.
The HD 4.40 BT don’t have the best control scheme and have similar flaws to the Sennheiser HD 4.50. The buttons are the same, and they feel cramped and unresponsive at times. You get call/music management, track skipping, and volume controls, which are common. However, the track-skipping switch also acts as a button to play/pause, so it feels very mushy and feedback is poor. On the upside, the volume rocker is good, but you get an audio queue for each volume change, which can get annoying.
The Sennheiser HD 4.40 are not very breathable. They have a tight fit and a decent seal around your ears which obstruct a good amount of airflow. They should be okay for casual listening and most use cases, but will make your ears sweat during more demanding activities like running and exercising.
The HD 4.40 BT are not the most portable over-ear headphones, but they can fold into a more portable format, which takes less space. However, the cups don’t swivel to lay flat, which would make them easier to slide in a bag or to wear around the neck.
The HD 4.40 and 4.50 are built the same way. They are lightweight but feel fairly durable. The cups feel dense and should survive a few accidental drops. However, the headband isn’t reinforced by a metal sheet like the higher-end Sennheiser PXC 550 Wireless. Overall, they feel a bit plasticky, but they don’t feel too cheaply made.
The Sennheiser HD 4.40 are stable enough for you to run with, but they still won’t be the best option for exercising or intense sports due to their bulky over-ear design. They aren’t as tight as the HD 4.50 and fall off your head more easily. On the upside, the wireless design also ensures that the headphones won't be yanked off your head, as there's no cable to get hooked on anything.
The Sennheiser HD 4.40 BT are decent-sounding closed-back over-ear headphones. They have a good, powerful, and extended bass and a well-balanced and accurate mid-range, but have an underemphasized treble range that lacks in detail. Also, their bass is slightly thumpy, which some may like, but is inconsistent across different users. Overall, these headphones will be suitable for a wide variety of music genres but will sound a bit on the darker side, so they may not be ideal for vocal-centric music. Their audio reproduction is similar to the HD 4.50, and we didn’t use any EQ settings from their app to measure their frequency response.
The Sennheiser HD 4.40 have excellent bass. LFE (low-frequency extension) is at 10Hz, which is excellent. Low-bass, responsible for thump and rumble, is overemphasized by almost 4dB, which adds a noticeable excess of thumpiness to the bass, but some may prefer this. Mid-bass, responsible for the body of bass guitars and the punch of the kick drums, is also overemphasized by more than 2dB. There’s also a small dip in high-bass, which results in a slight loss in warmth.
Also, their bass delivery varies noticeably across users, and is sensitive to the quality of fit, seal, and whether you wear glasses. The response here represents the average bass response, so your experience may vary.
The mid-range is great. There’s a small dip in low-mid as a continuation of the high-bass, which makes the vocals slightly thin. However, low-mid and mid-mid are well-balanced and within 1.5dB of our target. This is important for clear reproduction of vocals and lead instruments. High-mid, however, is over our target by more than 2dB, bringing a bit of excess intensity and projection to vocals/leads.
Like the Sennheiser HD 4.50, the HD 4.40 BT’s treble range is mediocre. The response throughout the range is fairly uneven and very underemphasized. The dips centered around 4.5kHz and 7.5kHz have a negative effect on the clarity and presence of vocals, leads, and cymbals.
The HD 4.40 BT have a mediocre frequency response consistency performance. These headphones are prone to consistency issues, especially in the bass range. The maximum variance measured across our five human subjects was about 8dB at 20Hz, which is noticeable. We also noticed that certain types of glasses could break the seal on these headphones and cause a drop in bass. In the treble range, they delivered fairly consistently but might be a bit sensitive to positioning.
The Sennheiser HD 4.40 have good imaging. Weighted group delay is at 0.35, which is good. The GD graph also shows that the group delay response is entirely below the audibility threshold. This results in a tight bass and a transparent treble reproduction. Additionally, the L/R drivers of our test unit were well-matched in frequency, amplitude, and phase response, ensuring accurate placement and localization of objects (voices, instruments, and video game effects) in the stereo field. However, these results are only valid for our unit and yours may perform differently.
The Sennheiser HD 4.40 BT have a sub-par soundstage. The PRTF graph shows an inadequate amount of pinna activation with low accuracy, and there's no notch present in the 10kHz area either. This suggests a soundstage that will be perceived as small and located inside the listener's head as opposed to in front. Also, since they are closed-back headphones, their soundstage will be perceived as less open-sounding than that of open-back headphones.
The Sennheiser 4.40 have a passable harmonic distortion performance. The bass range distortion is within good limits, but there are peaks in distortion in the treble range around 4.5KHz and 7.5KHz, which could make the sibilants on these headphones slightly harsh and impure.
The Sennheiser HD 4.40 have sub-par isolation performance. Unlike the HD 4.50, they're not noise cancelling, therefore they won’t block out lower frequency noises like engine rumbles. This means they won’t be a good option for commuting. Thankfully, since they don’t leak too much, you’ll be able to block even more ambient noise by raising your listening volume without disturbing the people surrounding you.
Their noise isolation performance is poor. Since they don’t have an active noise cancelling system, they don’t isolate against low-frequency noises like the rumble of airplanes and bus engines. In the mid-range, important for blocking out speech, they reduce outside noise by more than 10dB, which is okay. In the treble range, occupied by sharp S and T sounds and A/C noises, they isolate by over 31dB, which is good.
The leakage performance of the HD 4.40 BT is good. The significant portion of their leakage is between 450Hz and 2.5KHz, which is not too broad. However, the overall level of leakage is very low. With the music at 100dB SPL, the leakage at 1 foot away averages at about 35dB SPL and peaks at 45dB SPL, which is slightly quieter than the noise floor of an average office.
The Sennheiser HD 4.40 BT have a mediocre integrated microphone. In quiet environments, speech recorded or transmitted with this mic will sound relatively thin and noticeably muffled, lacking in detail, and might feel unnatural. In noisy situations, the mic will be able to separate speech from background noise in moderately loud environments, like a busy street, but will not do well in loud environments such as a subway station.
The recording quality of the mic is sub-par. The LFE of 306Hz results in a recorded/transmitted speech that sound relatively thin. The HFE is at 3.3kHz, making speech noticeably muffled and lacking detail. The response between the LFE and HFE points is quite uneven, suggesting an unnatural speech transmission.
The integrated microphone of the HD 4.40 is decent at noise handling. It achieved a speech-to-noise ratio of 20dB in our SpNR test. This means it will be able to fully separate speech from ambient noise in moderately loud environments but will struggle in loud places like a subway station.
The Sennheiser HD 4.40 have a great battery life that will last you for about 29 hours, which means you won’t have to charge them daily. Also, you can use them passively, even if the battery dies, which is very convenient. They are also compatible with the Sennheiser Captune mobile app, and you get access to a good EQ to customize their sound to your liking.
The HD 4.40 BT have a great 29-hour battery life. This will be more than enough for a normal workday, and you won’t have to charge them often. When you do, they only take about 2 hours to fully charge. Unfortunately, they don’t have a power saving feature, so be sure to turn them off when not using them. On the upside, you can use them passively with an audio cable even if the battery is dead, which is convenient.
These headphones support the Sennheiser Captune app. They don’t have as many features and controls as the HD 4.50 and Sennheiser PXC 550 Wireless, since they aren't noise cancelling. You still get a nice parametric EQ to customize their sound to your liking and have access to an in-app player, but that’s about it.
The Sennheiser HD 4.40 BT are Bluetooth headphones that can also be used wired when needed. Unfortunately, they don’t connect to multiple devices simultaneously like the HD 4.50 and Sennheiser PXC 550 Wireless do, but they support NFC, which is good. They also have excellent wireless range, but it seems to be a bit inconsistent at times. Also, while their latency is lower than most Bluetooth headphones, it might still be a bit high for watching video content and gaming.
These headphones are Bluetooth compatible. While they can’t connect to two devices simultaneously, they support NFC for a quicker and easier pairing procedure. If you really care about multi-device support, then consider the Sennheiser HD 4.50 BTNC instead.
You can use the included 1/8” TRS audio cable to use these headphones passively on pretty much any platform that has a headphone jack. However, their cable does not have an in-line microphone.
The wireless range of the Sennheiser 4.40 is excellent. We practically maxed out our facility during our testing procedures, but we noticed very different results. However, the wireless range was fairly inconsistent, and we could get results down to about 150ft of line-of-sight range. On the upside, with 52ft of obstructed range, you should be able to walk to the next room over without getting too many audio cuts. Note that wireless range is dependent on your signal strength and many other factors, so you may experience different results.
The latency of the HD 4.40 is good for Bluetooth headphones, which normally average around 200-220ms of delay. However, this will still not be optimal for watching videos and gaming. On the other hand, they support the aptX codec, which may give you an overall better performance and slightly lower latency, provided you have the right dongle/transmitter. Also, some apps and devices offer some sort of compensation, so you might not even notice the delay that much.
The Sennheiser HD 4.40 are decent mixed-usage headphones that set themselves apart by their amazing wireless range and low latency, which makes them more suitable to watch video content than most Bluetooth headphones. However, they don’t have a great isolation performance, since they lack an ANC feature like other similar Sennheiser models. If you’re looking for ANC headphones for your commute, take a look at our recommendations for the best noise cancelling headphones and the best over-ear wireless headphones.
The Sennheiser HD 4.40 BT might be a better option than the JBL E55BT for most users, thanks to its nice app that allows you to EQ the sound of the headphones to your liking. They also have very low latency for Bluetooth headphones and have a few more hours of battery life. On the other hand, the JBLs are slightly more comfortable and can be paired with two devices simultaneously. They also come with a cable that has an in-line microphone, which the HD 4.40 lacks.
The Sony WH-CH700N are slightly better headphones than the Sennheiser HD 4.40 BT. They have a great audio reproduction and have over 30 hours of battery life. Their control scheme is noticeably easier to use, and they have an ANC feature, though it doesn’t seem to isolate against ambient noise that well. The Sony app is also great and offers multiple controls and customization. On the other hand, the Sennheiser headphones have low latency for Bluetooth and take noticeably less time to charge. However, they won’t be as comfortable as the WH-CH700N.
The Sennheiser HD 4.40 BT are better mixed-usage headphones than the Skullcandy Hesh 3, thanks to their app that gives you access to a good EQ. They also have less latency, which is good for watching videos. Other than that, they are similarly performing headphones; they even have a very similar look. The Hesh 3 might be a better choice for you if you like bass-heavy genres.
The Sennheiser HD 4.50 are more versatile headphones than the Sennheiser HD 4.40 BT due to their ANC feature, which makes them suitable for commuting and at the office. Other than that, these two models are practically the same and perform quite similarly. The HD 4.40 is also a bit less tight on some heads, which can be more comfortable for people with bigger heads. They also have a bit less latency, which is noticeable when watching videos.