The Jaybird X4 Wireless are great wireless sports in-ears that are versatile for everyday casual use. They block a decent amount of noise and barely leak. They are stable for most sports and portable enough to fit in your pockets. You can customize your sound to your liking with the MySound app, and they have decent battery life. They are very similar to the X3, slightly outperforming them for sound, but they keep relatively the same design.
The Jaybird X4 have practically the same design as the X3. Only the tips and stability fins are different. They are slightly more earbud-like, similar to the Freedom 2, and are made of a more transparent rubber. They are also portable enough to fit in most pockets like most in-ears, but the ear fit might still not be for everyone. The X4 are a bit more comfortable thanks to the ear tips not entering your ear canal as deeply as before. They are also rated IPX7 and should be more sweatproof and waterproof than the X3.
The Jaybird X4 look nearly identical to the Jaybird X3. Even the in-line remote looks the same, but the tips on the earbuds and the stability fins don’t have the honeycomb design. They have a sporty look but come in even fewer colors than the X3, which were already less colorful than the previous X2.
The X4 are more comfortable than the X3. The new earbud-like tips do not enter your ear canal as deep (similar to the Freedom 2), and they are a bit more comfortable than most in-ears. Unfortunately, like most in-ears, they’re not comfortable for everyone and can get fatiguing after long listening sessions. On the upside, they come with 2 comply foam tips that people usually find more comfortable.
The in-line remote of the X4 is pretty much the same as the X3. Buttons are easily findable, and feedback is good. You get a volume control with track skipping and a basic play/pause button that also answers/ends calls. They are rated IPX7, so the in-line remote might be more sweatproof and waterproof than the X3, which is a nice addition considering reports that the X3 remote would stop charging after a few usages.
The build quality is the same as the X3. The cable is flat, and the headphones feel solid enough to survive a few drops without damage. They are also rated IPX7, but as of right now, we don’t have any way to test this in our current test bench. Unfortunately, the cord management clips were replaced by a cinch that some people don’t seem to like as much.
The Jaybird X4 are stable headphones for most sports. You’ll be able to run and train with them without any problem. They come with 4 tip options, of which 2 are comply foam tips and 3 stability fins for you to find the most comfortable and stable fit. Being wireless, they reduce the risk of them getting hooked on something and pulling the earbuds out of your ears. Although the stability fins look a little different, they are essentially the same.
The Jaybird X4 is an above-average sounding pair of closed-back in-ear headphones. They have a deep, consistent, and powerful bass, a great and even mid-range, and a well-balanced treble. However, their bass is ever-so-slightly muddy, their mid-range is a bit recessed, nudging vocals and other instruments towards the back of the mix, and their treble lacks some detail and is a little uneven on S and T sounds. Additionally, like most other in-ear headphones, they don't have a large and speaker-like soundstage.
Compared to the X3, the X4 have a slightly better-balanced bass and a more neutral sound.
The Jaybird X4 have a great bass. Their LFE (low-frequency extension) is at 10Hz, which is excellent. Low-bass and mid-bass are flat and within 0.5dB of our neutral target. This results in a deep and punchy bass with just the right amount of thump and rumble. However, high-bass, responsible for warmth, is overemphasized by more than 2.6dB, bringing a slight muddiness to the bass.
The Jaybird X4 have a great mid-range performance. The overall mid-range response is even and well-balanced, which is important for the clear and well-balanced reproduction of vocals and instruments. However, it shows about 3dB of recess centered around 700Hz. This nudges vocals and leads slightly to the back of the mix by giving more emphasis to bass and treble frequencies.
The treble response is good. Low-treble shows a 4dB dip around 4KHz, which will have a small negative effect on the detail and presence of instruments. The sibilance region (6KHz-10KHz) is a bit uneven, which makes some S and T sounds a bit sharp and some others a bit lacking. This will be mostly noticeable on vocals and cymbals.
The frequency response consistency is excellent. If the user is able to achieve a proper fit and an air-tight seal using the assortment of tips that come with the headphones, then they should be able to get consistent bass and treble delivery every time they use the headphones.
The stereo imaging is great. Their weighted group delay is at 0.12, which is great. The group delay graph also shows that the entire response is well below our audibility threshold. This ensures a tight bass and a transparent treble reproduction. Also, the L/R drivers of our test unit were very well-matched in frequency, amplitude, and phase response. This is important for the accurate placement and localization of objects (voices, instruments, video games effects) in the stereo image.
The soundstage is poor. This is because creating an out-of-head and speaker-like soundstage is largely dependent on activating the resonances of the pinna (outer ear). The design of in-ears and earbuds is in such a way that fully bypasses the pinna and doesn't interact with it. Also, because these headphones have a closed-back enclosure, their soundstage won't be perceived to be as open as that of open-back earbuds like the Apple AirPods, Google Pixel Buds, or the Bose SoundSport Free.
The harmonic distortion performance is average. The overall amount of harmonic distortion is elevated a bit in the treble range, especially at higher volumes. This could make the sound of those frequencies a bit harsh and impure. However, the THD produced in the bass range is within good limits, without a big jump in the THD under heavier loads.
The Jaybird X4 have good isolation performance but are outperformed by the X3. They passively block a decent amount of ambient noise, but they shine when it comes to leakage performance, like the X3. They barely leak, making them excellent headphones in quieter environments when you want to mask more noise by raising your audio volume without bothering people around you.
The isolation performance is about average. In the bass range, where the rumble of airplane and bus engines sits, they achieved almost 6dB of isolation which is mediocre. In the mid-range, important for blocking out speech, they reduce outside noise by more than 19dB, which is very good. In the treble range, occupied by sharp S and T sounds and computer fan noise, they isolate about 38dB, which is great. Compared to the original Jaybird X3, the X4 performs worse in the bass and treble ranges, probably due to their more earbud-like design.
The leakage performance is excellent. These in-ears practically do not leak, so you don't need to worry about disturbing people around you unless you are blasting your music in a very quiet room. With the music at 100dB SPL, the leakage at 1 foot away averages at 23dB SPL and peaks at 35dB SPL, which is noticeably quieter than the noise floor of an average office.
The Jaybird X4 have a sub-par microphone. In quiet environments, speech recorded or transmitted with this mic will sound relatively thin, muffled, and lacking in detail. In noisy situations, they will struggle to separate speech from ambient noise, even in moderately loud environments such as a busy street.
The recording quality the microphone is sub-par. Speech recorded or transmitted with the microphone will sound thin and muffled. This is due to LFE (low-frequency extension) being at 370Hz and the HFE (high-frequency extension) being at 3KHz. However, the limited high-frequency extension is a limitation of the Bluetooth protocol, and is a problem with all Bluetooth microphones. However, speech will still be decently intelligible on this microphone.
The in-line microphone is mediocre at noise handling. In our SpNR test, it achieved a speech-to-noise ratio of 13dB, indicating that they are best suited for quiet environments. But they won't be ideal for moderate and loud environments, as they will have difficulty fully separating speech from ambient noise.
The battery life is pretty much the same as the X3, and both headphones are compatible with the Jaybird MySound mobile app for more customization options like a parametric equalizer. Unfortunately, they come with a specific charging dongle that can be annoying if you don’t always have it on you.
The Jaybird X4 have about 7 hours of battery life, which is a bit over-average for most wireless in-ears models, with 1.7-hour charging time. They do not have any auto turn-off setting so be sure to turn them off if you plan on using them later in the day. The battery life can be a bit short if you plan to use them during your whole work shift, but most casual listeners will find it more than enough. Also, the proprietary charging dongle is restrictive, and you will need to keep it on you to charge your headphones at any moment.
Just like the X3, the X4 are compatible with the Jaybird MySound mobile app. It offers an excellent parametric EQ and lets you access community presets from other X4 owners. It doesn’t have an in-app player or room effects, but the app will still be a good tool to find the best sound profile for your liking.
The Jaybird X4 are Bluetooth only headphones that have bad latency, which won’t be good for watching video content or gaming. Their pairing protocol is simple, but they do not support NFC. On the upside, they have better wireless range than the previous X3 and can connect to 2 devices.
The Jaybird X4 can be paired with 2 devices which is great if you want to frequently switch between your phone and computer. Their pairing procedure is also fairly easy as you just have to hold the play button on the in-line remote for a few seconds.
These headphones don’t have any wired option.
The Jaybird X4 do not have a dock. If you want a headphone that's versatile and has a dock, try the SteelSeries Arctis 7. However, it won't be as compact and easy-to-carry around as the X4.
The wireless range is better than the X3. They have a longer range when the Bluetooth source was obstructed and in direct line of sight. It is perfect if you have your audio source like your phone on you, but should be fine if you also want to connect to a fixed source like a PC or TV.
The Jaybird X4 are one of the best wireless earbuds for working out that we've tested so far. They were designed as good wireless sports in-ears, but they are also versatile enough for everyday casual usage as well. Their sound quality is good for in-ears and they are more comfortable than most in-ears as the new ear tips don’t enter your ear canals as deeply. The new IPX7 rating is great for sports users who don’t want their headphones to get damaged because of sweat and water exposure. Unfortunately, their charging cradle can be frustrating at times because you always need it to charge the headphones instead of finding a more universal and common cable to connect directly to them. On the upside, they are also compatible with the Jaybird MySound app which offers good customization thanks to an excellent equalizer. Overall, they're one of the best wireless earbuds we've reviewed.
The Jaybird X4 are an upgrade from the X3. They are a bit more comfortable and have slightly better sound quality, especially in the treble range, but these results might be due to the different ear tips. They are also more waterproof being rated IPX7 while the X3 don’t officially have an IPX rating. On the other hand, the X3 have better noise isolation and slightly better latency performance, but both aren’t ideal to watch videos.
The Jaybird X4 and Tarah are very similar headphones, but the X4 have a slight edge over the Tarah. They have slightly longer battery life and better sound quality, with a bit overemphasized bass which can be great for sports music. However, both headphones are compatible with the Jaybird app which gives you access to an easy-to-use EQ. The X4 also has more options for a better fit and come with a soft pouch. On the other hand, the Tarah have a better wireless range. The X4 also have an in-line remote that doesn’t feel as cheap as the Tarah’s. So, if you feel like an extra $30 is worth extra fit options, a pouch and a better in-line remote, go with the X4; if not, get the Tarah.
If sound quality is the most important thing for you, the Bose Soundsport Wireless are better headphones than the X4. Their sound quality is better, and they are more comfortable. On the other hand, they barely isolate any noise and the X4 are the better pick in that category. The X4 also have over an hour more in battery life and the Jaybird Mysound app offers more customization than the Bose Connect app. The build quality is better on the X4 thanks to the waterproof IPX7 rating.
The Jaybird X4 are better wireless in-ears than the Freedom 2. They have better sound quality, a longer battery life, better leakage performance, better build quality and are rated IPX7. On the other side, the Jaybird Freedom 2 are more comfortable, which can be the most important factor for some people.
The Jaybird X4 are more comfortable than the BeatsX and have a longer battery life. They are also sweat and waterproof with an IPX7 rating while the BeatsX don’t have any rating. Both score equally in the sound category, but the bass to mid-mid is more even on the BeatsX while the treble range is better on the X4. For convenience, the Jaybird are more universal as they can be used with both Android and iOS and the app offers more customization than the iOS exclusive battery life pop up that the BeatsX offer. On the other hand, the BeatsX have better isolation performance and come with a small soft case while the X4 only have a pouch.