YinyooKZ ES4 Earbuds Dual Drivers 1BA 1DD In Ear Headphones, KZ Earphones HiFi in Ear Monitor with Detachable 2 Pin Cable (With mic, Green)

I bought these KZ ES4, with the silver upgrade cable, because my last IEMs were having issues cutting out in one channel, and in short, they've blown me away. You won't find any headphones on Amazon that can beat this for £20; read on for my detailed impressions.Background: I've been interested in headphones for a number of years now, with my desktop setup being an O2 amp into HD 650s. On the IEM side, I've used various 'Chi-Fi' models for a couple of years, which is the name given to a growing category of headphones that are being released by Chinese manufacturers at sub-£30 price points with features previously exclusive to very expensive earphones, such as removable cables, dual drivers and over-ear shells. KZ are probably the most famous and widespread of these manufacturers, releasing many models that are well-known in the ChiFi community, with ever-increasing quality. My past models include the ROCK Zircons, KZ ZS3, TinAudio T2 and Uisii HM7s.Testing Method: Because IEMs are designed for portability, I tested them with my phone as the source (as I would use in normal life). My source is an LG G6, with the Quad DAC enabled and the silver upgrade cable used. For the purposes of this review, I used to following albums to base my opinions (all as FLACs): Kid A by Radiohead, Lateralus by Tool, Off the Wall by Michael Jackson, MTV Unplugged by Alice in Chains and Discovery by Daft Punk.Build Quality: It astounds me that these headphones only cost £20, including prime shipping. For that low amount, you're getting high-quality plastic ear shells (I recommend the cyan colour, it looks great!), with the seams flush and no gaps/bumps. Although I bought the silver upgrade cable, I was also impressed by the nice-looking included copper cable, which is a big improvement over the old rubbery stock KZ cable that came with my ZS3. The cables use the 2-pin socket, which I prefer over the rival MMCX connector because it feels less fragile, is easier to replace and doesn't swivel.Fit: Before I got the headphones, I was worried about the fit because I found the ZS3 to be uncomfortable. Thankfully, the fit is great with the ES4. As all the curves are very smooth and round, I find it sits flush against my ear. The included eartips are the KZ starline, which fit well and are a nice addition; I've previously bought a set separately because I like them so much, thus it's nice that they're included here.Sound quality: The important part of this review. The ES4 does not disappoint, and represents a huge leap forward from previous KZ models and other ChiFi models at this price. The sound is V-Shaped, meaning that the bass and treble are quite strong. However, unlike past headphones, the 'V' isn't very aggressive, meaning that the mids aren't overpowered. The bass is strong, with good extension and a nice 'thump' in bass-heavy tracks. It doesn't bleed into the midrange, which is important for clarity. Speaking of the mids, they are really good for a V-shaped headphones. Guitars sound powerful and clear, and vocals don't sound recessed which is important for the genres of music I enjoy. I'm also hearing a lot of details in these midrange frequencies which I haven't heard before in IEMs, such as certain background noises in 'Idioteque'. The treble, often an issue with KZ headphones, are really well done in the ES4. Unlike other cheap dual-driver headphones, the ES4 is not prone to sibilance, which allows for comfortable, longer listening sessions. The treble is still quite prominent, which allows the higher-frequency details to shine through. Overall, these headphones sound very coherent and a pleasing sound signature that will appeal to fans of a broad range of genres. They're better than all the other IEMs I've used, with the T2s on a similar level but at a higher price point.Summary: When you consider the impressive build quality, striking design, comfortable fit, removable cables, Prime shipping, Amazon customer service and most importantly, unbeatable sound quality in its price range, you're getting a brilliant little package here. Looking around on Amazon, the only other headphones at this price range are either stock headphones that come with mobiles, models from cheap, generic Chinese manufacturers or the lowest end models from big-name companies. Compared to these options. the KZ ES4 outclasses them in terms of sound and build quality, making them a no-brainer for anyone looking for an upgrade on their free headphones or an inexpensive pair to use when out and about. If you pick the mic option, they even become a good budget option for gamers looking for a decent headset that can be used for voice comms and in-game audio.

I am wearing the KZ ES4 IEMs right now as I write this, listening to music and jamming out.For around £20, these are the best earbuds I've heard, bar none. The comfort is very good, coudn't ask for more.The sound quality is more than acceptable for an IEM at this price.• The bass is present and punchy, providing you get a good seal with your choice or ear-tips, without being boomy or drowning out the rest of the song.• The high's get a little tinny sometimes and some of those higher frequencies sound slightly further away, as if they are dimmer and in the distance. This doesn't ruin the sound by any means, but it's a characteristic that I noticed when comparing them to other earbuds.My final point is with regards to other IEMs. For double the price of these (around £40) you can purchase a pair of TIN T2 earbuds. I would argue the investment is worth it. If your IEM budget can afford that, you won't be dissapointed with the metal build quality or the vastly superior sound of the TIN T2 earbuds.However, those are double the price of the KZ ES4. Anyone looking to spend this little on IEMs will be perfectly happy with these, as they sound better than most trash earbuds you would find in regular electornic shops.Don't sleep on these, but consider other options if your budget can stretch that far.

Product: "KZ ES4 Earphones Dual Drivers In-Ear Headphones Yinyoo" - CyanDespite superb audio performance for the price, these earphones seem to suffer from build quality issues.The two samples I have had have suffered from the exact same main issue. The first one after less than four months. The second one immediately on arrival. The issue is the sound cuts out almost completely, mostly in the left ear piece. This seems to be due to the base seating for the pin holes, into which you connect the earphone cables, is loose when wiggled side-to-side OR the internal contacts have excessive lateral clearance. Obviously, no one wiggles the pins deliberately, just that the pull of the cables will naturally move the pins.It is not the cables, since now I have a total of 3 cables - two from the samples and one upgrade cable - and I have tested it with all the cables; nor were there any other visible defects on the earphones themselves or wear and tear. If you push and hold the pin connectors with a hand, then suddenly the sound may work, release the pin connectors, and the sound will cut off.Effectively, there is no sound in at least one ear piece and glorious, if occasionally intermittent, sound in the other. Quite useless for stereo headphones! In addition, the metal memory wire on the cable of the first pair of earphones broke on the right side after a couple of weeks.After asking for some remedy on the latest pair of earphones, I was initially promised a replacement but neither it nor any information updates about the replacement were ever received after two weeks.These issues have made me quite wary about any more KZ earphones, even their higher end models.