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Koel - Balanced Armature Earphones

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  • The Koel are a lightweight and ergonomic earphone, created to sit comfortably in the ear for true fit-and-forget experience. The unique shape has been designed and printed in-house using state-of-the-art 3D resin printers and assembled using components from USA and Europe. We include a wide range of ear tips to give you perfect fit for the ultimate in sound quality and natural sound isolation, plus the included memory-formed cable make for a truly comfortable all-day listening experience.

    These Balanced Armature in-ear-monitors (IEM’s) play host to one of the finest earphone drivers around. They are tuned to produce a balanced and accurate sound signature, with little to no colouring, presenting a truly genuine audio experience that lets you hear the music as the artist originally intended.

    The Koel are a great introduction to the world of refined audio, now you get to re-discover and experience your favourite music all over again.

    Brainwavz unique approach to manufacturing means we are always in control, quick to develop and bring products to market, continuing the Brainwavz ethos of delivering the high-end audio experience to everyone at affordable prices.

Customer Reviews

Based on 15 reviews
do they stay in the ear, yes

them ear buds do reall good, hears good and stays good. cost a little to much but they do stay in your ear gooder than lots a them others. thank yall j gale

You need a good audio source to bring out the best in these

Bought this to replace my MEElectronics A151p which also has a BA driver. This is an awesome IEM for the price. Just make sure you consider your audio source before scrutinizing the sound it can produce.

Excellent. They sound great and they don't fall out.

Excellent. They sound great and they don't fall out. My standard Brainwavz ear-buds would always fall out of my ears whenever I was walking or doing anything besides sitting still, no matter which ear tips I used. These do not fall out. I'd buy again the next time they are on sale.

Five Stars

Great earphones! Very comfortable and sound great. A terrific bargain and worth every cent. Highly recommended!

Good quality IEM earphones for the price.

Good quality IEM earphones for the price.The sound has a nice balance to it, so you can feel the bass, but it isn't overpowering and the mids/treble are finely tuned.These are good earphones for music, movies and games.

Great Sound and Price

Simply put, these are amazing! The sound is so natural, and the fit so comfortable, I forget I'm wearing them. And with the more-than-reasonable price, I can't think of a higher recommendation.


Love the sound and love the product

Five Stars

Great fit and sound

Good bang for buck

They sound good (sound is as good as if not better than, with less background noise than the Shure 215s that they're replacing).They're super comfortable, I've worn them for hours at work with no issues.I wish the cord was longer, and a bit beefier, but those are minor complaints.

Surprisingly full sounding balanced armature earphone.

The B150 are one of the most expensive earphones in the Brainwavz range but still seem like very good value for money when you consider exactly what you are getting. The earphones are accompanied by a rigid carry case, a cable clip, cable tidy, 2 pairs each of small, medium & large silicon tips, a pair of Comply foam tips and a user guide. This kind of package is fairly common with Brainwavz products but coupled with an armature earphone makes this seem quite the bargain.The earphones themselves are of the in ear monitor (IEM) variety and designed to be worn with the audio cables over and down the back of the ears instead of hanging straight down. This has the benefit of offering more support to keep the earphones in place as well as cutting down on cable phonics. The housings are fashioned from plastic but do feel very solidly built. These are connected to your audio source of choice by a standard, round 1.3m cable which feels of good quality. Unfortunately, there is no inline remote or microphone which would have rounded out the package.As these are driven by a balanced armature, they can sound a little different from what people expect from a dynamic driver but a lot of it comes down to preference. Sonically, as I have come to expect from Brainwavz, these sound very good indeed and seem to punch above their weight for the price paid.They have a tight, well defined bass and highs that really do shine. The middle of the audio range is well represented and blend in nicely with the rest of the audio range. Depending on the track, vocals can really stand out but may not sound warm enough for some people's tastes. If you really want to listen and focus on the vocals though, these are a great earphone. Likewise, the top end can really sparkle without sounding overly bright as some people can find with armature earphones. For the record, these carry an official frequency range of 16hz - 22khz and a impedance of 30 ohms. This range suggests an impressive bass and while it is definitely there, it doesn't sound as heavy or pronounced as other earphones but definitely well delivered for a single armature design.The better the quality of the track, the more smaller details pop out and these earphones can be quite revealing. If you stick to lower quality 128kb tracks then you may not find these a particularly enjoyable listen as they can be quite unforgiving but feed them with higher bitrate music and you will be rewarded. I wouldn't describe them as very warm sounding, more clinical but I still prefer the overall sound of these to the likes of the Etymotic HF2 which sounded almost too clinical at times. If you are familiar with those earphones, the B150 sound a little warmer to my ear and provided a more enjoyable listen.After using the B150s for a few days, I can see them easily being a single pair of do it all earphones for pretty much all types of music provided the source is of good quality. The one real caveat though is for those who consider themselves a bass head; these earphones just will not work for you even though they really let you hear the texture of the bass. Likewise, if you like lazy, warm sounding vocals then you may find these not quite to your taste but if you want to be drawn into every word, I urge you to give these a try.I have to say, these are very comfortable to wear and the selection of tips on offer contribute to this as well as help isolate you from outside sounds. These don't seem to isolate quite as well as the Etymotic's but choose the right tip an get a good seal and you will really get the best out of these earphones. Although these are not billed specifically as a sports earphone, they sit very securely in the ear, even before you place the shaped cable up over the ears for added security. I found these great for use in the gym as they stayed securely in place while I was active.These are a step up in money over your average earphone but you are getting a lot with the B150. Brainwavz have put together a great package from the audio and build quality to the supplied case and selection of ear tips. I would love to see a pair of these with an inline remote or even removable cables but even more so, I would love to see what Brainwavz could deliver with a dual or triple armature design. As far as a single balanced armature design does, these do sound great for the more critical listener who still wants the full audio spectrum well represented.Disclaimer. I received these directly from Brainwavz at no cost but I give my honest account of the earphones. I'm not obliged to post a review here but choose to do so in the hope this can give the reader an informed opinion.