Harman Kardon harman/kardon HKOS4BLKEU Onyx Studio 4 Portable Bluetooth Speaker -, BEST SPEAKER EVER!

They are very good but could be louder. Very easy to use and good bluetooth signal range.

It’s not the most portable but it is the best sounding speaker under £250 by a wide margin. You simply don’t get decent bass from small units which the hk delivers in droves along with treble that has none of the harshness small units have. I now have two of these (you can daisy chain as many as you want) and you can play in stereo or duplication mode using the hk app. Two sound awesome and for parties the volume and quality is well worth the expense,.

Highly recommend if you want a decent priced quality speaker. I used to own hk2&3 but i upgraded. Only slight minor differences between them all but this one has a new design and better battery.

Key specs for harman/kardon HKOS4BLKEU Onyx Studio 4 Portable Bluetooth Speaker – Black:

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  • Stream music wirelessly via Bluetooth to enjoy room-filling sound. Connect up to 2 smart devices at the same time and take turns playing music.
  • The rechargeable battery supports up to 8 hours of playtime
  • Amplify your listening experience by wirelessly connecting more than 100 HK Connect+ enabled speakers
  • Built-in Microphone Conferencing System
  • Access Siri or Google Now from the speaker with a simple button press. This can be easily configured via the HK Connect App.

Comments from buyers

“No better speaker under £250
, Superb, ideal for Bassy music

Everything l expected and wanted, couldn’t be more happy.

Pros -very bassy, makes modern music (e. G post malone, drake etc) sound amazing. Can still provide a clear sound for less bassy genres; i’ve recently been listening to some ub40 and it sounds fantastic on the hkbattery life is good, will last a night of playing music quite loud, ideal for party scenarios. If you were to buy two, you can link together using an app, which could turn your house into a small nightclub. Cons -can provide too much bass on songs that wouldn’t usually have bass. Quite large but produces sound of a much bigger speaker.

Brough it on holiday and it was a very useful tool to listen music to whilst by the pool. The only problem was the i didnt think the battery life was long enough as it only lasted a couple of hours apart from that the sound was good.

Wont replace a larger home stereo but handy for carrying around.

Love it, delivered on time , new condition and good quality.

Bought this as a present for my mum for christmas. Lovely bass and excellent warm tone from it.

This is the most amazing bluetooth speaker ive ever came across the bass is immense the sound quality ia as sharp as diamonds it easily fills a big hall with amazing sound,quality and range not to mention the sleek elegant design and smooth sift rubber and plastic textures.

Big harmon kardon fan, and have 2 onyx mini’s that i pair together which sound great. Thought i’d give the bigger version a go. The bass shakes the room but doesn’t get to much. All the music i’ve thrown at it so far has been beautiful to listen too. Thinking i may buy another to pair them together for a great sound experience.

Its by far the best i have owned or heard. It smokes many others if not everything in its price range. Headphone clarity and does not sound compressed or artificially enhanced. Just buy it and you will not be sending it back.

Great sound, which can really crank for such a small speaker.

It’s absolutely stunning, good sound quality for the size and cost.

Sleek design and powerful soundnot too heavy and easy to carry around. Just nice to complete my humble living room.

I am normally the man that reads but doesn’t leave reviews but after having and returning the sonos play 3 for low bass and high volume pulsing i was not sure what to expect from something substantially cheaperwow . Heavy on the bass without being overpowering or distorting which is my preferencewill be buying several more.

Bought as a gift for my son who is delighted with it. Excellent sound quality and lasts a long time even at high volume between battery charges.

Love this speaker so much its unreal, the quality of sound is amazing and the range of volumes is the best out of any speaker i’ve ever owned. Stays charged for a good while aswell, can’t fault it.

Sounds great for my room is perfect.

Had the onyx 3 and bought the onyx 4 for parents. Highly recommended by brother lives in indonesia.

The sound quality is excellent. I have two linked together given that extra sound quality.

Review Date
Reviewed Item
harman/kardon HKOS4BLKEU Onyx Studio 4 Portable Bluetooth Speaker - Black
4.3 of 5 stars, based on 29 reviews