Harman Kardon Onyx Studio 4 Wireless Bluetooth Speaker Review

Harman Kardon Onyx Studio 4 is one of the best sounding Bluetooth speakers under $150 on the market.

There’s a bunch of reasons to buy Onyx Studio 4 – rich, powerful, and balanced sound, amazing design (one of the most elegant speakers on the market), Bluetooth connectivity, great connection quality, multi-host (connect up to 2 phones simultaneously) and daisy chaining features (connect up to 100 speakers together), built-in battery, built-in microphone, HK Connect app.

Unfortunately, it’s not all that great. Most of our complaints are related to battery durability (this beautiful speaker needs some stronger battery) and build quality. This speaker is made of premium materials and looks/feels expensive but it’s not rugged enough and it’s not the best choice if you need an outdoor Bluetooth speaker. You can use it outdoors since it’s portable/battery-operated but it’s not rugged enough. If you need something rugged and waterproof, you should look elsewhere.

Harman Kardon Onyx Studio 4 Wireless Bluetooth Speaker

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  • Great sound quality, very balanced sound
  • Elegant design
  • Portable
  • Can be paired with up to 100 Onyx 4 speakers
  • Speakerphone feature


  • Not waterproof, not rugged
  • Weak battery (short playtime)


If you are looking for the most elegant and best sounding portable Bluetooth speaker under $150, you won’t find a better choice than Onyx Studio 4.

Official video – Harman Kardon Onyx Studio 4

What’s in the box?

Harman Kardon Onyx Studio 4 comes in a premium-looking box along with a charging adapter (2 wall adapters for EU and US market), user manual, and 1-year warranty. Hard carrying case is not included and you have to buy it separately. The speaker has one 3.5mm input but the audio cable is also not included.


Harman Kardon Onyx Studio 4 Specifications 
Diameter11 inches
Depth6.3 inches (including 2 undetachable feet)
Woofers75mm x2
Tweeters20mm x2
Passive radiatorYes, x1
ENCLOSURE TYPEPassive radiator
Typeli-ion, rechargeable
PlaytimeUp to 7 hours (at 50% volume)
Recharge time5 hours
CONNECTIONSBluetooth, AUX input
Supported Bluetooth profilesA2DP, HSP, AVRCP
Multi-hostYes (2 devices connected simultaneously to the speaker)
Bluetooth rangeUp to 33ft (without obstacles)
Daisy chainingYes, up to 100 HK speakers
Frequency response50Hz-20,000kHz
Peak output power60W (plugged in), 30W (on battery)
ADDITIONAL FEATURESHK Connect + app, Siri or Google Now integration


Harman Kardon has truly perfected the designing process. All the Bluetooth speakers made by this famous manufacturer look incredibly elegant and Onyx Studio 4 is the perfect example. This speaker comes in three colors (black, blue, and white) and we couldn’t decide which one is the most beautiful. They all look very attractive.

Onyx Studio 4 in three colors

Harman Kardon Onyx Studio 4 is available in three colors

The whole front panel is covered with a fabric grille that protects the drivers. There’s a simple harman/kardon logo on the grille.

Onyx Studio 4 Front panel

Picture 1 – Front panel (with the fabric grille)

The grille is removable (but it doesn’t come off easily). You can use the speaker with or without the grille, depending on your taste. The grille has a protective purpose so you might want to leave it on, especially if you are going to use the speaker outdoors.

Onyx Studio 4 without the fabric grille

Picture 2 – Front panel (without the fabric grille)

On the rear panel, you will see the carrying handle at the top, the bass reflex port in the middle, and input ports at the bottom. There are also two undetachable feet that provide stability.

Rear panel

Picture 3 – Rear panel

Studio 4 features 3 input ports – micro USB port (for service purposes and firmware upgrade), AUX (3.5mm) input, and DC input.

Rear panel inputs

Picture 4 – Rear panel inputs

All the control buttons are on the top, along the rim. There are 6 nice-looking backlit buttons – Bluetooth, Connect+ button, volume buttons (+ and -), handsfree button (you can use it to answer/end calls, play/pause the music, or activate Siri/Google Now), and power button.

Control panel

Picture 5 – Control panel


Onyx Studio 4 is made of premium materials and you can really fell that by holding the speaker. It’s kind of heavy and it looks quite sturdy. It is completely made of plastic but it’s very thick and very hard plastic. Still, the speaker is not waterproof (it’s not IPX certified) and it’s not shockproof so it’s not the best speaker for outdoor use. It’s more of a desktop speaker.  

Studio 4 is very much portable since it has a built-in battery and it’s not too heavy to carry around. So, if you want to use it outdoors, you can. But, be warned that it’s not very rugged and that the battery inside the speaker has the capacity of 3,000mAh. The capacity is not bad but it’s not great either, especially when there are 2 woofers and 2 tweeters inside the speaker that need to be driven.

Onyx Studio 4 features Bluetooth 4.2 with a 33ft Bluetooth range. You can pair two Bluetooth-enabled devices (phones/tablets/PCs) at the same time with one Onyx Studio 4 (multi-host feature) and the speaker can memorize up to 8 devices. The speaker lacks NFC quick pairing feature so if you are an Android user, you will have to go through the standard pairing process. Studio 4 also has one AUX input so you can connect non-Bluetooth devices to the speaker.

The speaker has a built-in microphone (speakerphone feature) with some nice software add-ons (voicelogic + echo/noise canceling).

Onyx Studio 4 also features voice-assistant support. You can access Google Now and Siri by long pressing the handsfree/call button. In order to configure/activate this feature, you have to use the HK Connect app which is another nice feature. The speaker can be controlled with this app but most of the users aren’t so happy with this app. We will discuss some app-related issues in the ‘’Performance’’ section.

HK Connect app

Picture 6 – HK Connect app (download it from Google Play or App Store)


We were mostly happy with this speaker’s performance but there are also some issues that need to be mentioned.

The good things first.

We can’t complain about the Bluetooth connection and sound quality (sound quality will be discussed in the next section).

The Bluetooth connection works without issues – we haven’t experienced any signal loss or cutout within the advertised range. In fact, if you are using some newer phone (like iPhone X) the range will be even larger (up to 50+ft without obstacles). Pairing is simple and it’s the same for Android and iPhone users (no NFC quick pairing feature for Android users). In order to initiate pairing, you will have to press the Bluetooth button (pairing doesn’t start automatically). Multi-host is also a nice feature and works without issues.

Daisy chaining can be problematic, especially if you want your speakers to play the music in stereo mode (there are two modes – stereo and party). In order to do that, you have to use the app. Many people had issues with this feature since it’s not enough to press the Connect+ button on each speaker. Let’s assume that you have 2 Onyx Studio 4 speakers and that you want to pair them together and play the music in stereo mode. Follow these simple steps:

Step 1 – Turn on the first speaker, initiate pairing (press the Bluetooth button) and pair it with your phone. You can stream your music to the first speaker now.

Step 2 – Turn on the other speaker (don’t press the Bluetooth button).

Step 3 – Press the Connect+ button on the first speaker and then press the same button on the other speaker.

Step 4 – Both speakers will play the music in party mode (default settings)

Step 5 – In order to make them play the music in stereo mode, you will have to download and install the HK Connect App.

Step 6 – Open the app and select stereo mode. The speakers should start playing in stereo mode (left and right channels).

The app is poorly rated on Google Play and App Store and users don’t really like it. It’s too basic. You can (have to) use it to select the stereo or party mode or to program the handsfree/call button. You can’t play with the sound signature and adjust the EQ settings through the app.

The battery is not that small (3,000mAh) but there are four drivers inside (+ passive bass radiator) so the playtime is not really great. Harman Kardon claims that you can get 8 hours of playtime but you can actually get less than 7 at 50% volume (less than 4 hours at 100%). This great sounding speaker needs some larger battery.

The built-in mic works flawlessly even if there’s too much noise around you. Kudos to Harman Kardon for that.  

Sound Quality

The sound quality is the most noticeable feature of this speaker. You can hardly get more balanced sound for less than $150.

The bass response is impressive for the speaker of this size. The low frequencies are present and punchy even at low volumes (maybe even slightly boosted).

Mids are dynamic and all the voices are perfectly clear. Lower mid frequencies don’t get overpowered by the bass until you increase the volume above 80%. The distortion becomes noticeable at 90% volume but it’s not too distracting.  

The high frequencies are absolutely sparkling.

All in all, the sound is balanced and without too much bass boost.

The soundstage is surprisingly wide for the speaker of this size.

Stereo separation practically doesn’t exist since all the drivers are close to each other but you can get much better separation if you pair two speakers and play the music in stereo mode.

Onyx Studio 4 can be loud but it’s not louder than some competitors within the same price range (like UE MEGABOOM or Marshal Kilburn).

The Competition

Owlee AviaryOwlee Aviary

Owlee Aviary is similar to Onyx Studio 4 but there are some important differences. Aviary is cheaper and it delivers less impressive and quieter sound. If the sound quality is your priority, Studio 4 is a clear winner. They both have speakerphone feature and deliver similar playtime. Aviary features NFC while Studio 4 doesn’t. Owlee Aviary doesn’t support daisy chaining (can’t be paired with another Aviary speaker) while you can pair up to 100 Onyx Studio 4 speakers together. There’s no app for Owlee Aviary while there’s the HK Connect app for Onyx Studio 4.

iClever BoostSoundiClever BoostSound

If you need something really cheap that looks similar to Onyx Studio 4, iClever BoostSound might be the best thing for you. You should be aware that iClever BoostSound could never deliver the same sound quality but it’s actually not that bad. iClever looks and feels cheaper (which is not a surprise). The bass is more boosted than on Onyx Studio 4 and. iClever’s playtime is slightly longer (12 hours compared to 7 hours). iClever features micro SD card slot while Studio 4 doesn’t. On the other hand, Studio 4 comes with the app and can be paired with up to 100 Onyx Studio 4 speakers. They both have built-in mics.

Harman Kardon Omni 10Harman Kardon Omni 10

Omni 10 is another example of Harman Kardon’s recognizable design. Omni 10 is as stylish as Onyx Studio 4 but it’s inferior in all the other aspects. The sound is rich and balanced, the bass is maybe even punchier than on Studio 4 but the overall sound quality of Onyx Studio 4 is better. Studio 4 features more powerful battery (longer playtime), it comes with the app, it has a greater Bluetooth range and more stable connection, and it can be paired with up to 100 other Studio 4 speakers. Omni 10 is significantly cheaper.

Comparison Table

SpeakerBattery (50% vol.)Power
Onyx Studio 4Up to 7 hours60W/30W on battery
Owlee AviaryUp to 9 hours20W
iClever BoostSoundUp to 12 hours20W
Harman Kardon Omni 10Up to 5 hours60W/30W on battery

Final Thoughts

Onyx Studio 4 is, without any doubt, one of the best sounding speakers under $150 and if you don’t care about those drawbacks we’ve talked about (not waterproof, splash proof, shockproof, it lacks NFC, and it needs stronger battery), you should definitely try it.

Recommended Reading :

If you want something cheaper but similar to Onyx Studio 4 (at least when it comes to design), you can choose between Owlee Aviary (better option) and iClever BoostSound (worse option). If you want that recognizable Harman Kardon stylish design but you need something cheaper, you can buy HK Omni 10. Still, these speakers are not better than Onyx Studio 4 and if the sound quality and great design are your priorities, Onyx Studio 4 is the best choice.

Transparency Disclosure – AudioReputation.com is a participant in the Amazon Services LLC Associates Program. To put it simply, we have an affiliate relationship with Amazon. In our reviews, you will find links that will redirect you to one of the Amazon’s websites (usually amazon.com). These links are called ‘’affiliate links’’ and they help us fund our work. So, basically, when you click on some link and buy the speaker/headphones/soundbar/home theater system or any other piece of audio equipment, we get a small percentage/commission. You don’t have to pay extra if you click on our links – there are no additional costs.

When we recommend some piece of audio equipment, it’s not because we are under an obligation to do so. It’s because our evaluation and research have shown that certain product deserves to be recommended.

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Hello, my name is James Longman.

I’m a writer and editor at AudioReputation. I disassembled my first portable AM/FM radio when I was only 8. At the age of 11, I burned the circuit board on my old boombox cassette player. I’m not going to explain how but it was reckless and stupid.

Since then, I have become much more careful around radios, boomboxes, and other audio devices (at least, I like to think so) but I have never lost the passion for audio equipment. Throughout 20 years of my professional career, I’ve been working for various audio equipment manufacturers and even started building speakers on my own in my little workshop.

I love the work we do here at AudioReputation. Testing, comparing, and evaluating all kinds of audio devices (speakers, soundbars, headphones, home theater systems, etc.) is something I truly enjoy. I try to be unbiased and give you my honest opinion on every piece of equipment I test. Still, you should take my reviews with a pinch of salt and always be just a little bit skeptical. The fact that I liked some speaker or soundbar doesn’t mean that you are going to love it. If you have the opportunity, you should test it/hear it before buying it.

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