iPhone Screenshots


The HK Connect app works with Harman Kardon Onyx Studio 4. Use the HK Connect app for speaker configuration and software upgrade.

What’s New

Version 1.2

Fixed UI bugs.

Ratings and Reviews

1.5 out of 5
147 Ratings

147 Ratings

Ankhsunaten ,

APP is of NO use at all.

After reading all of the reviews, most negative, I still gave the app a shot. Let me say for starters that I absolutely love my Onyx 4. It’s been amazing since the day that I purchased it. The app is unfortunately another story. I’m a “tech head” and can basically trouble shoot anything and get it to work. But the HK app definitely needs further development. After MULTIPLE strategies to get the app to work, I am still unsuccessful. I have reset the speaker, reset the Bluetooth, reset the phone, and numerous other techniques. The app still has not “found” my speaker and after multiple attempts nothing has worked even though I no issues playing music (which sounds amazing on my Onyx 4). I will always be an HK fan for the hardware, but the app is basically useless. Obviously, some people have gotten it to work and I applaud their accomplishments. But having “some” people find success and the rest get absolute failure is not a good ranking to say the least. I hope the developers address the issue and make this app work for all of their loyal HK owners.

Rcbamm ,

Worked the first time. Second time..

Worked the first time connecting to TWO Onyx 4’s, yet when paired watching movies there was a latency problem. Voices in videos were half a second behind what was being displayed in videos. Second time after a few days the app won’t recognize the speakers even when BOTH are connected to Bluetooth.. Keeps telling me to turn my Bluetooth on and won’t go past that page. However, I still can link both Onyx 4 speakers without the app, which is nice. I noticed with one speaker connected to Apple TV 4 there was no latency. I have yet to further test both speakers. But speakers are great. I’m believing these issues will be addressed with updates. That’s why I’m leaving a review hoping Harmon Kardon will fix these issues.

SoundyQ ,

Definitely does not work

The app does not find the speaker whether it is paired or not. I let the app search for a really longtime after TURNING OFF all my other devices. It kept on searching for almost twenty minutes.
Then, after the first pairing of the speaker to the iPad, the speakers (I have two) NEVER showed up on the Bluetooth scan again.
The speakers sound great when plugged into the device directly, but nope they truly don’t work as Bluetooth. And of course I have no way of knowing if they would work as a system since they don’t show up in the scan or the app!

What a disappointment. I DO NOT want a complicated home sound system in the house and this CONCEPT was a great solution. Alas, it’s just a concept.


Harman International Industries
62.1 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Dutch, French, German, Italian, Japanese, Korean, Portuguese, Russian, Simplified Chinese, Spanish

Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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