Harman Kardon Onyx Studio 4 (HKOS4BLKBSG)
Harman Kardon Onyx Studio 4 Wireless Bluetooth Speaker User Manual
Model: Onyx Studio 4 (HKOS4BLKBSG) | Brand: Harman Kardon
1. Introduction
The Harman Kardon Onyx Studio 4 is a full-featured, portable Bluetooth speaker designed to deliver high-quality audio. It supports connections for up to two smart devices simultaneously and features Harman Kardon Connect+ technology, allowing connection with over 100 compatible speakers. The speaker also includes a built-in microphone with VoiceLogic echo and noise cancellation for clear conference calls.
Key Features:
- Wireless connection to over 100 HK Connect+ enabled speakers for an amplified listening experience.
- Rechargeable battery providing up to 8 hours of playtime.
- Bluetooth wireless streaming for room-filling sound, with support for connecting up to two smart devices concurrently.
- Integrated microphone with VoiceLogic echo and noise cancellation for crystal-clear conferencing.
- Access to Siri or Google Now via a simple button press, configurable through the HK Connect app.
- Premium fabric and iconic design for aesthetic appeal.
- Signal to noise ratio: 80dB A-weighted.

Figure 1: Front view of the Harman Kardon Onyx Studio 4 speaker.
2. Setup
2.1 Initial Charging
Before first use, fully charge the Onyx Studio 4 speaker. Connect the power adapter to the speaker's power input and then to a wall outlet. A full charge takes approximately 8 hours. The LED indicator will show charging status.
2.2 Bluetooth Pairing
- Power on the Onyx Studio 4 speaker by pressing the Power button.
- The Bluetooth indicator will flash blue, indicating it is in pairing mode.
- On your smart device (smartphone, tablet, etc.), enable Bluetooth and search for available devices.
- Select "Harman Kardon Onyx Studio 4" from the list of devices.
- Once connected, the Bluetooth indicator will glow solid blue. You can connect up to two smart devices simultaneously.
2.3 HK Connect+ Setup
To connect multiple Harman Kardon Connect+ enabled speakers:
- Ensure all speakers are powered on and within range.
- Press the Connect+ button on the first speaker (the primary speaker).
- Within 30 seconds, press the Connect+ button on all other speakers you wish to connect.
- The speakers will automatically connect and play audio in sync.

Figure 2: Side view illustrating the control panel and connectivity options.
3. Operating Instructions
3.1 Power On/Off
Press the Power button located on the speaker to turn it on or off.
3.2 Music Playback
Once connected via Bluetooth, you can control music playback directly from your paired smart device. The speaker's volume buttons can also adjust the output volume.
3.3 Voice Assistant Integration
To access Siri or Google Now, ensure your speaker is connected to your smart device. Use the HK Connect app to configure this feature. Once configured, a simple button press on the speaker will activate your device's voice assistant.
3.4 Hands-Free Calling
The built-in microphone allows for crystal-clear conference calls. When a call comes in, the music will pause. Press the Phone button to answer or end a call. The VoiceLogic echo and noise cancellation technology enhances call clarity.

Figure 3: Rear view showing the power input and auxiliary audio port.
4. Maintenance
4.1 Cleaning
Wipe the speaker with a soft, dry cloth. Do not use abrasive cleaners or solvents. Ensure no liquids enter the speaker's openings.
4.2 Battery Care
To prolong battery life, avoid fully discharging the battery frequently. Recharge the speaker regularly, even if not in constant use. Store the speaker in a cool, dry place when not in use for extended periods.
4.3 Water Resistance
Important: The Harman Kardon Onyx Studio 4 is not waterproof. Avoid exposing the speaker to water, rain, or excessive moisture to prevent damage.
5. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Speaker does not power on. | Battery is depleted or power adapter is not connected. | Connect the power adapter and allow the speaker to charge. Ensure the power outlet is functional. |
| Cannot connect via Bluetooth. | Speaker is not in pairing mode, or device's Bluetooth is off. | Ensure the speaker's Bluetooth indicator is flashing. Turn off and on your device's Bluetooth. Forget the speaker from your device's Bluetooth list and re-pair. |
| No sound or low volume. | Volume on speaker or device is too low, or incorrect audio source selected. | Increase volume on both the speaker and your connected device. Ensure the correct audio output is selected on your device. |
| HK Connect+ not working. | Speakers are not compatible or not within range. | Ensure all speakers are HK Connect+ enabled. Place speakers closer together. Repeat the Connect+ pairing process. |
6. Specifications
| Feature | Detail |
|---|---|
| Model Name | Onyx Studio 4 |
| Item Model Number | HKOS4BLKBSG |
| Brand | Harman Kardon |
| Speaker Type | Multi Room |
| Special Feature | Built In Microphone |
| Recommended Uses | For Music Players |
| Connectivity Technology | Bluetooth |
| Wireless Communication Technology | Bluetooth |
| Control Method | App |
| Power Source | Battery Powered |
| Battery Life | 8 Hours |
| Charging Time | 8 Hours |
| Speaker Maximum Output Power | 60 Watts |
| Product Dimensions | 12.5"D x 13"W x 8.5"H |
| Item Weight | 7.2 Pounds |
| Is Waterproof | FALSE |
| UPC | 028292280764 |
7. Warranty and Support
For detailed warranty information and customer support, please refer to the official Harman Kardon website or the documentation included with your product. You can also download the full user manual in PDF format:
For further assistance, contact Harman Kardon customer service.
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