Can I Add Bluetooth Speakers to My LG 3KD Soundbar?

Can I Add Bluetooth Speakers to My LG 3KD Soundbar?

To answer the core question: No, you cannot directly add standard third-party Bluetooth speakers to your LG SK3D (often searched as 3KD) soundbar for a surround sound setup. While you can connect a phone to the soundbar via Bluetooth, the soundbar itself acts as a receiver, not a transmitter, meaning it cannot “send” audio to other Bluetooth speakers. To achieve true wireless surround sound, you must use a compatible LG Wireless Rear Speaker Kit (specifically the LG SPK8-S) which uses a dedicated 2.4GHz/5GHz radio frequency rather than standard Bluetooth to eliminate audio lag.

Quick Summary: Key Takeaways

• Direct Compatibility: Standard Bluetooth speakers (like JBL or Bose portables) will not sync with the LG SK3D for multi-channel audio.
• The Hardware Solution: The LG SPK8-S Wireless Rear Speaker Kit is the only official way to add wireless speakers to an LG soundbar in the SK series.
• Latency Issues: Standard Bluetooth has too much “lag” (latency) for home theater use, which is why LG uses a proprietary wireless receiver box.
• Alternative Connection: If your goal is multi-room audio rather than surround sound, you must use LG Sound Sync or a Chromecast Audio adapter.

Understanding the LG Soundbar Ecosystem

In my years of testing home cinema gear, I’ve found that the most common misconception is that Bluetooth is a universal “link” for all speakers. Unfortunately, the LG SK3D and similar models are designed as closed ecosystems. When you ask, “can i add bluetooth speakers to my lg soundbar?” the answer depends on whether you want expansion or replacement.

The LG SK3D is a 2.1 channel system. It comes with a wireless subwoofer that is pre-paired at the factory. This connection uses a private “handshake” protocol. If you try to introduce a generic Bluetooth speaker into this mix, the soundbar’s software won’t recognize it as an output device.

Compatibility Comparison: LG Soundbars & Expansion Kits

How to Add Wireless Speakers to Your LG Soundbar (Step-by-Step)

If you have realized that standard Bluetooth won’t work and you’ve opted for the LG SPK8-S kit, here is the exact process I use to calibrate these systems for clients.

Step 1: Check Your Model Version

Before buying hardware, confirm your model. Users often search for “can i add bluetooth speakers to my lg 3kd soundbar” when they actually own the LG SK3D. Check the sticker on the bottom of the bar. If it says SK3D, SK5, or SJ series, you are in luck—these are generally compatible with LG’s specific rear kits.

Step 2: Connect the Rear Speakers to the Wireless Receiver

The SPK8-S kit consists of a small wireless receiver box and two wired satellite speakers.

1. Run the included speaker wires from the back of the receiver box to each small speaker.


2. Ensure the Positive (+) and Negative (-) terminals match (red to red, black to black).


3. Pro Tip: Use 16-gauge oxygen-free copper wire if you need longer runs than what comes in the box for better signal clarity.

Step 3: Pairing with the LG Soundbar

1. Plug the power cord of the wireless receiver into a wall outlet.
2. The LED light on the front of the receiver will blink green.
3. Turn on your LG SK3D Soundbar.
4. The pairing should happen automatically within 30 seconds. The blinking green light will turn Solid Green.

Step 4: Manual Pairing (If Auto-Link Fails)

If the light stays red or continues blinking:

1. Press the Pairing button on the back of the wireless receiver using a paperclip or pin.


2. Turn off the soundbar, then hold the Volume Down button on the remote until you see “WL RESET” or a similar message on the soundbar display.


3. Turn the soundbar back on.

Why You Can’t Use Generic Bluetooth Speakers for Surround Sound

I often get asked, “Why can’t I just use the Bluetooth speakers I already own?” The answer lies in Digital Signal Processing (DSP) and Latency.

The Latency Gap

Bluetooth was designed for 1-to-1 data transfer (like a phone to a headset). In a home theater, the audio must be perfectly synced with the video. Standard Bluetooth has a delay of roughly 100 to 200 milliseconds. While this is fine for music, it creates a “reverb” or “echo” effect if used alongside a soundbar, and the actors’ voices won’t match their lips.

Channel Routing

An LG Soundbar decodes Dolby Digital or DTS signals. It splits the signal into Left, Right, Center, and Subwoofer channels. To add wireless speakers to lg sound bar setups, the bar needs to “extract” the Rear Left and Rear Right channels and transmit them. Most budget soundbars simply do not have the hardware transmitter required to send these specific channels over Bluetooth.

Alternatives to Adding Physical Speakers

If you find that the SPK8-S kit is out of stock or too expensive, there are a few “hacks” I’ve used in the past, though they come with caveats.

Using LG Sound Sync

If you have an LG TV, you can use LG Sound Sync. This allows the TV to output audio to two different Bluetooth devices simultaneously (on newer LG OLED or NanoCell models).

• The Workflow: You connect the soundbar to the TV via Optical/HDMI, and then pair a separate Bluetooth speaker to the TV’s “Bluetooth Surround” menu.


• The Catch: This is only available on 2020+ TV models and often results in the rear speakers being slightly out of sync with the soundbar.

Third-Party Bluetooth Transmitters

You could technically plug a Bluetooth Transmitter into the 3.5mm “Aux Out” or “Optical Out” of your TV (using a splitter).

• Process: Split the TV’s optical signal. Send one to the LG Soundbar and one to a Bluetooth Transmitter. Pair your Bluetooth speakers to that transmitter.


• Warning: I generally advise against this for LG SK3D users because managing two different volume controls is a nightmare for daily use.

Expert Advice for Optimizing Your LG Soundbar Audio

Based on my experience setting up dozens of these units, follow these tips to get the most out of your LG Soundbar Bluetooth connection:

1. Placement is Key: Place your wireless receiver box in a direct line of sight of the soundbar if possible. 2.4GHz signals from Wi-Fi routers can interfere with the connection, causing the rear speakers to “pop” or “crackle.”
2. Update Firmware: Use the LG Sound Bar app (available on iOS and Android) to check for firmware updates. These updates often improve the stability of the wireless rear speaker connection.
3. Adjust Rear Levels: By default, rear speakers are often too quiet. Use the “Level” button on your LG remote to increase the Rear (R) volume to +3 or +4 for a more immersive experience.
4. Use “Movie” Mode: When you add wireless speakers to an lg soundbar, ensure the soundbar is in Movie or ASC (Adaptive Sound Control) mode. This forces the processor to upmix 2.0 channel content into the rear speakers.

Frequently Asked Questions

Can I add any brand of wireless speakers to my LG soundbar?

No. You generally cannot mix and match brands for surround sound. An LG soundbar requires an LG-branded wireless kit (like the SPK8-S) because they use a specific frequency and proprietary pairing protocol that Sony, Samsung, or Bose speakers cannot decode.

Is the LG SK3D Bluetooth or Wi-Fi?

The LG SK3D features Bluetooth for streaming music from your phone and LG Sound Sync for connecting to LG TVs wirelessly. However, it does not have built-in Wi-Fi for Google Cast or AirPlay. Any “wireless” expansion must be done via the dedicated 5.8GHz receiver kit.

How do I put my LG soundbar in Bluetooth pairing mode?

Press the F (Function) button on the soundbar or the remote until the display reads BT. Once “BT” starts flashing, open your phone’s Bluetooth settings and select the soundbar (e.g., “LG SK3D”). It will stop flashing and stay solid once paired.

Does the LG SPK8-S work with all LG soundbars?

No, it is specifically designed for the SK, SN, and SP series. Always check the manual for your specific soundbar to ensure it lists “Wireless Rear Speaker Ready” before purchasing the kit.

Can I use a Bluetooth transmitter to add speakers?

You can, but I don’t recommend it for home theater. The audio latency will create a distracting echo between the soundbar and the Bluetooth speakers, making dialogue difficult to understand.