The three ways to connect a soundbar to a projector

A projector and soundbar connect through the same audio cables and wireless protocols as any other devices—the projector sends audio to the soundbar, and the soundbar plays it. The three practical routes are HDMI (the most common), optical cable (older projectors), or Bluetooth (wireless, but less reliable). Which one works depends on what ports your projector has and whether your soundbar supports that connection type.

Most modern projectors have at least one HDMI port and many have an optical audio output. Older projectors may have only 3.5mm headphone jacks or RCA connectors. Your soundbar manual will list which inputs it accepts—check that first, because if your projector and soundbar share no common connection type, you will need an adapter or a different approach.

Key Takeaways

  • HDMI is the simplest connection because it carries both video and audio in one cable, and most modern projectors and soundbars support it.
  • Optical cable works with older projectors and is more stable than Bluetooth, but requires both devices to have an optical port.
  • Bluetooth is wireless but can drop the connection or introduce delay between picture and sound, so it is best as a backup option.
  • Check your projector's manual or the ports on the back to see what audio outputs it has before you buy cables or adapters.
  • If your projector has no audio output at all, you may need to run audio from your media source (streaming device, laptop, cable box) directly to the soundbar instead.

Connecting via HDMI

HDMI is the easiest route if both devices support it. Run an HDMI cable from your media source (Blu-ray player, streaming device, laptop, cable box) to the projector's HDMI input. Then run a second HDMI cable from the projector's HDMI output (if it has one) to the soundbar's HDMI input. The projector passes the audio signal through to the soundbar automatically—no settings to change.

Many projectors have only HDMI inputs, not outputs. If yours is one of them, you cannot use HDMI to send audio to the soundbar. In that case, move to the optical cable method below, or run audio directly from your media source to the soundbar using a different cable type.

Some soundbars have an HDMI input labeled "HDMI ARC" or "eARC". This is a special port that can receive both video and audio from a single cable. If your projector has an HDMI output and your soundbar has HDMI ARC, connect them directly—this is the cleanest setup. The projector will automatically send audio to the soundbar without you having to switch inputs.

Connecting via optical cable

An optical cable (also called a Toslink cable or digital optical cable) carries audio only, not video. It is the standard for older projectors and works reliably over longer distances than HDMI. Run the optical cable from the projector's optical audio output to the soundbar's optical input. Both devices should recognize the connection automatically.

Optical cables are inexpensive and widely available at electronics retailers. They look like thin black or clear tubes with small square connectors on each end. Make sure you buy the right type—there are different sizes, though the standard size fits almost all projectors and soundbars.

If your projector has an optical output but your soundbar does not have an optical input, you will need an adapter. A digital-to-analog converter can change the optical signal to a 3.5mm headphone jack or RCA connectors, which older soundbars may accept. These adapters cost $15 to $40 and are available online or at electronics stores.

Connecting via Bluetooth

Bluetooth is wireless and requires no cables, but it is the least reliable of the three methods. Audio can drop if the soundbar moves out of range or if other wireless devices interfere. Bluetooth also sometimes introduces a slight delay between the picture on screen and the sound from the speaker, which is noticeable during dialogue or action scenes.

To connect via Bluetooth, put the soundbar in pairing mode (usually by holding a button on the remote or the soundbar itself for a few seconds). Then go to your projector's settings menu, find the Bluetooth section, and select the soundbar from the list of available devices. Once paired, the projector will connect to the soundbar automatically each time you turn both on.

Bluetooth works best as a backup if your projector has no HDMI output and no optical port. If you have a choice between Bluetooth and optical or HDMI, use the wired option instead.

When your projector has no audio output

Some projectors—particularly older or budget models—have no audio output at all. They are designed to work with a separate audio system from the start. If this is your situation, do not try to extract audio from the projector. Instead, run audio directly from your media source to the soundbar.

For example, if you are streaming from a Roku, Apple TV, or Fire Stick, connect that device to the soundbar using HDMI, optical, or Bluetooth. The projector receives only the video signal from the media device, and the soundbar receives the audio. This setup actually works better than trying to route audio through the projector, because you avoid an extra step and potential signal loss.

If your media source is a cable box or satellite receiver, the same principle applies: connect the box directly to both the projector (for video) and the soundbar (for audio). Your projector manual will show you which video input to use.

Checking your projector's ports and settings

Before you buy any cables, look at the back of your projector and identify what ports it has. Most projectors have HDMI inputs clearly labeled. Some also have an optical audio output, a 3.5mm headphone jack, or RCA connectors. Your projector's manual will list all ports and explain what each one does.

Once you have connected the cable, check your projector's settings menu. Look for an audio output or sound settings section. Make sure the projector is set to send audio to the external device (soundbar) rather than to any built-in speaker. The exact menu path varies by projector brand, but it is usually under Settings > Audio or Sound > Output Device.

If the soundbar is not receiving audio after you have connected it, go back to this menu and confirm the output is enabled. Some projectors default to internal speakers and require you to manually switch to external audio.

Troubleshooting no sound from the soundbar

If you have connected the soundbar but hear nothing, check these things in order. First, make sure the soundbar is powered on and the volume is not muted or set to zero. Look at the soundbar's display or indicator light—it should show that it is receiving a signal from the projector.

Second, confirm the projector's audio output setting is switched to the external device. Go back into the projector's settings menu and verify that audio is not being sent to an internal speaker instead. If the projector has multiple audio outputs, make sure you are using the one you connected the soundbar to.

Third, check the cable itself. Unplug it from both ends and plug it back in firmly. If you are using HDMI, try a different HDMI cable if you have one—some cables are defective or worn out. If you are using optical, hold the cable up to a light and make sure the connector is clean and not cracked.

If the soundbar still has no sound, try connecting it to a different device (a phone, laptop, or media player) to confirm the soundbar itself works. If it does, the problem is between the projector and soundbar, and you may need to consult your projector's manual or contact the manufacturer.

Frequently Asked Questions

Can I use a regular HDMI cable to connect a soundbar to a projector?

Yes, if both devices have HDMI ports. A standard HDMI cable works fine. If your projector has an HDMI output and your soundbar has an HDMI input, they will work together without any special cable or settings.

What if my soundbar and projector have no ports in common?

You will need an adapter. For example, if the projector has only optical output and the soundbar has only 3.5mm input, a digital-to-analog converter bridges the gap. Check the specifications of both devices, then search for an adapter that matches those ports. Electronics retailers and online marketplaces carry adapters for most combinations.

Does the soundbar have to be the same brand as the projector?

No. Any soundbar will work with any projector as long as they share a compatible connection type. Brand does not matter—only the ports and cables do.

Is there a delay between the picture and sound when using Bluetooth?

Sometimes. Bluetooth can introduce a slight delay, which is noticeable during movies or shows with dialogue. HDMI and optical cables do not have this problem. If you watch a lot of video content, use a wired connection instead of Bluetooth.

Can I connect multiple soundbars to one projector?

Not through a single audio output. A projector's audio output sends to one device at a time. If you want sound in multiple rooms, you would need a separate audio system for each room, or an audio splitter (which divides one audio signal into two or more outputs). An audio splitter is inexpensive but may reduce sound quality slightly.