If you are asking what cable do I need for a soundbar, inspect the labels on both devices before buying anything. Use HDMI when both have matching ARC or eARC ports. Otherwise use optical when both have optical ports. Use 3.5mm or RCA only when both sides provide compatible analog audio connections.

The 60-second port check

  1. Find the TV’s audio-output panel and the soundbar’s inputs.
  2. Look first for HDMI ports labeled ARC or eARC on the TV and HDMI OUT (TV-ARC/eARC) on the soundbar.
  3. If those are missing, look for Optical/Digital Audio Out on the TV and Optical In on the soundbar.
  4. If neither digital match exists, identify headphone, 3.5mm Audio Out, or red/white RCA outputs.
  5. Measure the route with slack; avoid sharp bends and tension.

Cable selection diagram matching TV and soundbar HDMI optical and analog ports
The connector shape is not enough—match the port label and output direction on both devices.

Choose HDMI for ARC or eARC

For ARC, a sound High Speed HDMI cable is generally the practical choice. For eARC, certified Premium High Speed or Ultra High Speed HDMI cables are designed to support the feature; choose based on the total video capabilities of any devices routed through the soundbar. Certification matters more than luxury branding or exaggerated claims.

Connect the TV’s labeled ARC/eARC input to the soundbar’s labeled HDMI output—not a regular HDMI input. Then enable CEC and select the external audio system. See our HDMI ARC connection guide.

Choose optical when HDMI audio return is unavailable

A Toslink optical cable carries digital audio and is easy to recognize by its small squared connector. Remove protective caps and do not kink it. Optical is a good choice for older TVs, simpler soundbars, or persistent HDMI control problems. Follow the full optical soundbar setup.

Choose analog only for matching audio outputs

A 3.5mm stereo cable works from a TV headphone/audio-out jack to a soundbar AUX input. A 3.5mm-to-RCA cable can bridge a headphone output to red/white analog inputs. Do not connect a TV’s red/white input sockets; inputs cannot feed the soundbar.

Avoid common buying mistakes

  • Do not assume every HDMI port supports ARC.
  • Do not buy an optical cable when only one device has optical.
  • Do not confuse coaxial digital audio with optical Toslink.
  • Do not pay for extra HDMI video bandwidth unless your signal path needs it.
  • Do not use adapters until you know whether conversion must be digital-to-analog or analog-to-digital.

After matching ports, compare a certified HDMI cable for eARC or a Toslink optical cable. For a broader comparison, read how to connect a soundbar to a TV.

Frequently asked questions

Does a soundbar include the cable?

Some do and some do not. Check the box contents; the included type may not be the best connection your TV supports.

Do expensive HDMI cables improve sound?

A compliant cable either carries the required digital signal reliably or it does not. Choose certified capability, suitable length, and solid construction rather than extravagant claims.

Can USB connect a TV to a soundbar?

Usually no. USB ports commonly provide service, updates, or media playback rather than the TV’s live audio output.

Still need help choosing a connection or troubleshooting your setup? Try the AAHE Gadget Wiz for guided help with your TV, soundbar, cables, and settings.

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