In this guide
A complete home theater setup needs HDMI cables for video, RCA or XLR cables for audio, oxygen-free copper speaker wire, and power cords — the exact mix depends on your components and audio configuration.
- You use HDMI for video and matching audio connectors for your receiver
- Speaker wire gauge matches your system’s power requirements
- Cable lengths are planned in advance with no excess strain
- Speaker and power cables run in separate conduits
- You use optical cables on a 7.1 system — optical caps out at 5.1 channels
- Speaker wire shares a conduit with power cables
- You use standard copper wire instead of oxygen-free copper for high-end speakers
- Your cable quality is below the weakest component in the chain
HDMI: Your Video Cable
HDMI is the standard for connecting your TV, projector, Blu-ray player, and AV receiver. A single HDMI cable carries both video and audio, making it the simplest choice for most connections. Choose cable lengths that reach your components comfortably — too short causes strain on ports, too long creates clutter.
If you’re connecting a laptop or newer device with USB-C, check out whether USB-C can connect to HDMI before buying adapters.
Audio Cables: RCA vs XLR
Once you go beyond basic HDMI audio, you’ll need dedicated audio cables for subwoofers, amplifiers, or multi-channel setups.
- RCA cables — one channel per connector. You need two for stereo, more for surround sound. These work for subwoofers and most consumer AV equipment.
- XLR cables — also one channel per cable, but balanced. Better at rejecting electrical interference over longer runs. Not all home theater gear has XLR ports.
Your audio quality is only as good as the weakest cable in the chain, so don’t pair high-end components with cheap connectors. For a deeper look at audio and video cable compatibility, see our full guide.
Speaker Wire
Speaker wire connects your AV receiver to each speaker. For high-end systems, use oxygen-free copper (OFC) wire — standard copper introduces more resistance and signal loss. Gauge matters too: thicker wire (lower AWG number) suits longer runs and higher-powered speakers.
Never run speaker wire in the same conduit as power cables. The interference will degrade your audio signal noticeably.
Quick Reference: Common Home Theater Connections
| Setup | Works? | Need | Note |
|---|---|---|---|
| TV to AV receiver | Yes | HDMI | Use HDMI ARC/eARC port if available |
| Receiver to subwoofer | Yes | RCA (mono) | Single cable is enough |
| 7.1 surround sound | Yes | HDMI or multi-RCA | Optical cable will not carry 7.1 |
| Receiver to speakers | Yes | OFC speaker wire | Match gauge to run length and power |
| USB-C source to TV | Yes | USB-C to HDMI cable | Check device supports video out |
Planning Tips
- Map your cable routes before installation to get accurate lengths
- Leave a dedicated power socket near the subwoofer position
- Label each cable during install — it saves time when troubleshooting
- Check your receiver’s input/output ports before buying audio cables
For more on display connectivity, the Crutchfield home theater cable guide is a reliable reference for matching cables to specific receiver models.
Bottom line: Most home theater setups need HDMI for video, RCA for subwoofers and audio routing, oxygen-free copper speaker wire for each speaker, and separate power cords. Plan your cable runs in advance, keep speaker wire away from power cables, and avoid optical connections if you want full 7.1 surround sound.