Setting up a home theater means linking TV, audio, and sources through the correct HDMI ports, then enabling ARC or eARC for sound to return to the receiver.
Most home theater setups stumble on one detail: the audio return path. The TV, the receiver or soundbar, and every streaming stick, game console, or cable box need to connect so that sound flows both ways through a single HDMI cable. Get the ports matched and the settings enabled, and the whole system falls into place. Get them wrong, and you get silence from the speakers or no picture at all.
For a bedroom-sized setup, the same wiring rules apply, only scaled down. If you are shopping for compact gear that fits a smaller space, our roundup of the best bedroom home theater options walks through tested picks that pair well with the connection steps below.
What Does A Home Theater Setup Actually Need?
A complete home theater centers on three parts: a display, an audio system, and the HDMI connections that tie them together. HDMI ARC (Audio Return Channel) and eARC (enhanced Audio Return Channel) let TV apps and external sources send audio back to the receiver or soundbar through the same cable that carries video to the TV.
ARC and eARC both require the feature on the TV side and the audio side, plus a single HDMI cable between them. Sony’s guidance confirms that ARC uses a single High Speed HDMI cable and removes the need for a separate optical or composite audio cable. The connection handles TV audio sources such as cable, satellite, streaming, and any source device routed through the TV to an AVR or soundbar.
Matching the ports matters more than anything else. The ARC/eARC port on the TV must pair with the ARC/eARC port on the receiver or soundbar. Plugging into a standard HDMI port breaks the audio return path entirely — it is the most common failure point in new setups.
Connecting The TV To The Receiver Or Soundbar
Start with the physical cable. Connect the TV’s HDMI jack compatible with eARC/ARC to the audio system’s HDMI OUT (TV eARC/ARC) jack using the supplied HDMI cable, if one came in the box. A standard High Speed HDMI cable works for ARC; eARC may require a certified Ultra High Speed cable for full bandwidth.
Once the cable is seated, the TV needs to know where to send its audio. Change the TV settings so TV sound outputs through the speaker system rather than the built-in speakers. This settings screen lives under different names by brand — look for “Audio Output,” “Sound Output,” or “Speakers” in the TV menu, and select the external system or the ARC/eARC device.
ARC and eARC often require HDMI-CEC to be enabled. CEC is the control protocol that lets one remote operate multiple devices, and it also underpins the audio return handshake. If CEC is off, audio return or remote control features may fail. Look for “CEC,” “Bravia Sync,” “Anynet+,” or “Simplink” depending on the brand, and turn it on. Sony’s setup guidance for AV receivers walks through the order: enable the TV’s ARC or eARC function first, then on the receiver go to Setup > HDMI Settings > Audio Return Channel and choose eARC or ARC according to what the TV supports.
ARC vs eARC: Which One Should You Use?
Use eARC when both the TV and the audio device support it; use ARC when the TV only supports ARC. Sony states plainly that ARC works when the TV supports ARC, and eARC works when the TV supports eARC. ARC can still work with an eARC-capable unit connected to an ARC TV — the system downshifts to the lower standard.
| Connection Type | What It Supports | Best For |
|---|---|---|
| ARC | Compressed 5.1 surround sound, standard audio formats | Older TVs, soundbars, basic surround systems |
| eARC | Uncompressed audio, Dolby Atmos, DTS:X, higher bandwidth | Newer TVs, Dolby Atmos soundbars and receivers |
If the TV has an eARC port but the receiver only supports ARC, enable ARC on both ends. If both support eARC, enable eARC on both the speaker system and the TV — Dolby’s guidance confirms that eARC must be turned on at both devices to carry the full bandwidth audio formats like Dolby Atmos.
Setting Up The Room And Speaker Sound
Room size drives amplifier power more than most buyers expect. Dolby’s home theater setup guide suggests 50–100 watts per channel for rooms under 200 square feet (about 19 square meters). That range handles typical living rooms and most bedrooms comfortably; larger rooms need more power to fill the space without straining.
Placement matters as much as wattage. Center channel speakers belong directly above or below the TV, aimed at ear level. Left and right front speakers sit at equal distances from the TV, forming an equilateral triangle with the listening position. Surround speakers go to the sides or slightly behind the seating area, above ear level for most setups.
Firmware and device settings can still interfere after everything is wired. Official support pages commonly direct users to check and update firmware, then reset or re-enable ARC/eARC when the handshake fails. If sound drops or the receiver shows no signal, cycle the power on both devices, re-check that both ends have ARC/eARC enabled, and confirm CEC is on. The cited setup instructions apply to U.S.-market consumer gear broadly, but some menu labels vary by brand and region — the port names and the settings logic stay the same.
References & Sources
- Dolby. “Home Theater Setup Guide.” Provides room-size amplifier power guidance and setup fundamentals.
- Sony. “Setting the Audio Return Channel.” Details the Setup > HDMI Settings > Audio Return Channel procedure.
- Sony. “Connecting to a TV.” Explains ARC/eARC cable requirements and port matching.