Optical Cable Receiver: AVR Inputs Used Right
Quick answer / TL;DR: An AV receiver typically carries two to four optical TOSLINK inputs and at most one optical output, and that output is often tied to a zone rather than to the whole unit. Assign the television's optical out to input 1, a console or media player to input 2, and leave the last socket empty as a buffer. Rename every input so the front panel matches the device. Keep sources that already have HDMI on HDMI, where the receiver switches picture and sound together, and use optical for the devices that have no HDMI or whose HDMI path is unreliable.
A receiver does not have an optical problem, it has an optical budget: two to four TOSLINK sockets on the back panel and a list of devices that all want one. The question is never whether the cable fits. It is which socket each source should take, what the front display should read when it is selected, and which sources are better left on HDMI entirely. An AVR is a switchboard, and the optical ports are a small, fixed allocation on that board.
This is the receiver-side view: how the inputs are counted, how they are assigned, why the rename menu matters more than the cable, and the one routing trick that makes the optical output worth having.
The Socket Count on the Back Panel
Count the TOSLINK ports before planning anything else. Mid-range receivers usually give you two, the step-up models three or four. The outputs are the scarce resource: one optical out is common, two is rare, and on many models the output is not a mirror of the input but a fixed tap on one zone or one source. That asymmetry shapes the plan – room for several sources, and one place to send sound onward.
Inputs are cheap, outputs are not
An input costs the manufacturer a receiver module and a socket; an output costs a transmitter and a decision about what signal to place on it. That is why the back panel is generous on the way in and stingy on the way out. Plan the inputs first, because they are the part with room to spare, and treat the single output as a bonus rather than a design assumption. If the plan needs two optical destinations, the second one comes from a splitter or from a different socket type, not from a second optical port.
Assigning Devices to Sockets
| AVR input | Typical device | Label to set | Why this one |
|---|---|---|---|
| Optical 1 | TV optical out | TV | The everyday source, the one that must never be wrong |
| Optical 2 | Games console or media player | Game | Second in line, used with a controller in hand |
| Optical 3 | CD or network streamer | Music | Left alone for listening, no video attached |
| Optical 4 | Spare, or a second TV | Spare | Kept free so a new device needs no replanning |
| Coaxial | Anything with a coax out | Coax | The same protocol on a different socket |
| HDMI | Blu-ray or streaming stick | by device | Picture and sound in one cable, no optical needed |
The assignment follows the frequency of use, not the quality of the port. Optical 1 should be the source switched on without thinking – the television, in most rooms – because it is the input the household lands on by default and the one a mislabelled display confuses. Console and player go next, the music source after that, and the last socket stays empty on purpose. A spare optical input is a buffer against the next purchase, and it costs nothing to leave unplugged.
Labels and the front display
Every receiver lets you rename an input, and almost nobody does it. The front panel is the only feedback the room gets, and when it reads DVD while the television is playing, someone on the sofa reaches for the wrong remote. Set the label to the device's real name – TV, Game, Music – and keep the same convention across the HDMI inputs, so a glance tells you which world you are in.
Source Priority and the Order of Switching
Priority is a physical fact in most receivers: the unit plays whatever input is commanded, and there is no arbitration between two active optical streams. Two devices playing at once means the selected one wins and the other is silent, which is correct behaviour and also the source of the classic support call – the console is on, the television is on, and the sound comes from the wrong one.
The fix is a habit rather than a setting: one source at a time, and the input key is part of turning the system on. Where a television and a console both want optical, move the console to HDMI if it has one, because the HDMI switch has a defined hierarchy and the optical sockets do not.
When the Receiver's HDMI Switching Wins
A receiver with HDMI inputs is a video switch and an audio processor in one box, and when a source offers HDMI, that path is better every time. Picture and sound arrive together, the receiver processes both, and the display is never selected separately. The optical route costs an extra cable, an extra assignment and one more place for the two halves to disagree. Keep optical for devices with no HDMI, or for older ones that drop audio on a handshake, and let the HDMI switch carry everything else.
The Zone 2 Optical Trick
The optical output earns its place in a second-room setup. On receivers that route a chosen source to zone 2, the optical out can feed a compact DAC and a small amplifier in another room, or a pair of active speakers, without touching the main room's processing. The second room follows whatever source the zone is assigned to, at its own volume, whether or not the main zone is running.
- Zone 2 assigned to the music input – the streamer plays in the kitchen while a film plays in the lounge
- The optical out into a compact DAC, then into a small amplifier or a pair of active speakers
- Volume set separately in the second room, never by the main volume dial
- The main zone switched off where the model allows it, leaving the second room running
- One source only – the zone follows an input, it does not mix two of them
One limit to check before the purchase: on many receivers zone 2 is analog only, and the optical out is not offered to it at all. The feature appears on the specification sheet far more often than it appears in the menu.
AV receivers are specified by input count, output count and zone routing, and the optical section is one line of that sheet: two to five TOSLINK inputs, zero to one output, analog or digital zone 2 depending on the model. The catalog lists the input count, the output behaviour and the zone type per part number.
Related reading: The cable that reaches input 1, seen from the television side: optical cable for TV — optic-cable-for-tv
Related reading: The other route into the same receiver, weighed up: is eARC better than optical — is-earc-better-than-optical
Frequently Asked Questions
How many optical inputs does an AV receiver usually have?
Two on most mid-range models, three or four on the step-up units. The outputs are the scarce part – usually one, and often tied to a single zone rather than to the whole unit. Count both before planning, because the inputs set how many sources fit and the output decides whether a second room is possible.
Which device should take optical input 1?
The source used most often, which in most rooms is the television. It is the input the household lands on by default, and the one where a wrong label causes the most confusion. Console and player go to the next socket, the music source after that, and the final socket is best left empty so a new device can be added without replanning the panel.
Do I still need optical if the device has HDMI?
No – use the HDMI. The receiver switches picture and sound together on that path, applies its processing to both, and gives the display a single source to select. Optical adds a cable, an assignment and a second switching layer. Reserve the optical sockets for devices with no HDMI output, or for older equipment whose HDMI handshake is unreliable.
Can the optical output feed a second room?
On receivers that offer a digital zone 2, yes – the optical out feeds a DAC or a pair of active speakers in another room, following the source assigned to that zone at its own volume. Many models restrict zone 2 to analog inputs, though, so confirm the digital zone line in the manual before building the plan around it.
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