Polk Signa S4 No Sound: What Usually Causes It
If your Polk Signa S4 has power but produces no audio, the problem is usually in the connection path, TV audio output settings, or a muted soundbar setting.
The good news is that most no-sound issues can be fixed with a few systematic checks before you assume the hardware has failed.
The Polk Signa S4 is a Dolby Atmos soundbar designed to work best with HDMI ARC, though it also supports optical and Bluetooth.
That flexibility is helpful, but it also means several settings on the TV, source device, or soundbar itself can prevent audio from reaching the speakers.
Check the basics first
Before changing advanced settings, confirm the soundbar is actually ready to play audio.
- Make sure the Polk Signa S4 is powered on and the indicator light is active.
- Raise the volume on both the soundbar and the TV or source device.
- Check that the soundbar is not muted.
- Verify the input source on the soundbar matches the device you are using.
If you are using the included remote, test the volume buttons and source selection.
A soundbar can appear “on” while still being set to the wrong input or muted at a very low volume.
Confirm the correct connection type
The most common Polk Signa S4 no sound issue comes from a mismatch between the cable used and the TV’s audio output configuration.
HDMI ARC connection
HDMI ARC is the preferred connection for the Signa S4 because it enables higher compatibility with modern TVs and allows TV remote control of the soundbar volume.
For ARC to work, the HDMI cable must be connected to the TV’s ARC-labeled port and the soundbar’s HDMI ARC port.
- Use the TV port labeled HDMI ARC or eARC.
- Use the soundbar port labeled HDMI ARC.
- Replace the cable if it is damaged or old.
- Power-cycle both devices after reconnecting.
If the TV is connected to the wrong HDMI port, the system may show video but send no audio to the soundbar.
Optical connection
If you use an optical cable, confirm both ends are fully seated.
Optical cables can feel connected even when one end is not clicked into place.
Also check the TV’s digital audio output setting, since some TVs default to an unsupported format.
- Remove the protective caps from the optical cable ends.
- Look for the red light in the optical port when connected.
- Set the TV audio output to optical or external speaker.
- Choose PCM if surround formats fail.
Bluetooth connection
With Bluetooth, the soundbar may be paired but not actively connected.
Open the device’s Bluetooth menu and verify the Polk Signa S4 is selected as the active output.
If a different speaker, headset, or smart TV audio device is selected, you may hear no sound from the soundbar.
Review TV audio settings
Even with a perfect cable connection, the TV can block audio from reaching the Polk Signa S4 if the output format is incompatible.
Check these settings in your TV menu:
- Audio output: set to external speaker, soundbar, or HDMI ARC.
- Speaker setting: disable TV speakers if the system requires it.
- Digital audio format: try PCM first, then Dolby Digital if supported.
- eARC/ARC: enable if both the TV and soundbar support it.
Many TVs are set to output multichannel audio formats by default.
If the soundbar is not decoding that format correctly, switching to PCM can restore sound immediately.
This is especially useful when troubleshooting streaming apps or cable boxes.
Inspect source device and app audio
If the Polk Signa S4 no sound problem happens only with one device or app, the issue may not be the soundbar at all.
Streaming apps
Some apps output audio differently depending on the title.
If Netflix, Disney+, Hulu, or another app plays video without sound, test another app or another title.
Confirm the app volume is not muted and the device audio output is routed to the TV or soundbar.
Cable boxes, game consoles, and media players
Set the source device to a compatible audio mode.
For example, a game console may be outputting an unsupported surround format, or a media player may be set to bitstream when PCM is needed.
Temporarily changing the audio format can help isolate the problem.
Phones and tablets
For Bluetooth playback, disconnect and reconnect the pairing.
On some phones, media volume and Bluetooth device volume are controlled separately, so both must be turned up.
Power-cycle the soundbar and connected devices
A simple reset often clears audio handshake failures between the Polk Signa S4 and a TV.
HDMI ARC and Bluetooth connections can become stuck after power outages, input changes, or firmware glitches.
- Turn off the TV, soundbar, and source device.
- Unplug each device from power for at least 60 seconds.
- Reconnect the soundbar first, then the TV, then the source device.
- Power on the TV and select the correct input or app again.
This process forces the devices to re-establish the audio connection and often resolves silent output after the system had been working previously.
Test with a different cable or input
When troubleshooting no sound on the Polk Signa S4, swapping cables is one of the fastest ways to rule out a physical fault.
- Try another HDMI cable that supports ARC.
- Try another optical cable if you use optical audio.
- Test a different HDMI ARC port on the TV if available.
- Connect a different audio source to see whether the soundbar responds.
If the soundbar works with one source but not another, the issue is likely in the source settings rather than the speaker system.
If nothing works across multiple devices and cables, the soundbar or TV port may need service.
Check for firmware or compatibility issues
Firmware can affect HDMI ARC handshakes, audio decoding, and Bluetooth stability.
If your Polk Signa S4 suddenly stopped producing sound after a TV update or device change, compatibility may be the cause.
Review the TV manufacturer’s support notes for known ARC or eARC issues.
Some TVs require a software update to handle external audio devices correctly.
Likewise, if the soundbar has firmware update support through Polk, install the latest version according to the manufacturer’s instructions.
Use these symptoms to narrow down the problem
Specific symptoms can point to the root cause faster than random troubleshooting.
- No sound from TV apps but sound from Bluetooth: likely a TV ARC or audio format issue.
- Sound only on one input: likely a source-setting or cable problem.
- Soundbar responds to volume but stays silent: likely muted input, wrong source, or incompatible format.
- Sound cuts in and out: likely unstable cable, loose connector, or HDMI handshake issue.
- No sound after a power outage: likely a connection reset is needed.
When to suspect a hardware fault
Most Polk Signa S4 no sound cases are configuration-related, but hardware failure is possible.
If the soundbar remains silent across multiple TVs, cables, and input types, the internal amplifier, speaker drivers, or main board may be damaged.
Signs that point toward hardware failure include:
- No audio from any source or connection method.
- No response from the soundbar even when volume changes.
- Intermittent crackling followed by complete silence.
- Visible power issues such as random shutdowns or no indicator light.
At that stage, document the tests you performed so support can quickly determine whether repair or replacement is needed.
Fast troubleshooting checklist for Polk Signa S4 no sound
- Confirm the soundbar is powered on and not muted.
- Verify the correct input source is selected.
- Check HDMI ARC, optical, or Bluetooth connections.
- Set the TV audio output to external speaker or ARC.
- Try PCM if surround output is failing.
- Power-cycle the TV, soundbar, and source device.
- Swap cables and test a second source.
- Update firmware if available.
Working through these steps in order usually identifies the cause of a Polk Signa S4 no sound issue quickly, whether the problem is a TV setting, a loose cable, or a compatibility glitch between devices.