Sound from the Subwoofer is too low.

IMPORTANT: This article applies only to specific products and/or operating systems. Check the Applicable Products and Categories section of this article before starting these steps.

Follow these steps to troubleshoot the issue:

Note: The subwoofer is a speaker for playing bass sounds. Sound from the subwoofer may be hard to hear when the input source has less bass sound.

1. On the remote control, press the + (plus) button of the SW (subwoofer volume) to turn up the subwoofer volume.
   Note: The button name varies depending on the model (subwoofer volume, BASS, etc.).
2. If Night mode is set to ON, set it to OFF.
   Note: For details regarding Night mode, refer to the product manual.
3. For the HT-A7000, A5000, and A3000 only: Make sure the Sound Field Optimization is complete. You can start the optimization on Home → Setup → Advanced Settings → Speaker Settings → Sound Field Optimization, and follow the on-screen instructions. For details, refer to the Help Guide.
4. Try to play the test tone or built-in demo music to verify if any sound is coming out of the subwoofer:
   HT-A7000 / A5000 / A3000
   • Use the Test Tone function:
     1. On the remote control, press the HOME button.
     2. Select Setup.
     3. Select Advanced Settings.
     4. Select Speaker Settings.
     5. Select Manual Speaker Settings.
     6. Select Test Tone, and then select On.
        Note: Select Off to end playing the Test Tone.
   • Play the sample music following any of the steps:
     • Press and hold the input select button on the bar speaker for more than 5 seconds to start the playback.
     • Press and hold the MUSIC SERVICE button on the bar speaker for more than 5 seconds to start the playback.
     Note: To stop the playback, press the same button you have used to play the sample music.
   HT-A9 / X9000F / Z9F
   1. On the remote control, press the HOME button.
   2. Select Setup.
   3. Select Advanced Settings.
   4. Select Speaker Settings.
   5. Select Manual Speaker Settings.
   6. Select Test Tone, and then select On.
      Note: Select Off to end playing the Test Tone.
   HT-S20R / S40R
   
   Note: While USB input is selected, the TEST TONE will not be output even though it is set to ON. Select an input other than USB to ensure the TEST TONE is played.

   1. On the remote control, press the MENU button to turn on the front panel display menu.
   2. Select SPEAKER → TEST TONE → ON to output the test tone from each speaker.
   3. Press the MENU button to turn off the menu in the display.
      Notes:
      • To select the desired item and setting, press ↑ (upper), ↓ (lower), or ENTER repeatedly. You can return to the previous layer by pressing the BACK button.
      • To turn off the TEST TONE, select SPEAKER → TEST TONE → OFF

   .
   HT-S400
   1. Press and hold the TV button on the bar speaker for 5 seconds to play the built-in demo music.
   2. Press the TV button again. The built-in demo music will stop and the Sound Bar returns to the TV input.
   Other models
   1. Press the INPUT button or input select button on the Sound Bar for 5 seconds to play the built-in demo music.
   2. Press the INPUT or input select button again. The built-in demo music will stop and the Sound Bar returns to the TV input.