Speaker Diagnostics: Left, Right, Center and Bluetooth Audio Checks
Speaker problems often hide in one channel, one volume range or one output route. Test left, right and center audio separately, then repeat with headphones or Bluetooth if the device will be used that way.
Listen for balance and direction
Open the Speaker Test and play a left-only tone, then a right-only tone. The sound should clearly come from the matching side. If both sides play at once, the system may be downmixing, the headphones may be wired incorrectly or the device may only have mono output.
A center tone should feel balanced. If it pulls strongly to one side, check balance settings and speaker blockage.