If you’re not hearing any audio from your speakers, please make sure that all cables are securely connected. If you’re still not hearing audio, try these suggestions:

• Bluetooth
• 3.5mm Auxiliary
• USB

Bluetooth

• Initial check: Make sure that you’re playing audio from the correct source device. The control dial LED should glow blue.
• If you have multiple Bluetooth devices connected (you can have up to two), try disconnecting the other and only play from one device.
• Move the audio source closer — it might be out of the range.
• Move the other sources of wireless signal away — you could be experiencing interference.
• Restart the Z407 speakers and the source device.
• Try unpairing and repairing your source device and the Z407.

3.5mm Auxiliary

• Initial check:
  • Make sure that you’re playing audio from the correct source device. The control dial LED should glow purple.
  • Make sure that the volume on both the speaker and source device are at medium level (50%).
• Your speaker might be muted:
  • Unplug and plug in the cables from both ends again.
  • Try to switch to other inputs and then switch back to AUX.
• Check that the cable is a 3-pole cable and make sure that it is securely connected to both the speakers and the source device.
• Try a different source device to make sure the issue isn’t with the device.
• Try using a different 3.5mm cable. Make sure that you are using a 3-pole 3.5mm AUX cable.

NOTE: If you’re streaming audio content from the internet, the issue could be with the internet connection and not your speakers.

USB

• Initial check:
  • Please make sure that you’re playing audio from the correct source device. The control dial LED should glow white.
  • Check that you're playing from the Z407 on your source device.
  • Check that the cables are securely connected to both the speakers and the source device. Try to plug and unplug the cables again.
  • Try a different source device to ensure the issue isn’t the device.
  • Try a different USB cable.
• Basic troubleshooting:
  • Unplug and plug the USB cable into another USB port or into the USB ports on a different computer.
  • Unplug the Z407 and wait for about ten seconds to ensure it’s completely powered off, then plug it back in.
  • Reboot your computer.
• Advanced troubleshooting:
  • If your source device is a laptop, please check that the Z407 is detected correctly in the Device Manager.
  • To open Device Manager:
    Windows 7, Windows 8, Windows 8.1: Control Panel > System > Device Manager
    Windows 10: In the Task Bar, right-click the Windows flag and select Device Manager

    

 NOTE: If you’re streaming audio content from the internet, the issue could be with the internet connection and not your speakers.