Please note :
The PPX4010 doesn't have speaker, in order to play sound you need to use the laptop internal speaker.
Proceed as follow :
Windows laptop:
Go to control panel / sound / playback. Select your speaker from the devices and 'set as default'
Apple laptop :
Open the Output panel of Sound preferences, choose Apple menu > System Preferences, click Sound, then click Output. select the internal speakers as sound output device