Once you install CleanROM 2.x, there is a set of features titled CLEANROM SETTINGS within the main settings menu of the device.
Within CLEANROM SETTINGS, there is a setting entitled 'headjack/headphone polarity'. Unchecked will mean that the device can ONLY be played with headphones ON. Instead, if you check the setting to REVERSE POLARITY, this will allow the device to play from the unit's speakers instead.
It's a fancy way fixing a bug that Black-Seraph encountered when creating this ROM. Basically, once you flash CleanROM 2.x on an XD+, the default setting will only allow users to hear sound with a headphone. Reversing that setting will remove the headphone icon from the top-right of the screen & allow sound to output from the speakers instead.
Hope this helps.