However, since I opted off purchasing the wireless speakers and wanted the regular wire/cable to plug to the outlet, i have always used them in that way. The speakers are pro media 2.1 computer (bluetooth) speakers. And plays the left side as well because they have one speaker test that when hitting it will do a jingle from the left and then to the right and now plays both left and right in the right 'only.' Put balance in middle it plays right speaker only and fully to the right plays right. Testing moving balance to the full left-nothing. or offline, and testing through the Realtek audio manager/controller the left speaker goes out.
I have computer speakers that are going through some balancing acts whereby when playing video online the right speaker will stop playing.