We solved our outside speaker problem with using a wireless BLUETOOTH speaker setup purchased from AMAZON. WALMART has a big selection for different Bluetooth type speakers. Unbelievable sound quality and you just sit the speaker anywhere with no wiring. Works all around the outside of the trailer areas.
If it was demonstrated when you got your trailer they have to be there somewhere. Perhaps they are to be plugged in an outside jack or something. Look for two speakers stowed inside the trailer somewhere. If the speakers were built-in surely you would be able to see where they are mounted outside.
My POPUP trailer has outside weatherproof speakers built-in to the patio side outside wall... The JENSEN Radio uses the front-back controls to run the inside-outside-both depending where you have the controls set...

Roy Ken