Press the volume control to access the audio menu. Navigate through the audio menu by pressing the volume control button repeatedlly until you get to Fader. Then adjust the Fader to by turning the volume button to either 9R or 9F. In my trailer, 9R is for inside listening, only.
Assuming you have one set of speakers inside of your trailer and another set outside, these are probably set up as Front/Rear.
Use the Fader control to adjust - you should be able to adjust so that you can have inside only, outside only, both.
Read this for details
https://www.jensenrvdirect.com/downloads/dl/file/id/407/jcd2010_owners_manual.pdf
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