My outside speakers are controlled by the Zone B switch on the radio. Unfortunately, when you switch them off they will be on by default when 12 volt power is switched off and then back on, making having them on by mistake easy to do.
I think that exterior RV speakers are an abomination. I cut the speaker wires that power them; when connected, it's just too easy to accidentally have them on and thereby disturb the neighbors.
Since exterior speakers can leak, I removed mine and covered the hole with some Eternabond. Now no chance of noise or leaks.
There's lots of advice and information in forums... sometimes it is correct. For example, all of my posts are made by a political appointee who got the job as a reward for contributions to my diesel bill.
2011 Jayco 28.5RLS; 2008 Chevy Duramax; Pullrite Superglide Hitch