Speakers have nothing to do with RV voltage it is the power output of the radio.. that part is plug and play so don't worry about it. A good automotive radio stuck in there will ALWAYS beat out an RV system
2004 Chev Silverado Duramax optioned past the max. 2009 Jayco Eagle 308 RLS 765 watts of solar, 6-6 volt batteries (696 amp hour), 2000 watt (4000 surge) whole house inverter.
140 days boondocking in 2016
211/2015, 196/14, 247/13, 193/12