Electrical System Brainteaser

Just a thought - the stereo may draw a lot of amps from the DC system, pulling the battery voltage quite low thus convincing the smart converter that it needs to go into its highest charge rate, which would be at about 16 Volts. If the stereo requires more than 300 watts (25 amps), I would consider a separate 12 V power supply for it when connected to shore power. Does it shake the whole RV and rattle the neighbours' dishes? If so, consider a lower power stereo with headphones for the listeners. Sorry I'm a little negative on loud music; it is the result of living across the street from a high school student parking lot where some student cars have the entire back seat area filled with massive stereo systems that rattle our dishes.