I found in both our 2014 Classic and 2015 23D International Serenity that the sub-woofer is a power hog and is "ON" all of the time that the battery is connected. So I put an on/off switch inline of the power cord to the sub-woofer and removed the parasite power draw when the trailer is parked without shore power.
WBCCI Life Member 5123, AIR 70341, 4CU, WD9EMC
TV - 2012 Dodge 2500 4x4 Cummins HO, automatic, Centramatics, Kelderman level ride airbag suspension, bed shell
2014 31' Classic model 30 twin beds, 50 amp service, 900 watt solar system, Centramatics, Tuson TPMS, disc brakes, 16" tires & wheels