We got a big upgrade to Annabelle's sound with the addition of
Clamped to heavy dowel and bolted to this sturdy as heck frame
BOSS AUDIO MCBK420B Black 600 watt Motorcycle/ATV Sound System
Sound from audio jack, single dial can get super loud. The previous speakers were muffled as well, so having them at floor level helps a great deal. Battery power now goes a long way.