FR, high efficiency bluetooth speakers

I was wondering if someone has already done something like that. Otherwise, gather feedback.

So summer is coming, cookout and bbq season is around the corner.

It is nice to play some smooth soul while sipping cocktails.

Ive been having this idea of buiding cheapish set of speakers using an somewhat efficient full range and power it using some chi-fi stereo bluetooth module. Up to 10w would be plenty I believe.

Thinking about bass reflex, visaton bg20 that have 92 something sensitivity. The cabinets would be pretty big I belive, around 60 liters to go down as low as Fs 38hz , right? Would put them on wheels. Sensitivity would drop a bit as they would be placed outside no walls - need bsc.

Power would come from a battery.

Has anyone done a design like that?
 
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