Bose S1 Pro. Thank me later. Its actually a battery
powered busking amp with Bose array technology. Sounds great no matter where you are standing because that arrary tecnology surrounds the space with sound. Much, much better than your standard point and shoot speakers where the sound quality is only good in one small spot.
Another plus is you can plug
in a mic and guitar/keyboard and put on a small concert for the whole marina. It can get loud if you want it too, but also whisper quite that sounds great even around a 90 degree bend.