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Troyes in France.I use a Raspberry for filter low and mid-high audio. Next step, add a light (like the picture) that changes according to the music in the box, and maybe on the sides of box.I use the same amplifiers, but it's work in 24v. I bought 4 lead batteries (12V 18Ah), but it's so heavy. So I now use 2 batteries and a voltage regulator for the 5V (bluetooth & raspberry).The sound is really amazing !
I Made it since one year ago. The best sound system ;-)You can see it on this video:You can
How to make a trailer mounted bike sound system