After searching long and hard for an audio solution that fit the P500 well and wasn't a ridiculous amount of money, I decided to go the DIY route. I'm mounting a set of $69 Pyle 6.5" marine speakers with integrated Bluetooth in the front of my tractor supply cargo box. The speakers can be found here. So far, it's coming together nicely. The speakers require only a 12v source. That will come from an additional fuse panel behind the dash and a switch panel to replace the warning placard. Since the plastic box sides are a bit uneven and wavy, there were gaps around the speakers in between the mounting screws. To solve this, I am 3D printing 1" thick reinforcement rings that will sandwich the box from the inside. These will also offer some impact protection for the backs of the speakers. I may design and print guards that will protect them even further. I've already tested the speakers in the box and they sound great paired to my 7" tablet mounted on my steering column, especially with a bass boosting equalizer app.
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