Audio System

This would be a fun build

• 4x Audio Exciter : https://www.parts-express.com/dayton-audio-daex25fhe-4-framed-high-efficiency-25mm-exciter-24w-4-ohm--295-224

Put the electronics in a box, the speakers are based on this so 2 or 4 speaker panels.

https://www.parts-express.com/resources-buyers-guide-exciters

Integrated

Has 2 50W channels. Probably plenty and simplifies the project. Get one with an audio jack too.

Structure

Regardless of the other details this is going to have a base and the speakers. The base will mount the electronics but it also provides support for the speakers which are suspended.

I'd like to do it as one sheet with the speakers spaced meaningfully across. But it may make more sense to do it as either 2 or 4 pieces.

It looks like the speaker will be made of thin spruce, Maple could also work. I'm not quite sure how to do that, but my gut reaction is to make my own 2ply sheet. Cut thin strips of ply and glue them up so that one layer runs perpendicular to the other. I think I'm shooting for less than 1/8th inch, so I'd probably cut the veneer to just under that and sand it down after the glue up.

Another approach could be to make thin wood veener and epoxy it to fiberglass. This will give it a clean wood look, but with the rigidity of a composite material. https://www.amazon.com/Bondo-20128-Fiberglass-Cloth-sq/dp/B002JRGOT8/ and as much as it goes against my taste, just buy some veneer https://www.veneersupplies.com/categories/Raw__Wood__Veneer/Bargain__Bin/

Power

I really don't want a cord (always) hanging down, so I think I'll add batteries. I need a BMS board and some cells. Probably a 2x4 arrangement. However, the BMS systems can draw a lot of power, so I'll need to add a current draw limit and take the voltage drop of that into account. Though that may be overthinking it. I may be able to just drop in a current limit resistor. At 12.6V, 2A would flow across just 6.3Ω. So a 5V high current resistor should work.

BOM

• Bluetooth Audio Module: $9
• Exciter 4x$8.25 = $33
• Batteries: $10
• BMS : $7
• Charger: $7
• Fiber glass $8
• Epoxy $20
• Veneer $20

$114 for parts