ICE50ASX2 ground wiring

Hi!
I'm building two stand-alone speakers: three-way, one ICE50ASX2 (BLT) for each one. I thought i would just build a wood box, it'd be way more difficult to use metal or any other material. But since it's wood, how am i supposed to connect the ground wire? I know it can't go in the wooden box right? Every single amplifier built i've seen online (with the ICE50ASX2) is fit in a box made out of conductive stuff, so they would just screw the wire to the box. Where is the ground connection from the board to the box? I thought it may be on two of the four holes for the screws, but i can't find this information anywhere.
thank you!

(i'm talking about the two holes on the left)
Screenshot 2023-03-16 alle 11.21.46.png
 
Please use a metal box connected to PE as usual with sensitive electronics and/or radiating electronics. More difficult is normally better. Make sure to use a metal box with enough ventilation as the 50ASX2SE will be warm/hot. It does not need a fan but my habit was to glue small heatsinks to the active parts that I found to be hot with an IR camera. The module itself does not need PE but AFAIK it makes contact to the casing by means of the metal standoffs.

The Ghent casings are OK and they're made of metal, they also have the wiring harness with them so 2 birds with 1 stone:

https://www.ghentaudio.com/kit/a215-s1.html

There is a manual available how to use these modules:

https://www.parts-express.com/pedoc...class-d-amp-with-power-supply-2x50-manual.pdf

BTW these modules are good and easy to use (except the wiring) but more recent class D ICs/boards outperform these in subjective terms.
 
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