Here is my simple terminal post bracket for mounting to your subwoofer enclosure using M8 bolts and nuts/washers. The bracket is 10mm thick so you need to calculate the length of your screws based on the thickness of your box. Accepts standard M8 nuts.

Made it for dual voice coil subs so you can change the impedance from outside the box using jumpers.

I am using stainless hardware but copper and brass will be better conductors.

From inside of the box I just used a washer between the terminal and the wood as well as a foam strip as a sealant.

Creality

Ender 3

No

No

200

50