The internal amp on my 10-year-old Audioengine A2s gave out. Rather than trash perfectly good speakers, I converted them to passive speakers.

After conversion, you're left with holes in the A2 backplate that can negatively impact sound. These plugs are designed to fill those holes.

If you'd like to modify the sizes, I also posted a parametric Fusion file. These should work in just about any material. I've tested both PLA and TPU.