Hi to all I designed a speaker case for a 9x16mm speaker to fit in the rear of the 1997 frame diesels. No machining is required to fit this under the PCB extension. It provides extra volume to improve the sound a bit. I use OWS speakers from DigiKey, about a buck each. With an ESU 58751 you only need to attach the two speaker wires- really simple installation. The shell pushes down the rear portion of the PCB, or you can tape it down, does not matter. The .stl build file is:
https://www.tinkercad.com/things/kQeRBdwSFrH-speaker-case-for-gp38-atlas-n-scaleIt is open for use or modification- no commercial use, please.
