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Kato N Scale NW2 ZIMO MS-NW2_A246 DCC Decoder Installation

Last Updated 250928

DCC Decoder installation instructions for Kato N Scale NW2 with ZIMO MS-NW2_A246 DCC Sound Decoder and SBS4DCC "Tailor-Made" speaker enclosure.

Recommended sound file is ZSP00726 EMD 12-567.zpp.

Originally published on September 28, 2025.


Supplies:


Installation Notes:

  • Removed 3mm x 20mm of the rear split-frame in order to make room for a 12mm x 8mm sugar-cube speaker mounted in a custom 18mm x 8mm x 6mm speaker baffle.
  • Ran a 0.25mm black styrene strip directly beneath the decoder board bottom to protect from shorts.
  • Applied kapton tape to sides of the decoder to protect from shorts.
  • Speaker baffle required a bit of milling on the bottom and top to clean up the residual 3D printing flash.
  • Soldered brown 36AWG wire leads to the speaker and tightly wrapped kapton tape around baffle.
  • Speaker gently slides in between the split-frame and bottom of decoder board.
  • Last step was to use black Sharpie to blacken out the cab interior windows from the decoder mounted SMD LED’s.
  • Overall look and shell reassembly was excellent.

Installation Pictures: