This is a Rectify Series drop-in speaker system for various Walthers Proto and Mainline locomotives using the 28mm round speaker encased within two weight halves held together by screws. No modifications are required to replace the factory speaker.

These fit the Mainline Phase II GP9, SD60M, SD70M, SD75i and the Proto U30B, GP20 and SD9 among others!

The speaker is a press-fit in the stock cavity, firing down through the frame. The loose half of the weight is discarded. Use a strip of thin mounting-tape to full secure the speaker.

If you have a factory sound model, you can reuse the 2pin speaker harness. If you need a 2pin harness, most of these Walthers models use the small, SH1.0 JST harness: https://www.scalesoundsystems.com/product-page/factory-pcb-speaker-harness-small

Originally available in two different heights from the flat-side to the curve’s apex, the 18mmH version has been discontinued, leaving the 16mmH version to be truly universal, fitting all models.

The speaker comes fully assembled and tested.

Dimensions are: 16mmH x 15mmW x 28mmDia

VIDEOS: 

Proto GP30 https://youtu.be/RnyLdApHPCM

Mainline GP9 https://youtu.be/E2h9RBZvyJE