This is a speaker upgrade for the Walthers Mainline and Proto line HO F7 or FP7. There are 2 mounting screws through the bottom of the chassis. Please check photos and dimensions for correct fitment (31 × 19 × 32mm). Our speaker upgrade kit is a vast improvement over the factory unit, with much higher volume, more bass and better mid-tones. There is no cutting or modification required to the model; the speaker kit simply screws into place with the factory hardware.

Like with all our speaker kits, a 4 ohm resistor is included to wire in series for non-ESU installations.

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