Installing Railmaster Speaker in HO Atlas GP7

Model Railroader Electronics and DCC
1

I am trying to install the Railmaster Bass DSM8 which is supposed to fit in narrow hood units. Even though I cut the lugs off and removed the headlight and number board inserts I can’t get it to fit. I am using the Soundtrax TSUAT1000 that is plug and play for the Atlat GP7 and snaps onto the Atlas lugs on top of the motor.

I can get the speaker to fit in the shell but there is not enough vertical clearance to get the shell back on the frame…

I can put the numberboards in without the headlight inserts as was planning to use surface mount LEDs for the headlights anyway.

Has anyone had success with this application? I refuse to take out one of the flywheels. I think I must need a smaller speaker or perhaps the Tsunami board will have to be moved forward and the Atlas lugs that would normally snap in teh TSU board will have to be cut off to make the TSU board lie lower? Perhaps my problem is in trying to get the plug and play board to work with this speaker-- either use a smaller speaker or move the TSU board, or get a smaller Tsunami decoder to allow enough room for this speaker?

2

Without knowing exactly what the speaker and enclosure you’re using look like, you should be able to fit a 1/2" by 1/4" oval speaker into an Atlas GP. I have a couple GP-7s that use board-replacement decoders. I generally remove the rear light bar (actually trim it so there’s just a bit of it there) and put the speaker fairly far back inside the long hood facing down. It can be a snug fit so you might have to push it into place before reassembling the engine. Usually you can get it to work thru a little trial and error.

3

Thanks. I’ve got it figured out. I am still going to use the narrow rectangular Railrmaster speaker since it is a darn good on. I just have to cut off the studs used to snap the soundtraxx deoder n and move it forward. The speaker will go in the back face up.

4

Plug and Play is a bit of a cruel joke.[:-^]