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That's easy, use the DSD-150LC Plug and Play for that replaces the Atlas circuit board with the combo decoder/sound board. You have to cut off the part of the weight that sticks into the shell above the drive shafts. Actually, you would not have to cut that part off on the long hood end but it makes me feel safer. It gets really close to the ends of the soundtraxx board. I build a small speaker enclosure in the area of the cab and aim the speaker up to the inside roof of the cab (3/4" dia speaker). I open the side windows in the cab to let out the sound. Paint the styrene sound enclosure black and glue some cut down figures to help draw the attention away from the "big black box" in the cab. I can send you some digital photos if you would like to see them. I have done three so far. I wanted to cut down the speaker to avoid having to thin the front and back cab walls. I also wanted to be able to use the stock front and rear cab glass. Also, with the DSD-150LC you will want to program the exaust volumn (CV-122) to 255 (hex FF). The DSD-150LC decoders run a little on the quit side compaired to the DSD-150 and DSX-150. For RS-3 the only way to get sound and keep that much needed weight is to use the 150LC plug and play decoders. If you want the pictures email me at jkraker@crowniron.com , that goes for anyone out there.
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