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I have added Soundtraxx DSD-LC sound decoders to a Bachmann Spectrum 2-8-0 with its on-board speaker, and to LL P2K 0-6-0 and 0-8-0 steamers, using a medium size oval speaker firing up through the coal load. I think they sound really nice, although I've never heard a DSD equipped loco for comparison. Same decoder series are in a BL-2 firing up through the fan grilles, four Atlas RS-3s mounted on cut down weights, and a Kato RS-2 with one weight removed. None of the speakers have baffles since the shell is such a tight fit for the oval speaker I used. The shell pretty much acts as a baffle. Sealing the speaker to the Atlas weights (holes drilled in them to let the sound out) separates the forward pulse from the rear pulse. Not having the baffles doesn't seem to make any difference in any of the Diesels. They sound good to my ear, aren't so loud as be annoying after a while of running, and the sound level for bell, horn and engine can be raised or lowered independently. I set them so I can just about hear them from the far side of the layout.
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