Thanks for answering.
Years ago I connected my One Gauge Challenger to a small home speaker directly. The sound was full and rich. Very deep lows.
So I'm just wondering if something is getting lost and where exactly in the chain.
I bought the same transmitters that Willy Gee got and never did anything with them. Every time I've done an install, I've completed it without considering hooking up a transmitter. I think I'd like to hook it up as a stationary decoder and just add it to a train. That way the board could be hooked directly to the sound system without any signal loss of a transmitter. If the decoder is built into a consist, it should react with the same throttle positions. The part I don't like, is I can't figure out how to achieve the full effects of the train entering and leaving the given area of the layout. I got rid of my large mixing console now so again, I'm not attempting this one either.
I feel I'm getting lazy trying new stuff. It's fun to watch others try out stuff though. It's great to have knowledgeable people here to help.