I've used that same speaker. I dont remember which wire is which, but I just tested and figured it out. There are only two ways it can go. You won't fry it if it is incorrect.
Im gonna use the bigger case for this project, it will be easier and better battery life.
I got donor buttons and a dpad. The controller is ultra simple I was kinda laughing at it.
@Bush, is that the only two connections it needs? Because I'm have two wires currently on it, audio in, and ground. I run the audio signal from the RCA cable to audio in, and run the ground to well, ground.
Yeah, it is a mono speaker. If you run the other channel line into the input pin, you could make a mono speaker with both channels... but that is kinda useless as I believe the atari 2600 is mono. But yes, two pins, audio in and ground. Decent speaker btw; used it as a GBA speaker replacement. Should be great for Atari sounds.