Bluesheart (great name btw). This model had 2 speakers wired directly to the board. I used both leads on on speaker also when I was wiring in the 9volt to the USB I noticed that it worked better if it was hooked up backwards black to red and red to black. I don't know why but it just worked. I know very little about circuitry and electronics Im just a hack my self. I hope this helps.
Brian
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Brian