Shenlonco ~ Can you please elaborate on what your recommendations were?

 I know what caused the short at the time and it was similar to what Meller described. My difference was I had a weak solder joint on a lead to the speaker. I visibly seen it touch with the open leg of the the battery lead. Soon after, the amp wouldn't work, following intense heat. Therefore, leads me to believe it was a short that caused one of the chip resistors to blow. I too were fiddling with a secondary amplifier at the time, so I'm open to other possibilities.

I'm not following how a secondary amplifier would cause the short as mentioned by Meller and myself. The TDA2822M amplifier is configured to put out less than it's maximum capability. Under factory spec, this amp has a tolerance of 4-8 ohms with the supplied voltage of 7.2v http://www.datasheetcatalog.org/data...onics/1464.pdf

Now what I'm confused about is, how would a secondary amplifier cause the first amplifier to work harder that it would short? The secondary amp has no ability to command more input, only provide more output. Can you please explain?