Ohh I thought you said you got a new headunit and this happen to the new one... No wonder why its a vr3.. Sorry if it was me I would just go inside and get some random car speaker and hook a small speaker wire up to it and then unhook one speaker from the hu and try it. Or take the whole...
If theres smoke Ahhh did you hook the vr3 back up yet and see if ya got sound? Just unhook the power wires and ground and 1 speaker on your new hu. See if you have not done this.