My present configuration involves an empeg player, a two-channel amplifier, and front/rear speakers on each side connected in parallell to the lef/right outputs of the amp.
My upgrade path looks like it'll be

1) 4 channel amp, or a second two-channel amp.
2) A subwoofer
I'll probably buy a "self-contained" sub which I can have in the trunk, and just remove when I need the space.

My question is: How do I mount the Sub?
Can it be connected to *both* the left and right rear speakers? Connected to only one of them? Add a separate amplifier? How is this amplifier connected to the 4 outputs of the empeg player?

Any suggestions?

Marius (Escort Cab + Mark II)