Here's the method:
PC > X10 wireless transmitter with L/R RCA jacks > X10 wireless receiver with 10W amp and spring speaker terminals > speakers.

So, as you can see, I need a way to step up the wattage after the wireless receiver, which I wasn't sure was possible. It's probably not worth it anyway, but if it was inexpensive and could possibly include an equalizer, I thought it would be worth it.

tinny

Thought so. Should have at least followed my instincts and looked it up on dictionary.com like I usually do

These speakers do sound "tinny", and I agree that a sub would improve things, but there isn't room for a computer and a sub under this table. I might be able to convince them one day...