I REALLY HOPE THAT I'M WRONG HERE...
Don't tell me you bought this off of the back of a white van? Or off of Craigslist? Sorry to break it to you but from what I know, this is a knock off of the Panamax name.
150 watt speakers don't mean much. 1000 watt system means nothing. 250 watt sub is questionable? Find a basic home theater receiver and see how things sound (older name brand, not unknown name, Marantz, Denon, Sony...).
I wouldn't spend much on the receiver since you may end up cooking it.
Check out the Paramax web site: just enough info to fool you if looking quickly. Try the dealer locator for example.
Good luck and sorry to be so negative.