I currently have a 36" Sony TV hooked up to an older Technics receiver thats uses 2 bookshelf speakers. I'm looking to upgrade the speakers and was hoping to move into a home theater type setup. My receiver has only 4 speaker outputs and no output for a sub-woofer. I really don't want to buy a new receiver. Can I get into the home theater arena with what I have or do I have to start over with new audio equipment. What would be a good first/next step? My focus is to move to home theater/surround sound as I watch more movies than listen to music, but my wife listens to music. Any advice would be appreciated.