I bought a sur. sys. 4 or 5 years ago and want to upgrade the rec. to a 5.1 capable system, my question is: Can I use my old speakers and buy a new amp (Denon 2802)Speakers are as follows: Subwoofer Infinity CUO303-24352; Center Klipsch 12010X; Satellites Klipsch 1201D4X; and Rear Speakers Atlantic Research 254.1SR. Can anybody tell me if these speakers can be used with a modern rec to provide a decent surround system?