Audiolab questions??

I have an audiolab 8000p amp and the matching 8000c pre-amp. The equipment is about 12yrs old but still works flawlessly. I have heard that I can bi-amp my system with this equipment. What do I have to purchase to accomplish this? Do I just have to find another 8000p and go from there? Any help would be appreciated. If the answer is yes does anyone out there know where I could find one of these amps??