Have one and qauestion makes me wonder why you are asking.Thinking you could do a drop in chip upgrade?Was suppose to have p[rety good red book to begin with but now I notice nobody wants to upgrade it (when they will do upgades on other models from same time frame).With all chip advances and upsampling I think it may have seen it's day unless one wants multiple and external DAC.
Chazz
Chazz