I like the KISS principal myself but whatever floats your boat. The more things you put in the reproduction chain the farther it will be from the original sound but if that does not bother you go ahead.
1 preamp out to a 2nd preamp in any harm?
I have two preamps and would like to run the feed from one preamp to the input section of the second preamp and from there to a monoblock amp to drive a subwoofer. I do not know if there is potential damage to any of the equipment by doing this. Or is it better to get two y out from the cd player with a feed to each preamp?