Zoë and Rick, your ideas seem pretty interesting. I'm thinking now to add a sub to my system. I am using 2 pairs of speakers so, I'd rather prefer to connect the sub to the preout via interconnect. That does mean that I'd have to use an RCA cable splitter? Is it better to connect the sub to the CD player out or to the pream out? And one more question: is it the 100W sub powerful enough to match 2x175W Infinity pair of speakers + another 2x90w Energy pair of speakers? Thanks!

Adrian