My Forte' Audio Model 55 seems to work with my Silverline Preludes to provide the best imaging and resolution I can remember (can I remember imaging?...hmmm). Single wired sounds better than bi. I've owned, among other piles of stuff, Vandersteens, tube and SS line stage preamps with Eagle 2, Aragon, Parasound (unhip sort of but VERY good amp), Acurus, various Adcoms...blah blah...and the Forte'/Prelude combo is very revesaling (currently with a recently discontinued Adcom 715 preamp...another amazing value). I stuck a REL Q150E sub in the system and it really opens up the soundstage for some reason. Who knew?