Alright Glacial, I've followed a lot of the threads, especially the heated cable threads, just want to say a while ago I upgraded my preamp to a Rotel RC870BX and I also got hold of Nordost Black Night interconnects on the cheap. I listen to classic rock mostly, Purple, Sabbath, Rainbow etc... and have to say the Nordosts sounded thin as hell the bass was lacking and everything was brightened up which wasn't what I was after.
I gave them a couple of months but got sick of them and have just reverted back to my old Cambridge Pacifics, what a difference! The bass and sound that I like has returned, maybe there isn't the seperation of the nordosts but I don't really think that was the sound I was after, I want fullness and a thick sound. Which is what I now have got. So I concur that a change of cables can make some difference, those nordosts maybe better for other styles of music but these Pacifics though a cheaper brand sound better to me.
As for the OP any advice on speakers for rock and metal is secondary compared to testing some out for your self. Though you probably know that anyway.