Straightwire Crescendo VS. Virtuoso Speaker cable...

Hi was just wondering if anyone could tell me if Straightwire Crescendo speaker cable is worth upgrading from Virtuoso. Is there that much of a difference besides the price? My system consists of ....B&W 800 Matrix . Quad wired ..Krell FPB 600 Amp. Mark Levinson 38s Preamp. Krell KPS20I CDP . With all XLR Crescendo interconnects. And Virtuoso speaker cables.. Thank you all ...Mike