It is the Acoustic Research Pro Interconnects. I have demo'd them, and while they are good for $20 a pair, they are definitely bright. Also, if you search the other Audiogon threads you will find one where someone asked about the AR cables. The conclusion of the group was they were very bright. Here is the link.
http://audiogo5.iserver.net/cgi-bin/fr.pl?fcabl&1002045978&read&keyw&zzacoustic=research
A better power cord will improve the Cambridge, but not in the bright area. The bass will be tighter.