602 S2 bi-wired
I bi-wired my 602's and it improved the bass. These aren't floor-standers so they don't do bass much but I was able to disengage sub-woofers and run the 602's at full range and noticed a deeper punch to the bass. I use Belkin FastCat 4pr 24AWG wire (8 strands) that I purchased from Circuit City for a dollar a ft. It's patch cable wire they use in the auto install garage.
BTW, I cannot hear a discernable difference
between the Belkin cable used for the bi-wire (other than a punchier bottom)
at a dollar a foot (spent 20 bucks) and the non bi-wire Transparent Speaker wire (The Wave 200) I spent almost $300 for. The Transparent wire is prettier, I guess...