taming studio 100's

Just got my studio 100's and am using it with audioquest type +6 cables, which are bi-wired. Connected to an Odyssey Stratos amp. The speaker is a bit brighter in my living room than anticipated. Have a large throw rug and bare floors otherwise. Any suggestions for new speaker cables so that I could tame the brightness? Speakers were dealer demos so they should otherwise be broken in. Also, would appreciate any input as far as subwoofer settings for my paradigm pw-2200. Subwoofer is next to left speaker. Living room is 16X25. Speakers are 7ft apart and listening space is about 14-15ft away. Any input would be appreciated.