Speaker cabels for dark sounding speakers?

Hej

My speakers are considered to be dark sounding and it has been OK with me until I replaced my easy chair with a small couch. Now the sound has turned a little too dark/muffled/dead. So I'm thinking maybe if I replaced my speaker cables with some other. Yes, I know it's a long shot, especially when my current cables are Kimber 8TC. But what do you say? Smaller carpet? Just don't say bring back the easy chair or buy new speakers :)