I used plastic "rebar chairs" from Home Depot supplemented with round sticker foam pads on the bottom, also from Home Depot. I used bubble wrap in the chair seats. It is an inexpensive method to see if it makes a difference. I tried one side and then the other, and noticed some slight improvement.
I also did this for the subwoofer cables on my home theater system and noticed a more distinct difference.
Hope that is helpful.