Can I Live With A Hardwood Floor?

Hi All,
I could certainly use some advice on this matter. I have Quad 2905 ESL's in my attic and my attic has hardwood floors. I recently moved into this residence never having experienced hardwood floors previously. My speakers are on cones and isolated with Herbie's titanium gliders. I've been able to position the speakers so that they are given enough room to operate effectively but those hardwood floors are brutal at times. My thought leads me to the only obvious solution, 12 feet by 12 feet carpeting. Are there more cost effective ways of approaching this?
Any advice is greatly appreciated. Thanks as always!