New Tweek - Has anyone ever tried this?

I have a pretty good system set up in my condo's living room. Like most condo's, the living room opens up into a kitchen/dining room area making it, essentially, one big room. While listening to music and glancing around the room I couldn't help but think that some of the stuff (besides my audio system) may have a negative effect on sound quality. I have a big box full of cables and accessories so I grabbed a bunch of cones (Polycrystal, Black Diamond, and DH Ceramic), and put them underneath things like my toaster oven, microwave, small pieces of furniture; basically anything that I could lift got cones. The end result is that it seems to have very noticeable and positive effect on sound quality. I was wondering if anyone had tried something like this and can confirm my results and possibly improve them. In the mean time, I came up with a couple of new ideas that might work, as well. I will report back any findings. Thanks in advance for any input.