Cheap tweaks...What would YOU reccomend?

Hey everyone, I am looking for some cheap tweaks, i just got done putting in a inner tube under my componets as an isolation device, and it works great. What else would you reccomend?..i am also thinking of an inner tube under the spkrs, with some sort of device to keep them stable. What do you think of Rf blockers..etc Please leave comments on your tweaks and how they turned out. i am looking forward to trying some. Thanks all