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I just got done making some homemade coupling/decoupling pads for my new Klipsch RF-7ii's. As I have slightly uneven and hollow tile floors over concrete (which has caused sonic issues with all of my floorstanders in the past), this is an upgrade I have been very curious about trying. To start, I cut 1.5" thick granite plinths, then fitted natural cork feet and a thick layer of blue-tack to decouple the granite and from the floor. I then built new bases for the speakers out of 3/4" MDF, adding coupling spikes to all four corners. My goal was not to isolate the speakers from the floor, but to strike a balance between coupling and decoupling, reducing or eliminating unwanted reverberations from the floor, while providing enough cabinet stability to reduce extraneous cabinet movement. I tried to be as objective as possible (while still being completely lazy), so I did some before / during / after listening to a handful of tracks that I use for reference listening. No mics / spectrometers used, only my ears. Upon first impression: improved mid range definition and tightness in the bass. When listening with only one speaker stand done, I noticed that the imaging pulled toward that speaker (without calling attention to the speaker itself). To be sure, I adjusted the MLP to account for the increased height of the stands, and noticed no difference in the sound. Especially at loud (over reference) volumes, I have noticed that certain tracks that we're previously harsh in my (very lively) room are much more tolerable, even for extended listening periods. Overall, I am quite pleased with the results so far! Pictures attached for anyone interested.
