I would like to hear about your experiences with using carpet spikes. I plan to set my SRS-2.3's in my downstairs family room which has a Berber carpet and padding over a concrete floor. I have not heard any speaker enclosure vibrations with my SDA-2's. There is a lot of mixed reviews on carpet spikes all over the web. I was interested to hear some feedback from Polk floorstanding speaker owners. Particuliarly of you have a configuration (carpet over concrete) similiar to mine.