The Auralex platforms under my Velodyne HGS-15 and HGS-10 really improved the tightness and extension of the bass. This improvement was especially noticeable with the HGS-15. I've wondered about putting them under my KEF Reference 104.2s as well, but they cross over to the HGS-15 at 80 Hz, so I doubt there would be any benefit.
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