I have the 999 spike base under my Avantgarde Omega Duos. Made them sound much more like music und less hi-hi. Very expensive though
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I am also considering these...have been told, fwiw, it does have a sound. It does tend to smooth out treble and tighten bass...in the treble, upper mid, have been told slightly less 'neutral' effect than Wave Kinetics N2S.
Sorry - this is all hearsay/feedback from people who own/use either...and in one case, someone who has compared them. Hope that is helpful. good luck.