combak harmonix 909 spike bases

I was hoping to get opinions from audiogon members that have tried these bases for their speakers. I am looking to smooth out the treble and tighten the bass, they will be used on a pair of tyler acoustic speakers. Thanks for your time, Kent
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
I am also considering these...have been told, fwiw, it does have a sound. It does tend to smooth out treble and tighten 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.