After using or trying many through the years including
symposium, stillpoints, grand prix apex, black diamond, harmonix, & of course a few others. I found all to be good & some better than others.
I would highly recommend checking out the WAVE KINETICS A10-U8 Component Control System & also the WAVE KINETICS 2NS Loudspeaker Interface System. I am experiencing some very good results with better image, soundstage expansion, & Bass was also improved,,, more definition especially in the mid bass frequencies.
They do a great job with both Airborne & Mechanical vibration. The prices are not out of this world compared to a few others
Cheers