I have IsoAcoustics on all my speakers and isolation makes a difference. They work !

I know they put these on the Perlisten s7t le speakers. I'm debating putting them on the reg s7t, but will it kill the bass with the speakers sealed? Also, I read you need a longer thread 1.25 long ordered to use these. Lastly, I was curious if there worth adding to the center specifically the Perlisten S7c, with its stand?