I do not feel you get the full dynamics and soundstage with speakers 'floating' on the carpet. You may need to experiment with different types of spikes or cones to find the right match. There are numerous entries in this forum on the topic, you can even search by your speaker type. I use Walker Valid Points which are placed on Walker dics. I have cut out the carpeting for the dics for direct contact to the floor... for which me and my sound room have been banished to the basement! The WAF ( wife acceptance factor) should be considered in the interest or marital harmony before you begin cutting up the carpeting.
Why Anchor Speakers?
Since we're on the subject of vibration tweakage, should speakers be anchored to the floor? If so, why? My speakers are on stands which rest on carpet, and I am considering spikes which will anchor the bottom of the stands through the carpet to the flooring. Should I do this? What should I expect to hear differently?