Audio room floor question

In terms of room acoustics, I've found my current thin+ dense carpet + padding over concrete foundation in my two basement rooms I use for serious listening to be ideal. Bass is mostly what you want it to be, not what the room makes it. That provides a lot of flexibility in terms of overall sound quality + tweaks. I would not want to go back to anything else. Maybe the best + most effective tweak I've ever had.

Don't mean to steal thread however I have a similar situation. Concrete floor currently covered by carpet and pad. Considering covering concrete with plywood floor. Have considered 2 options for this. 1) Lay plywood directly on concrete; 2) Lay plywood over 1 1/2 inch closed cell insulation. Thoughts?

Leave the carpet and pad. Read Mapman's post above. I also have carpet over concrete and it is the best sounding room I could ever ask for.

As with Mapman,Mesch and Rrog my floor is carpet and pad over concrete. The acoustics in this room are exceptionally good IMHO.
Regards,

I use both bottom ported OHM Walsh speakers and rear ported Dynaudio monitors. The thin carpet and pad over concrete floor prevents a lot of bass interaction with the floor, especially with the bottom ports. When I use same speakers on the floor above with typical modern plywood flooring under similar carpet, bass can be overwhelming and harder to get under control.

I've also used front ported B&W P6 floorstanders and Magnepan planars in same rooms. Maggies were the least sensitive to flooring type sound wise for sure, but harder to get clean full extended bass out of. Much less interaction with the floor acoustics it seemed with those.