Sonus Faber Venere 2.5 amplifier Recommendation

I had the same problem with my 2.5's. I have carpet over wood suspended floors and had my speakers in a platform that was pierced through the carpet into the wooden floor. I'm a little hard headed and ignored a friend's advice of suspending the speakers instead of anchoring them to the wooden floor. I went to Home Depot and bought two 17" square ceramic tile and layed them on the carpet and put my speakers on them. Wow, what a huge difference that made. All the energy of the speaker was being wicked into the floor and not into the room as music. Bass is deeper and much more controlled. Dynamics went through the roof. Everything was better. 1.5 years until I finally heard my speakers for the first time. So... If you have wooden floors, find a way to suspend you speakers. If you don't... 

I don't know if it will better the sound or not by de-coupling from the concrete. But it will change the sound. I would buy the 6" ceramic tiles and buy some kind of foam or cut some thick carpet to put between the tile and the concrete. Just experiment and you'll find something that works. Good luck.
Dont give up on those speakers. They are very good and will respond to up front changes very well. They have a little bass hump at around 80hz, but it helps with rock.