Proac 3.8 or Sonus Faber Cremona

I have the 3.8's and wouldn't consider anything else. I do run tubes.

I'm using the Concentra II with ProAc D15 and have to agree with Keithr on the synergy of the two.

The newer Proac's have a downward firing bass output which makes positioning less of a headache.

Here's what they say on the website.

"Bass loading is achieved through a system which has never been used before in a Response range model. Four large conical feet support each cabinet, allowing the flared equalised ports to couple the bass output efficiently to the floor through the plinths. As a result this driver excels in areas of control, power handling, openness and midrange detail"

I used the 3.8 with ARC VT100 MkIII and loved the result. I ultimately traded them because they don't really open up at apartment listening levels (i.e. they need to be "cranked" before sounding balanced). Their bi-wireing scheme was also not to my liking in that one set of binding posts feed ONLY the tweeter -the other feeds midrange and woofer. I'm used to a tweet-mid on one post and woofer on the other. If these traits aren't a concern, they are great speakers!

The Concentra and the Proac 2.5's or D15's sound great together. But it might help if you share why you want to change speakers. What are you looking for that you don't get with the EAII (which BTW,I also love with the Concentra)?

The principal problem its a lack of bass output efficiency.
Another problem it's when i'm listening to the system during night and i can't go to high in volume then the sound looses only bass output.