Those can produce obscenely loud and deep bass with a lot of pressure. I remember a demo of these with the NAIM statement at the hifi news show and they had to mound a load of conference chairs against the rear fire door in a huge conference room when they played dance tracks - basically the bass pressure kept blowing the fire door open lol.
Funnily enough, I think those Naim statement amps that the Grandes (& Stellas) were demonstrated with, to trade and public, are the reason the big Utopias are not as highly regarded as they deserve.
I've had three dealers visit here separately who all attended the Focal - Naim training events organised by JM Lab, and they arrived with low expectations of the Stella's abilities. And a vanload of alternative speakers for me to try, in one instance
All were surprised at the contrast from how they remembered them. All concluded that the Naim statement amps were a poor match, combining with the Utopias for a bright and edgy presentation. This is not how they sound here....the Wavac Boulder combo lets their inherent musicality shine with an engaging, unfatiguing and slightly sweet character
None of the alternate speakers made it out of the van The guy thought the JBL K2's would do it for me, but when he heard the Stellas, he saved himself the effort of unloading them.
He tried to tempt me with a Vitus Masterpiece pre amp, but without the Wavac the soul was gone. Even a Boulder 2110 pre amp reduced the pleasure factor, but did add more awesomeness.
I apologise for sounding a bit up myself....pride is a sin indeed
But hopefully you will understand, my brothers