Terrible Booms

Non finirò di ringraziarvi tutti ... siete indispensabili

@stani19,
I don't think that your room is an issue. But your speaker placement might be. I have a pair is D48R in similarly sized room and don't have any boom. How close are your speakers to the walls on the side and behind? I have them on granite base. My speakers are 70" from back wall and 40" from the side walls. All distances are from wall to face of tweeter.
Now that you have got accustomed to the "scale of music" that these speakers produce, you will be super disappointed by going to a smaller speaker. Experiment with loudspeaker placement and you should find a spot that will take away the boom. Good luck.

in realtà il problema è il pavimento (parquet sospeso). Mi aspetto di trovare punti di appoggio e risoluzione abbastanza solidi. il mio boom non è la loro posizione ma viene dal pavimento (che risuona). tuttavia è abbastanza buono ... aggiornerò la situazione. grazie mille per il tuo contributo

The floor won't resonate problematicaly if the bass waves are controlled.I have a "live" room myself.If the subwoofers(that fire towards the wall) are pulled away from the wall farther than 2 inches the floor and everything else resonates.You can always buy new speakers that don't go low enough to excite the room if that's what you prefer.Personally,I would never be happy only hearing just the upper bass notes.