...the tidal speakers ..the whole line..is in a class by itself...having just heard the piano cera at the axpona show in jacksonville,fla ..thursday and friday...it was the best sounding speaker there...no doubt about it and by far..the most emotionally involving speaker i have ever heard...almost everyone who came into the room thought likewise..i have heard the aerial 20ts and there is no comparison..i will be buying a pair of the contriva diacera -se's later on this year..