I acquired a pair of pre-loved DeVille's, non SQ. I agree with everything Steve Huff mentioned in his review. These speakers are game changers.
They will change the way you listen to music. In my room, 13X28, I experience a holographic soundstage, close your eyes, while the speakers completely disappear and you are treated to a wall of sound with instruments and vocals coming from distinct locations. The aural cues, the space between the notes, the way these speakers render a musical performance is both accurate and beautiful.
The challenge with describing sound is that what we remember most is the way a performance made us feel. Words by analogy are often inadequate, and sound memory is limited. I am a music lover and lifetime audiophile. These speakers are doing something different than anything I have owned or heard.
A truly wonderful music reproduction system will do more than sound great, it will train your brain to hear music differently. Like any great art form, the art, if you are paying attention, teaches us to perceive with greater clarity and perspective. When a home based system affects the way you hear even live music by opening up your mind to new musical spaces and instrumental resonances, then you have something special.
With a deep sense of gratitude.