I've gotten the impression from some of the things OMA has said that the design brief was for a fun, decor-friendly speaker that played bigger than it looked (though it's bigger in IRL than in the pics I've seen...), as suitable for hanging out as for "audiophile" listening. I've had mine exclusively in 14x19 room but will eventually haul them into larger room to hear how they do in space. I've found them listenable with every type of music I've tried. Right now using them to break in an Absolare hybrid stereo amp -- sounding great.
Had to laugh at a Dagogo review
Aspen Acoustics Lagrange L5 MKII ribbon dipole speaker system - Dagogo
about an obscure one-man garage operation wherein, after an endless technical deep dive into the subject speakers, Schroeder decided he needed to bash the DeVilles based purely on specs -- admitting he's never heard them. I tried to post a comment but for some reason it didn't take ...
Parker