Sonic beauty is always an attribute of the world’s best audiophile equipment, which rarely possesses similarly appealing visual aesthetics. Indeed, when not the focal points of a room design, massive power amplifiers and winding cables can be very unsightly to non-hobbyist music lovers. Realizing this, the Parisian company Devialet set out to connect impeccable audio engineering with the wider audience of both audiophiles and causal listeners. The company’s new Devialet 240 ($17,495), Devialet 170 ($9,495), an…