These speakers are based on Paul Carmody's Tarkus Undefinition design, but in a single, curved enclosure rather than the two-part of the original design. The woofer is in a ported enclosed; the midrange and tweeter are in internal individually sealed enclosures. I modelled the box volumes, the speaker drivers and crossovers for a fairly flat response right down to below 40Hz. I've since fitted removable black front covers for a more traditional 'living room friendly' look!