The Modulari Duo Reference combines a Modulari sub-woofer tower with the Modulari Primo two-way mini speaker. Because the 260-pound sub-woofer tower and the 85-pound Primo are crafted out of solid aluminum slabs ranging from 1/2 inch to 1 inch in thickness, they are free of the sonic resonances that plague enclosures made from wood or MDF. The modular construction isolates the Primo's 1-inch Scan Speak ring-radiator tweeter and 7-inch Scan Speak woofer from the intense energy generated within the sub-woofer tower. For home theater installations, additional Primos may be purchased separately to use as center and surround speakers.