EIDOLON, from the Platonic conception of idealised shapes; the embodiment of perfection that exists beyond our level of perception The Diamond has patented conductors formed with ultra pure copper created specifically to connect the controller and the crossover within the bandwidth of each circuit. The tweeter is composed of the first man-made diamond diaphragm. These are grown in a hydrogen plasma sphere bombarded by high energy electrons. Each is produced in very limited quantities, for a period of 48 hours. After each small production, all machinery must be recalibrated in preparation for the next production run. The PREMIUM finish is a gem of wood treatment. Only for purists who know how to appreciate the work done by professionals. 3/4" Pure Diamond Tweeter 3 1/2" Concave Ceramic Dome Midrange 11" Woofer by Nomex Kevlar Sensitivity: 87 dB Impedance: 4 Ohms Nominal Frequency Response: 24Hz to 70kHz Recommended Amplifier Power: 50 to 500 Watts Dimensions: 43 ½" (110 cm) High 12" (30 cm) Wide 17" (43 cm) Deep Weight: 68 kg unit