Due to the UltraSphereT tweeter's HT 40 WS very special capabilities, the crossover frequency point to the cone midrange driver is processed very low at 1.260 Hz. This results in outstanding sound projection capabilities also providing extremely wide radiation angles (+ - > 60° off axis), without significant information loss. Excellent SPL capabilities compared to any other speakers in this class. (Exclusive center mounting-bracket-system included in delivery)