U-ART 1.9' Accelerated Ribbon Tweeter The air velocity ratio of 4:1 during the sound generation by folded U-ART membrane HPS waveguide from the S Series Lightweight polypropylene construction of the woofer Vertical 2-way system with 8' woofer Spacious rear-firing bass reflex port Linear frequency response of 33 Hz to 25 kHz Maximum peak sound pressure per pair in 1 m >= 118 dB DSP-powered crossover design Simple room acoustic adjustments via high- and low-shelf filters Analog inputs over XLR and RCA Acoustically optimized cabinet geometry