BOSE 802 Series IV Panaray PA Loudspeaker Full-Range-Driver Array eliminates tweeters and crossovers for unsurpassed reliability in harsh environments and vocal clarity 8x Bose 4.5-inch full-range drivers for legendary reliability 120 x 100 Articulated Array design covers a very wide area, which can reduce the number of loudspeakers required 52 Hz - 15 kHz Frequency Range eliminates need for subwoofers for moderate full-range music levels 123 dB Peak SPL for sound-reinforcement and foreground music