Housed in a rugged ABS enclosure that results in both light weight and long-term durability, the QSC KLA12 Line Array Powered PA Speaker features a 12-inch low frequency transducer coupled with a 1.75-inch compression driver. Designed to be used exclusively as a fixed arcuate line array, each KLA12 speaker is set at a 90 degree horizontal by 18 degree vertical splay angle, allowing 90 degree vertical coverage arrays to be configured using only five boxes, most other solutions require six! - The QSC KLA12 speaker Ar-Q (Arcuate Equalization) processing enables users to quickly tune the array, making appropriate frequency compensation adjustments based on the number of boxes. With the click of a dial, you can select the total number of boxes deployed in the array resulting in an evenly balanced and accurate tonal curve. QSC's proprietary Intrinsic Correction, first introduced with the Wide - Line Series, actively adjusts time, frequency and amplitude response to achieve a maximally flat bandpass target with the KLA12 speaker. KLA Power Module The QSC KLA12 speaker features a highly efficient 500 watt by 500 watt power amp module. This efficient design enables up to five KLA models, any combination of KLA12 and KLA181, to be driven off of a single 15 amp, 120 volt electrical circuit. KLA12 loudspeakers incorporate QSC's DEEP DSP algorithm - providing extended bass response by actively managing potentially damaging low-frequency transients - and Guard - Rail circuitry protection which prevents the amplifier module from unnatural and destructive clipping. As an energy saving feature, the Auto Standby mode automatically engages after five minutes of inactivity but upon resumption of audio signal, the power module on the KLA12 speaker will awaken instantly for immediate output.