Being an “LR” bar, it has two high output left and right channels utilizing an aluminum quad array tweeter with four light weight 5.25” neodymium drivers per channel. The “S” in the model number indicates a built-in subwoofer also using four high power 5.25” neo drivers. SPL5QLRS is designed to be mounted onto a large multiplexed display array, and the 2.1 format makes a great match up to our A2.1 amplifier. The SPL5QLRS has an overall length of 95" and is 6" tall. The SPL5QLRS has a marine finish and is constructed from aircraft grade aluminum.