The JBL's LSR4312SP is a 12-inch powered subwoofer from JBL's LSR4300 series. This powered speaker provides accurate and precise low-end reproduction all the way down to 27Hz, making it ideal for applications in professional music, broadcasting, and post production. The subwoofer, which is powered by a 450W amplifier, has sufficient of punch to pound out everything you put at it. The LSR4312SP contains various innovative technologies, including Room Mode Correction, HiQnet networking, and a Linear Spatial Reference design, in addition to high-quality JBL audio. Room Mode Correction (RMC) technology evaluates the room's frequency response and inserts filters precisely to adjust for low-frequency errors. This eliminates guesswork and creates dependable mixes in any situation by ensuring that signals arrive at mix position with the intended frequency response.