The LSR6328P and LSR6312SP subwoofer are equipped with RMC JBL’s ingenious method of zeroing-out bass problems at mix position caused by room modes. Built-in 1/10th octave parametric equalizer allows to correct problems below 100Hz. The RMC calibration kit gives everything need to identify problematic room modes and tune system. The LSR6325P-1 and LSR6332 enjoy benefits of RMC when used in a system with the LSR6312SP subwoofer.