The MITUS 121S, 21" large vented bass-reflex subwoofer is the perfect low-frequency extension for the MITUS range and the ideal companion for the MITUS 206L line array for ground stack applications with optional metal base. The FBT MITUS 121S shall meet the following performance criteria, frequency response of 29Hz to 250Hz,frequency sensitivity of 99dB, maximum SPL of 139dB peak, recommended power amplifier 2000W RMS/4 Ohms. The MITUS 121S feature 0.70" Baltic birch plywood construction covered in a scratch resistant black paint with six FBT design aluminum handles. The rear facing input panel provides 2 Neutrik NL4 speakon female connectors.