The KRK KFS-1 is a compact footswitch controller designed for the KRK series subwoofers. Allowing you toggle between ‘full-range’ and ‘bypass’ modes in your studio. The KFS 1 makes it even easier to “A/B” your system. The Bypass feature lets you send the full-range stereo signal to your main KRK Monitors, bypassing the sub entirely, with no plugging or unplugging of cables. Just plug in the KFS-1 latching footswitch to the back panel and switch it to toggle Bypass. Includes the 1/4″ TS cable to connect to your subwoofer. A must-have for any audio professional, musician, or producer wanting to monitor with a subwoofer.