Kicker's ZXRC Remote Bass Control lets you adjust the level of your Kicker amplifier from the front seat, so you can keep the thumping under control, or turn it up to 11 when you want to show off. When you activate the amp's low-pass filter for a subwoofer, the ZXRC takes control over the the amp's volume, so you can make fingertip adjustments to your sub's level.
The ZXRC remote works with any Kicker IX, ZX, DX, or ZXM amplifier with a remote control jack. (Some of these already come with a ZXRC remote, so you can use this remote as a replacement for a lost or broken one.) The ZXRC will only control the rear channels of 4-channel amps.