JL Audio HD-RLC リモートバスレベルコントロール（HD XD MHD Mシリーズアンプ対応）

Was looking for a way to dial in my subwoofer level from the driver's seat, and this little knob is perfect. The cable is long enough to route cleanly under the dash, and the smooth turn knob makes adjustments effortless without any static.

Installed this in my car yesterday and the 20-foot cable was more than enough to route it cleanly under the seat. The remote itself feels solid, and now I can quickly turn the bass down when I hit a neighborhood.

The wiring harness is long enough to reach from my trunk up to the front seat, and hooking it into the amp was a straightforward five-minute job. Fiddling with the bass knob right from the driver's seat makes adjusting the low end on the fly so much easier than I expected.