Universal Remote Level Bass Control for Car Amplifier Amp Car Audio This is one of the most advanced bass controllers on the market with dual controls. Not only will you get control of your gain but also over your bass frequency. This is great because every song/track sounds completely different (with different frequencies) and its great to be able to maximize your subs output by precisely tuning them at a turn of a the knob. Most radios have crossovers and bass controls built in, but with radio so advanced its hard to be able to access those controls that fast with all thats going on when your driving. So get to it at the touch of a knob. High quality car audio accessories!!!