"Fine tunes the volume of any RCA line level signal. Compact housing allows the unit to be mounted virtually anywhere so control is at the user’s fingertips. Simple in and out connections, no additional wiring needed. Great for a sub amp volume control"
nothing is going to control the bass on the radio. if you want to control the sub output (which is bass) then yes it will control the bass. if you want it to control the bass levels the radio produces you need a sound processor for that. what is "your" definition of bass? and how do "you" want to control it?