Universal RCA Bass Gain Control Knob

A compact, dash-mountable RCA volume and bass gain control knob designed for straightforward integration into car and home amplifier systems. It fits standard 4.5 cm mounting hole spacing, allowing secure placement under or inside the dashboard. Equipped with two RCA input ports and two RCA output ports, it supports direct signal pass-through without splicing or additional cabling. Built from a combination of black plastic and metal, it includes an 18 cm integrated wire for tidy routing. Supplied with one controller unit and two mounting screws. Optimised for users who require precise, hands-on adjustment of amplifier output level — particularly beneficial in multi-amplifier setups or when fine-tuning subwoofer response.