Bass remote

Phoenix Gold ZR6004R - 600W 4-Channel Class-D Amplifier with Bass Remote

Xcelsus Bass Remote

Pyle Stereo Amplifier Audio Receiver with Remote Control - Bluetooth Streaming, MP3/USB/SD/FM Radio, 2.0 Channel HiFi Sound System with RCA/Aux Inputs, Microphone & Headphone Jacks, Adjustable Bass