Listen to all your music on the go with GoMechanic TAURUS-T1 with premium quality 3200W with crystal clear Low-Frequency response bass tube. These have a rigidly-constructed woofer for tight, punchy bass, enjoy the deep depth of sound with high power handling. Add one of the latest GoMechanic Mega Bass head unit for more sonic power, clear sound and enhancement sound. Left Sockets- Input Sound Gain Knob - For Bass Improvement Filter- Bass Frequency Filter Switch- For Low Frequency (BASS)/Full Frequency output Positive-Positive voltage REM-Input for Turning On/off Bass Tube Negative-Negative Voltage