Please ask any and all questions before purchasing!Bass KnobThe Bass Control is a remote volume control for amplifiers. Its main purpose is to control Subwoofer volume in a practical way and in real time, as it can be fixed on the vehicle’s dashboard for easy access. With RCA audio inputs and outputs, it can be used with all models of head units and amplifiers with this type of connection. This is Taramps putting you in control.MD 1200.1 1 OhmThe Taramps MD 1200 in the 1-ohm version has been carefully designed with the highest technology, offering high efficiency and performance for various types of car audio systems. This amplifier covers the whole frequency range, that is, it is a FULL RANGE module. It is classified as mono and has a channel with a maximum power of 1200-Watts RMS.