Speaker-level inputs are commonly referred to as high-level inputs. Speaker-level inputs will be used to connect to your factory radio or an aftermarket radio that does not have low-level (RCA) inputs.

Line level inputs, also known as RCA inputs or low-level inputs, use RCA interconnect cables to link the R1002 with the source unit. Most aftermarket radios have multiple pairs of RCA outputs that can connect to multiple amplifiers.

The Variable Input Control allows the amplifier input to match the output signal from the head unit to achieve optimum performance when adjusted properly.