It's a Mazda3 sGT. The OEM Bose system runs through the amp which is located under the passenger seat. Clean, low-level signals are under that seat and can be used to feed the DSP and then AMP. Speaker wires will not be changed until the new speakers go in. Basic power kit for amp will provide new power line. RCA's will be used to transfer signals from current AMP input to new dsp, and RCA's will also connect dsp to amp.