Looking to do a system in this car. Not looking to replace the factory speakers, (two sets of Dynaudio comps). Want to keep the factory HU and bypass the factory DSP/Amplifier. I also want to add a sub. What I am looking for is an aftermarket DSP, (BitOne, 360, etc.) that will allow me to actively crossover and T/A the factory drivers and add a sub. Will be using either Arc, JL Audio or Zuki amps. Just don't know which DSP to use and may also need a competent installer in the SE Michigan area.