Will let you know how the ax-dsp works, just came in mail today with harness. Will install it Saturday, has a 31 band eq and tons of features, 6 outputs. Right now I am only using it to the subwoofer Amp, later may do a Amp since will have 4 more outputs left. But this ax-dsp is plug and play, zero cutting wires, plug in harness, plug in the dsp, run rcas and turn on wire to the subwoofer Amp. Should take me a hour or less to install since I've had the 8.4 radio out several times and know how to remove it. Running 3 jbl gx302 3.5s up front and jbl power series 6x9s in rear doors, still running off stock alpine Amp along with the front doors and headliner. Saturday I may put 6.5s in front doors Have a set of adaptors and harness laying around. The 6.5s are some Kenwood comps I had in my doors of my 5th Gen Camaro, cost like $400 7 years ago, were best at time Kenwood made, but I noticed they say 2,0hm on back, so may work out well. Reading about the ax-dsp it sounds like it sums front and rear to get full range signal. But right now I just want it for bass.