it was dsp with navi. using a jl audio line driver with volume attenuation built in for my ipad to jl 300/4 (no processing or eq yet and works nicely so far). 300/4 is running the front factory mids only for the time being. theres a wiring diagram here in the forum somewhere for the speaker wires color code. i tapped all my speakers from the rear where they used to plug into the factory amp, added some wire and ran that straight to the amp. As far as sub and sub amp goes i will be simply coming off the line driver again to get my signal and then it will have its seperate bass knob up front for a little more control over the system when i dont want it over taking a song. plans are currently to do a single Fi BL 15 subwoofer in a ported enclosure firing up into a new custom floor. The floor i plan to rebuild by making a new one and putting the factory brackets back on it so i loose no space and no function from the factory layout.