just put in a new hu, remove processor?

When I got my Max, it had some JVC HU in it, but I decided to run it until I got some other stuff squared away w/ the car so I left it in there. I recently got an Alpine CDA-9831 off a friend of mine who needed some cash, so I got it REAL cheap. To add some adjustability to my system, I got one of the Precision Power PPI DCX-730's a few months ago, and that helped alot b/c the JVC had some pretty puccy a5s pre-out voltage(and only 1 set) and virtually no adjustability when it came to shaping the sound. Well supposedly the Alpine has got mucho adjustability built right into the HU, and it already has pretty decent pre-out voltage and 3 pre-outs, so I do not really think I need the processor any more.I guess my question is:Is it better to make your sound adjustments at the furthest point upstream possible(read: HU), or would it be better to give a flat signal to the processor and let it do the shaping work?EDIT: I have got Alpine 2 ways in the front doors w/ factory tweets hooked up powered by 600w MA Audio HARDKORE 2ch, Pioneer 3 way's in the rear deck ran off head unit, and 2 Earthquake 12's in a custom ported box powered by a 1600w mono amp

 

This is all in a 1997 (4th gen) Nissan Maxima

 

Thanks in advance,

-Matt