Tuning, Great Oden’s Raven!

Hello to all, I just installed my new head unit today and have a couple of questions about properly tuning my system. The equipment in question is as follows: Head Unit: Eclipse CD8454 Components: Jl XR-650 CSi Rear Speakers: Diamond Audio M391i Subwoofer: Brahma 15" Four-Channel: Jl 300/4 Monoblock: Jl 1000/1 1) Should the filters for the 300/4 (rear and front) and the 1000/1 (Amp LP Filter) be set to "Off" so I can just use the head unit for tuning? 2) For the components, will I even use the crossovers or will I use the head unit? 3) The 1000/1 has a "Preamp Output Section"; should this be switched to full range, amp filter or out filter? 4) Using a sealed enclosure, will I use the "Infrasonic Filter" or leave it turned off? Thanks to any patient people who can shed light on these topics.   

Thanks, Stevdart. Bonus points for replying so fast... I'll make use of the Eclipse deck and turn off the filters; I need to justify my investment! One point to clarify:    will using the component crossovers mean I don't use them on the head unit? (I understand you can do the same thing through the 8454)

Correct.  The deck will be sending a full range signal.Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.