NYDiplomat

I'm a total newb to car audio and I want get into tuning my system a bit more. I got the DD-1 today and now I'm making sure I can put my headunit settings to flat or off. I'm able to so but Im not able to do it for the LPF on the Band Pass Filter setting. The lowest I can go is 50Hz and the Highest is 120Hz. So my question is where should I put it when I'm looking for the max clean output? Here's a pic just in case I'm explaining myself wrong.

What's going to be the finished length and height of the VU-Din?

A day late to the party but I still put in a order. Fingers crossed for the upgraded shipping (Order# 100001956)