I've decided to build a system for my F150 regular cab and need some help on tweeter locations. I've got a set of MBquart 5 1/4" seperates that I purchased a few years ago and would like to install these in the doors. The stock system staging sounds low to me and I'd like to bring it up to dash level. My thoughts our to mount the woofers in the stock speaker locations and the tweeters in the door where the A-pillar meets the dash. Would I have staging and phase problems since the tweeters will be approximately 20" from the woofers? I've always been told that seperates should me mounted close to each other.