Hello, I'm new to this forum but not new to car audio. I had a great system 10yrs ago with JL Audio 13w7 on a 1000/1 and two pairs of Infinty Kappa's on a 300/4. Anyway, I haven't had a system in years but have been fantasizing about another system but this time, one for the records, lol. This one will include complex wiring and custom mounted speakers and added speakers for a near perfect sound stage. I was told having a center speaker was almost mandatory for a SQ sound system. I got to thinking while taking on a very ambitious project of sound deadening the firewall and doing sound blocking and deadening while I had everything off and rebuilding HVAC system inside my vehicle. I'm in this section to find out what would be the best range speaker and size for a IASCA competing build? I have my own opinions but would love some ideas and clarity on the subject. Vehicle in mention is a 1999 Ford Expedition and doesn't come with a factory dash speaker location.