I currently have 4" coaxial speakers in my car and am looking to upgrade. I was thinking maybe something like the CDT Cl-641 3-way components. Right now, I have the coaxial speakers mounted in the dash in the stock location. I'm wondering how the setup would sound if I mounted the tweeter and the midrange in the dash, and the midbass on the bottom of the door pannel near the front. Someone in a local store told me that any components had to be mounted right next to eachother to sound good. Is this true? thanks.