When you unplug the factory tweeter, the capacitor (black plastic covered thing) comes off with the tweeter leads. Once the tweeter is unplugged, you can use either of the wires in the door for new speakers b/c they are the exact same. Like Custom88 said, you need a component speaker system that comes with a seperate tweeter, midrange, and crossover. OR if you have a crossover for the new tweeter, you can just wire it up the way the factory did, with the cap on the tweeter lead. Personally, you are better off buying a matched component set, and get rid of the factory speakers completely.
"-@--------@--" 1990 SSE " Black Ice " 220,000+ kms, GX3, sunroof
16" Streetwear Diablo wheels | Blazer Fog Lamps | Silverstar 9005 low beams | Mesh Grille | STB | '94 Top end | Delco Type 2 Ignition | Blue interior LEDs | LED 3rd brake light | Auto-dimming rear view mirror | Pioneer DEH-P7600MP | Rockford 5 1/4 Components and 6x9s
Daily driver : '95 Buick Regal Custom | Blue under dash LEDs | Infinity 5 1/4 components | 8 Inch sub under dash | 12 inch Bazooka sub in trunk | Rockford 4 ch amp | Trunk mounted EQ | Pulsing trunk LEDs