can i only get a new 2 way speaker? I'm replacing all the speakers in my '96 jeep grand cherokee Limited gold. Before purchasing all the new speakers, i need to know what all i can get. the jeep currently has all 2-way infinity gold speakers. I want to know if i can replace those with 3 or maybe 4 way speakers or am i only able to use 2 way speakers in the vehicle.