That is how you wire parallel
Impedence in parallel: Rnet = 1/(1/R1 + 1/R2)
If each speaker is 4 ohms then
Rnet = 2 = 1/(1/4 + 1/4)
Here is another good site: www.bcae1.com
Based on the questions you are asking, I might recommend you get some help from a professional or at least a buddy with some wisdom or experience with these issues.