A:AnswerIt's never a good idea to mix and match products. When they create a speaker series they create it as a package. Center, Fronts, Rears, and Sub. Each speaker is created to cover a certain frequency range and they design the package to make sure every fequency will be covered when all of the speakers are together. So by mixing and matching you might be creating an unintended frquency overlap and having your speakers fight for that space or create a frequency gap and you will lose audio in that range.
Now with that said, most people probably wouldnt notice unless you were trying to listen for it. Personally I would notice and it would annoy me.
The bigger issue you are going to have is the sound mapping. Most receivers have a 2 channel setting and a 5.1 channel setting, but not a 3 channel setting. This means than when you hook up your center channel you will most likely have to put your receiver into 5.1 and unless you have the sub and rears hooked up the receiver will be tying to send singal to those sepakers that are not there and you will lose audio. This is somthing a lot more noticable. It will sound like you are getting a lot of vocals and not enough of everything else. There are settings you can mess with on your receiver to minimize this.
At the end of the day its up to you. Sticking with the 2 channel will give you more of a balenced sound. While adding the center channel will give you more sound and vocal capability but might not be as balenced or crisp. My advice is, its more important to have 5.1 than worrying about mix and matching. If you are not an audiophile get he center channel. If you want to have the crispt audio experience where you feel like you are there, save up a little more and buy the rears and sub along with it.
