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The iQ2 is the centre designed to be used with the iQ5's. The iQ6c will far outperform an iQ2c, and improve your system further if you can pick one up. Because of their UniQ design, either will work well with your existing speakers.
In terms drivers used both IQ2c and IQ6c use the same drivers as the IQ5's, but these last are 3way.....so the best match (theoretical)should be the IQ6c because the IQ2c are (obviously 2way design).
I own a pair of IQ5's and recently add a chance to get a good price on a IQ2c, but i didn't......still waiting on a good deal for the IQ6c. Let's just say that the IQ2c seems a little "cheap".....so to speak. But that's just me.....