I agree with Spinaker in that the seamless intregration across the front 3 speakers is a priority in HT setup. However the C30 is from the predessor to the Performa F32/C32/M22 line up. The C12 is from the Concerta line up.
To find the rears that match with the C30 and F30 I believe that those were the S30 which were a di-pole design.
To find the rears that match with the C30 and F30 I believe that those were the S30 which were a di-pole design.