You can go with different rear speaker's, but you want to have at least the three front's should be timbre matched. All my speaker's are timbre matched, but my subwoofer's are a from a different company. The Advent's are all from the same speaker line, so the tweeter's are similiar and so are the woofer's even though they are different size's. The Advent's work great together, very smooth sound and were used originally with a Pro-logic Sony reciever, then a Sony DD reciever.