Thank you,balddrick.you are right,i plan to use S4700 as main spearkers,but S4700 is too big to put in the center,and the dealer wouldn't sell a singel S4700 to me.You can have a look at my signature picture,i used 4628B as hifi speakers before, 4628B is almost the same as your 4730A,only the woofer is different,but i sold them:o: