I have a set of these towers and the matching center. I used to run them with a Pioneer VSX-1022 receiver but upgraded to an Onkyo TR-N676. the setup sounds decent but wanted to add some brightness to the higher levels to hear those crisp sparkly details in movies. would replacing the tweeters make a significant difference if I replace in all three speakers? was thinking of using some Goldwood GT-520's from Parts Express unless someone can recommend a better option. thanks for your input.