I have subbed the 1-pi with different ribbons and domes and bose with the higher spl rating and none sounded as good as the DX 25s ,I tried the Vifas last and what i found out is that I wasted around three or four hundred dollars. DX 25s sound better and blend better than all the rest,including the Emits the polydomes three different ones, the daytons ribbons, and some high price ribbons, three different bose tweeters . OK the Dx-25 surprised me. Hey Wayne P. is the Heil AMT tweeter a good alternate ???