Very interesting discussion, It amazes me how many different opinions people have about their Altecs and those that have heard Altecs. Altecs Best it suprises me to hear that you think your 604's aren't as fast as your 416's. My experience, is the opposite. My 604's were reconed and remaged at GPA and seem to be much quicker than my 416b's. These also, were tested by GPA and one has one of their new cones, the other which was origanal was fine. Per the previous owner he demanded that the 416's be matched as closely as possible and Bill said that there was no need to replace the old cone to match. I think I will buy a 416 off ebay to see if it helps out the 19's.