Originally Posted by
gdmoore28
I think you are on a good path with your plans. A single horn with the newly reconed 416s will yield great results. Your primary concern is going to be building a good crossover network. I'm sure others will chime in with recommendations, but the one addition that I made to my crossover that made the most improvement was the incorporation of the Altec 30923 horn eq/attenuation network. This simple network (three resistors and one capacitor) is inserted between the hi frequency output of the crossover and the compression driver, and removes about 6-8 decibels of the mid-frequency peak that makes the 802 (and most other drivers of the era) sound "honky." The difference is literally day and night.
If you decide to build one of the "Z-19" crossover variants, you will not need the 30923, as an adjustable version of it is part of the crossover.
Finally, I've used POR-15 on various auto restoration projects since the late 1970s. It's a great product. But I don't think it will produce one ounce of damping for the horn. This is because POR-15 produces a relatively thin coating that is rock-hard and almost becomes part of the horn itself. It will make the horn casting a little bit thicker, for sure, but I'm quite sure that the only result is that the horn will simply ring at a different frequency - but it will still ring.
Others will likely add to the thoughts on this subject, but my personal experience with using the 802/511 combo in a home speaker system leads me to believe that the ringing is simply not an issue worth devoting much time or money. Just make sure that the horn is solidly mounted in the cabinet and you will be home free.
GeeDeeEmm