Hi Norris,I suspect there are a lot of things in various stores that would make good phase plugs. Model rocket nose cones come to mind. Right now, I'm looking for things that will work for a 2 inch voice coil. Sometime in the future I'm going shopping for a tweeter that will fit on a short piece of PVC pipe that is efficient enough to keep up with my EV's. I'll cross them high. Then I'll have coaxials and won't worry about phase plugs anymore. ![](http://www.audioroundtable.com/emoticons/winkie.gif)
Dave ![](http://www.audioroundtable.com/emoticons/smiley.gif)