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serenechaos wrote:

If you know a source of inexpensive permendur, I'd sure like to know about it.  I'll build some drivers, but they won't be full range...

I do not remember now the numbers exactly. At the time what I was thinking to experiment with my Quartopuss driver:

http://www.goodsoundclub.com/GetPost.aspx?PostID=3151

…I was researching this subject. At that time I found that permendur was expensive for me as I was just experimenting with it not rendering any defined final version. Still, it was not true astronomical if I desed to pursue it. Also, my machine shop told me that it is not problem to machine permendur, in fact I consulted with a number of machinists. The whole project was around 1.5-2 times more expensive to round in permendur then with any more common core. So, it was nothing too dramatic.

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