Volleyguy,
You should see the comment I made about the passive / active solutions in the context that many active filters in car stereo are DSP based, something I don't consider ideal.
I've heard both passive and active systems featuring Duelund components, both types have sounded great to me.
Regarding your statement about the vintage part of the Duelund design I agree completely. One would do well to remember, that the shift from metalfilm caps in paper and oil or wax to what we have today in the metallized designs, did not happen because of the quality in sound reproduction, but because they are smaller and cheaper to manufacture. As I see it, the Duelund caps are in effect good well proven tech taken bang into the 21st century.