If you want American-made caps, you need to look at Arizona Capacitors who also now owns Plastic capacitors, Inc, based in Chicago. I've used the PCI LQ series as xover capacitors more than once now. On Ebay, there are sources for them fairly inexpensively, whereas you would pay >$100/ea if you bought direct.
I did some digging, and at $28 for a pair shipped of 2uF 2kV (truly) Dupont Mylar^Copyright^/Aluminum Foil/oil-impregnated/bifilar (non-inductively) wound/phenolic-tube-encased/really low ESR and large contact area due to voltage ratings; you cannot get any other Film/Foil 'posh' cap in the USA for less. The lowest I found was a clearanced/sale-priced Jensen PIO/aluminum for about 3 dollars more in cost. When you go back to normal cost, it's about $35 cheaper than the Jensen, and I bought 3x to make value.
Apparently there are some made in Canada as well, but I could not tell you the 'boutique' namesake.
I don't feel the Supreme line is snake oil, as I've not heard a Mundorf I did not like. They are however- overpriced. When you figure the Jantzen Superior and Silver lines are less expensive for basically the same kind of metallized design in a metal tube.
As per my previous lay out of the LQ caps, the equivalent Supreme MKP to the same LQ F/F, actually cost $6 more than the LQ did me, with the Silver Z-Caps being $4 lower than the LQ were.
At full price, I would not seriously entertain their usage, but at the Ebay prices- they are a contender to get F/F at MKP pricing or below.
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BTW- I do not work for Arizona or PCI, and only feel they have great products for these applications.
Later,
Wolf