thanks everyone
the rotary switches are encapsulated standard parts for about 3 EUR per piece with contacts made of brass and silver afaik. I didn't want to spend 100 EUR on Elma switches. Cable is silver plated copper interconnect from van den Hul, though I doubt the 10 EUR are worth the difference.
The crossfeed is the modified Linkwitz crossfeed fom tangent in silent and high-Z configuration.
My cam is already stored in my luggage, I'll take detailed shots from the switches and wiring when I'm back in about 2 weeks.
I rushed the design out of a mood and didn't take a night to sleep over it. Therefore I overlooked one flaw: I should have placed the crossfeed between input and output, coupled with a switch to bypass it. On such a configuration the crossfeed could be applied to every output and not to output-5 only. Next time I'll think twice.
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