this may be another thread altogether, but has anyone done any card spacing?
I did 3' card spacing with km184s at a Phil show in DC, I think it was 4.24.01. TS was more-or-less the back of the floor at DAR Constitution Hall, so pretty far back and I only had cards to work with, no hypers. I really enjoyed the way the tapes came out--nice full, big sound, no hole in the middle, big soundstage. Very good tapes for this far back in a pretty big space with a very high ceiling--especially for cards. I only taped in DAR twice so I'm not too familiar with what to expect from my tapes, but I was quite happy using the 3' spread with cards there.
I ran km184 (a-b, 3')> MV100> Aiwa HDX3000 brick (no AD500e as it had recently died on me at the 3/23 funky Meters show). I also patched into a friend's tlm170 (hc)> AD1000 rig, and my tapes stacked up quite well against his--in fact I preferred mine.
Outside, I'd probably prefer spaced omnis, but if cards are what you have to work with, a spaced set of cards may be worth trying. Again, inside in a larger venue, I probably go for hypers, but if cards are what you have to work with, I think you can get very good sound out of cards if you try a smaller A-B spacing technique.