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Originally Posted by boojum  OK, here is where I am with the pursuit of the Snark, err, I mean Jecklin. LP record covered with 1/4" foam on each side and then covered with faux lambs wool. It is about 1.5 inches thick or 3.8cm.
I used the 4006 TL's with the trapezoid grids to roll of the highs at ~12 - 15KHz, the DD0254 rather than the diffuse grid, the DD0297. I am doing this because I am going to be right above the chorale director's podium (textbook placement) and the chorale's sopranos are not all smooth. So, DPA fixes this for me. I tried it at a lower height and the sound was good but not enough "room" so it is going back to the textbook height.
A work in progress.. |
I went back to the Jecklin document and couldn't find any direct references to mic height or placement, apart from suggestions that it's easier to place than A-B omnis or ORTF cardioids, so I'm curious about which 'textbook' you're drawing upon here ?
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Originally Posted by boojum NB - The paper which describes the 35cm placement of the mics also shows the mics to be parallel to each other and the disc, not angled outward with the diaphragms at the desired distance as in the 17cm arrangement. |
I wondered about this also, as his diagram clearly shows a pair of omni mics pointing straight ahead with the baffle between them at 36 cms spacing, but can anyone translate his final sentence, which reads:
"Der Oeffnungswinkel beträgt rund 60° (Grund: Ueberhöhung des Frequenzgangs in der Mikrofonachse)" .... ???
In response to my own question about the alignment of the mic pair off-disc centre, I'm unsure whether Jecklin would have modified his 36 cm width instructions, compared with the 17cm spacing version, which states ". Take care that the microphone capsules on both sides are located at a distance of approx 8 cm directly above the disc center. " (copied from the Josephson site).... ???
Feeling like an archaelogist, and the inventor is still with us, as far as I know......
