As I like ORTF a lot I was cunningly planning to make myself a handy, self-contained unit, mostly for the reasons you stated above.
I came upon Magnusson's and DIY Perks' solutions long time ago but they seem too cumbersome to me.
DIY Perks' hack job is painful to watch ? and while Magnussons' work is good and proper (shielding!) the outcome is still large and cumbersome and the amount of work doesn't translate into compactness. It's only my feeling(!).
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Since the mic has to be dismantled then why not enclose the PCBs in a separate box and have the freedom to position capsules exactly as needed?
Here's the illustration of the idea:
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https://drive.google.com/file/d/1aFRbW-710wc8I24SKNS16ffLtLFbQ2kL/view?usp=drivesdk
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The box is obviously too small for NT1's PCB but I deal with OPIC circuit which fits in, I plan to build 2 separate mic at first and have no larger box at the moment. But you get the idea.
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Aluminium Hammond boxes (or their copies) are great for this and come in various sizes.
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https://drive.google.com/file/d/1aR5222DfDs89NxsWGcSC8mYvCznFt6FC/view?usp=drivesdk
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275x70x45 mm. Capsules in soft 3D printed mounts inside original headbaskets mounted at 110 deg at 17 cm distance fit with room to spare.
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Microphones' PCBs sandwiched inside on common motherboard standoffs:
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https://drive.google.com/file/d/1aUM_UPkMXWLYYr8vKYLoxDXVdRcXwy66/view?usp=drivesdk
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And one can use individual furry windshields for moderate winds or build smalker, individual blimps for stronger winds.
Sure, there's a question of elastic suspension (handling noise) but since I use a tripod anyway it wasn't a concern for me. One can fashion a "noise cancelling handle" for this.?
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