I've never heard this before...and I would seriously doubt that it's true. I use AT4050s quite often & have hung them right side up, upside down & sideways without hearing any difference in tone. The different positions were merely a product of getting the mic into the right place for the recording.
The reason you see people hang mics upside down in old pictures comes from using old tube mics. They would get hot and engineers began hanging them upside down to keep the heat from the tube in the mic body from wafting up to the capsule & effecting the mic's sound/performance.
HTH.
__________________
-Steve
1927 Martin 00-21
1986 Fender Strat
1987 Ibanez RG560
1988 Fender Fretless J Bass
1991 Washburn HB-35s
1995 Taylor 812ce
1996 Taylor 510c (custom)
1996 Taylor 422-R (Limited Edition)
1997 Taylor 810-WMB (Limited Edition)
1998 Taylor 912c (Custom)
2019 Fender Tele
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