Like I said, I'm not trying to start an argument.
But you are doing a good job of it.
But cell phone interference is not a matter of balanced vs. unbalanced, its a matter of RF shielding.
I already gave you a couple of clues but you seemed to miss them so let’s put some clarity into the issue.
Cell phone interference is a matter of the low power digital signal from the phone being inductively coupled into the low level audio chain somewhere between the source and the final destination, as such eliminating such interference requires both an understanding of how RF effects that chain and how to design it to prevent such ingress, the majority of which is through the cabling not the microphones.
I don't want someone to go out and buy a prosonus one box or something thinking it will magically fix things, and then wonder if his system is somehow broken because his blackberry is causing noise.
Not a problem if the engineer knows what he is doing and do keep in mind you us dopes in the broadcasting industry have been making microphones work around RF (5 to 50 Kw) for a long time now at RF levels which are oh maybe 1,000 times the output level (.75 watts) of what a mere Blackberry could produce and now with digital radio and TV the problem is multiplied ten-fold yet we manage to get the job done without needing to utilize any form of “shielded” of so called RF resistant microphones. Now that’s something to think about.
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A tad bit more power than a Blackberry eh? Now I will admit it operates at 681MHz which is about 300MHz lower than a Blackberry but with an ERP of 45Kw it transmitts digitally at roughly 60,000 times the power of a Blackberry yet no problem for our audio gear.
Never seen a “shielded” microphone used in broadcasting though we utilize tons of older “non-shielded” microphones on a daily basis with nary a problem with cell phone interference (show me a reporter or talent who doesn’t carry a Blackberry or I-Phone and doesn’t or refuses to turn it off while working on-the-air) and I will buy you lunch
The majority of install mics are now rf shielded; not all pro mics are, and definitely not the consumer/prosumer end.
That might be a good idea until you get a better understanding of RF and how it works beyond what you can Google. Wayne
EDIT: You know what, I'm done. You know better than the people designing the microphones that you're buying. Thats fine. Enjoy.
Do what you love and you will love what you do, that applies to both work and life.