The limit is the acceptable HF loss.
For a nominal mic output Z of 200Ohms* the response will be 3dB down at 20kHz for a capacitive load of ~40nF.
If we have a worsecase cable capacitance of 200pf/mtr (and Canare starquad was just 162pf/mtr) that gives a maximum run of 200mtr.
But, many mics never get to 20kHz, certainly no dynamics of my aquaintance and in practice if you needed to drive 500mtrs of starquad you would use a high quality pre amp with a <50Ohm op Z!
*I know across the Pond the standard mic Z is 150R which gives you a bit more "reach" but in practice, never gonna tell.
Dave.
thanks for the reply!..
the stunt (so to speak..LOL)..I`m looking to pull of, is going to require roughly 50-75ft of MIC cable..I`d be using a spirit folio 6 channel mixer 48V phantom power..their will only be the one mic..nothing else hooked to the board etc...my cables are`nt absolute top of the line, but they are almost brand new and in really good condition..hopfully they`ll pull it off..
I wouldn't worry. 75 feet won't be any problem at all.
FYI, my STANDARD run in my home studio is 30 metres/100 feet, simply because that's my shortest multicore and it's easier to use that rather than a bunch of separate mic cables. My set up involves one spare bedroom as my control room and another spare bedroom (across and just up the hallway) as the "studio". The actual run could easily be handled by 10 metre cables but it's just easier with the multicore since I have to strip everything out at the end of every session.
How many spare bedrooms have you got there Bobbsy? Does your wife had a spare bedroom or two for her hobbies as well, or have you snagged them all?