Wiring for stereo mic using MAX9814
You ought to understand how the chip works as a preamp.
It has variable gain with AGC and attack/decay rates.
https://datasheets.maximintegrated.com/en/ds/MAX9814.pdf
I suggest you should be using STP cable with a grounded shield.
The microphone isolation is more about acoustic pressure isolation and focus than electrical connections.
If the mikes have passive rear cancellation for far field, you will have problems in phasor acoustic measurements even with equalization.