In PCB design I every time feel fear in my power trace included high impedance section or not? I've shocked on about 6k resistance putted on +48v of phantom power. I've heard this large resistor is just exist to prevent short circuit or misswiring disaster. What if voltage source be short-circuit/over-heat protected? Then:
The only reasonable problem caused by low impedance supply is to kill audio signal, in other word it imposes high load to MIC. Then why not replace resistor with inductor?
If phantom power can supply MIC and it's preamps well then including resistanced in power supply line must not be a catastroph, but really can prevent catastroph (ie. IC breaking and becomming short circuit). Then is there any rule to include resistor in our circuit design without any performance loss of supplied circuits?
Is it inevitable that by using phantom power mixer input impedance have to degrade to 3k? Why this shoud be just CM load and not the diff load, if it is?