Quote:
Originally Posted by hugo_zair  ...Where, in an electrically isolated capsule, as is the case in a balanced microphone circuit, can current flow? With no current flow, irrespective of the source resitance of each leg, the voltage (to ground) is 48v. Both sides of the capsule surely are at 48v and hence no current can flow through it, and no damage can be done. |
Right. You describe a theoretically ideal situation where phantom power resitors are closely matched and the entire phantom power circuit from preamp to microphone XLR is in good working order (no cable breaks, cable pair resistance imbalance or intermittant connections).
But the caveat against phantom power in ribbon and dynamic microphones is a real world warning - phantom resistors may not be perfectly matched, cable leads may go intermittant, connections may corrode and lead to higher resistance, patch bay connections may introduce conductor pair resistance imbalance etc. So the popular admonition to avoid phantom power with ribbon and moving coil dynamic mics is good advice.
But back to SM-57 mods...
...I'm working on
free mods for the ES-57 and ES-58 copies of the SM-57 and SM-58 mics. The before / after difference in tonal quality is much more pronounced that the popular transformer swap or cut-out mod. And, in the case of the ES-58 the mod is reversable. The mods provide a timbre-balance more closely related to the SM7 sound than the 57 / 58 sound. I'll publish these soon as a holiday gift.