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In Reply to: CAUTION!!!! posted by grhughes on March 1, 2006 at 07:10:34:
Residual phantom power DC will not blow your ribbon. Neither will your ribbon be blown if you hot plug the mic into an input with phantom on. Since a ribbon requires an impedance matching transformer to step-up the voltage, the ribbon itself is transformer isolated from the phantom power. Transformers cannot pass DC, especially DC that appears as a static potential.Of course, there are times when phantom power can blow the ribbon. But this can only happen when there is a condition that would allow that to happen. Shorting either the + or - from the mic to ground would instantly allow current to flow through the secondary of the ribbon's transformer in the presence of phantom power. This instant on current would create a transient across the primary that certainly would cause the ribbon to scream in horror just before it went pop.
Miswired cables and cables in poor condition can contribute to his happening, and running mic inputs through a patchbay can allow it to happen also. When inserting a plug into a jack in a patch bay, there is a moment at which the tip and sleeve are shorted. Instant pop if a ribbon is patched to that channel and phantom power is present.
So, as a rule of thumb, never have phantom on when using a ribbon. But, don't soil yourself if you find that you patched it to a channel that has phantom on. If your input cabling isn't compromised, there will be no damage to your mic.
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Follow Ups
- Re: CAUTION!!!!, BOGUS WARNING - Top Jimmy 12:36:46 03/02/06 (1)
- Re: CAUTION!!!!, BOGUS WARNING - Marantzguy 13:28:14 03/02/06 (0)
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