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May 18th, 2006, 07:50 PM | #1 |
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Question about "phantom"
Does phantom power, by definition, mean a supplied voltage in the 11 - 48 V range?
When I put a 1.5V battery in my AT897 to power it (when using a Sennheiser 100G2 xmitter), is this not "phantom" power, even though it is powering the mic. Finally, my Senn 100G2 receiver does not supply phantom power, but the supplied lav with mini connector still "works". How does it work if there is no phantom power? Is there a lower voltage supplied at the mini connector input that powers the lav? |
May 18th, 2006, 09:33 PM | #2 |
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The term Phantom power is used for powering the mic from an external power source via the standard 3-wire mic cable, The power is 9 - 48v very low current according to the mic specs.
1.5v internal batt. is not phantom power. Most WL transmitters supplies 1.5v-5v power to the electret condenser lavalier capsules, You can call it " Baby Phantom" if you like. Danny.
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May 18th, 2006, 11:00 PM | #3 |
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My turn, is there an advantage to phantom power? Other then not having the battery on the mic of course.
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May 18th, 2006, 11:09 PM | #4 |
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Phatom power is better. It is constant, Batt. is not. It is safer, Batt runs out
some time. If you look at mics specs. you will see better performance with Phantom in mic that can be powered by int. batt. or phantom. Quiz: Why "Phantom" ? Danny.
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May 19th, 2006, 04:41 AM | #5 | |
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No, the battery in your AT is not "phantom" power - phantom is fed over the XLR connector from the mixer or whatever the mic is plugged into. Your Senn receiver doesn't supply phantom but transmitter does supply the power the attached lav mic. It's not really "phantom" power in that the spec for phantom defines not only the voltage level but also which pins carry the voltage. The phantom spec says that XLR pins 2 and 3 are each at +48vdc with respect to pin 1. FYI, the Sennheiser 500 series plugon transmitter does, in fact, supply true phantom power to the mic it's plugged into.
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May 19th, 2006, 04:42 AM | #6 | |
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May 19th, 2006, 04:45 AM | #7 |
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Why is it called "Phantom Power"?
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May 19th, 2006, 06:37 AM | #8 | |
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May 19th, 2006, 07:09 AM | #9 |
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Thanks so much for these explanations. I finally understand!!
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May 19th, 2006, 11:33 AM | #10 | |
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Quote:
When I was a lad working at the college radio station we would go out remote location and send the audio back to the studio over balanced phone line circuits. We had handsets connected between the center taps of the transformers and earth at each end so the studio guy and field guy could talk to each other over the same line that was carrying the program. This is another example of a phantom circuit in which the earth carried the phantom signal in one direction and the phone line pair carried it in the other. This is really what we have here. The phantom cirucuit carries the DC power to the mic. |
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May 19th, 2006, 12:54 PM | #11 |
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Check out some of the related threads on this topic:
Dynamic mics immune to phantom power? http://www.dvinfo.net/conf/showthread.php?t=67611 phantom or no phantom? http://www.dvinfo.net/conf/showthread.php?t=67672 ME66 need K6 with Beachtek? http://www.dvinfo.net/conf/showthread.php?t=9064
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