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Old 31st January 2011, 05:18 PM   #1
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Default Xlr to laptop mic in

I have a behringer calibration mic which has an xlr output. How do I connect it to my laptop mic in, other than the obvious physical fit issues. Laptop is 3.5 mm jack. Microphone requires phantom power supply.

Oon
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Old 31st January 2011, 05:32 PM   #2
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You will need to get some voltage for the microphone. I would guess around 48 V is appropriate. Supply it via a high value resistor, say 1 Megohm, and you are good to go.
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Old 31st January 2011, 05:37 PM   #3
ra7 is offline ra7  United States
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You will probably also need a mic preamp to amplify the mic output to a suitable level for your computer's soundcard. I have the M-Audio Audio Buddy, which is solidly built and has the 48V phantom power needed for typical measurement mics. There are lots others available also, just search.

Usually, computer sound cards are fairly noisy and so, for measurement, you also want something like the M-Audio Transit to act as an external low-noise soundcard.
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Old 31st January 2011, 07:05 PM   #4
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I don't agree about the level. I think the microphone input on the sound card has plenty of gain.
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Old 31st January 2011, 11:52 PM   #5
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Do you happen to know any links that might show how this connection might be accomplished?

Secondly, I heard that laptop mic input already has a phantom power supply. Can I just use that one?

Thanks,

Oon
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Old 1st February 2011, 12:19 AM   #6
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You just connect hot to hot, ground to ground, and if the input is balanced you ground the other side.

As for power (well it's not really power, just polarizing voltage), some microphones are electret and require no power supply. I don't know what your unit uses so can't guess. But I am sure that, if there is a power supply, it would be a somewhat lower voltage than you would like. Lower voltage means lower output and more distortion.
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Old 2nd February 2011, 01:45 PM   #7
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Most electret mics have a built-in pre amp which is usually powered using the 'polarizing' voltage (phantom power) but some can work off a battery which needs to be fitted inside the mic.
The Behringer ECM8000 requires a supply of between +15-45V to function.
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