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Gear / Technical Help => Recording Gear => Topic started by: n3mmr on April 20, 2016, 01:47:58 PM

Title: Dummy xlr microphone plug to use when measuring mic input performance
Post by: n3mmr on April 20, 2016, 01:47:58 PM

What would be the correct xlr-plug-with-passive-components to use as dummy input load when attempting to measure mic preamps performance?

It must be a good simulation of balanced source impedances as well as allow a realistic dc load for testing with phantom power switched on.

Title: Re: Dummy xlr microphone plug to use when measuring mic input performance
Post by: fguidry on April 22, 2016, 03:42:28 AM

150 ohm metal film resistor across the hot pins.

http://benchmarkmedia.com/blogs/application_notes/12139801-measuring-mic-preamp-noise

Fran

Title: Re: Dummy xlr microphone plug to use when measuring mic input performance
Post by: n3mmr on June 23, 2016, 01:42:34 PM

Actually a correct simulation of a cm3/om1 is

22microfarad in series with 50 ohms between 2&3, and about 17.2k, but matched to 0.1%, from 2 & 3 respectively, to 1.