About MicIRP

During my years as a microphone technician, I have recorded many frequency response plots of vintage mics, and I have been asked on several occasions to share the data. So here it is.

The analysis software, Fuzzmeasure, has the facility to export the data as impulse-response files.  These may be useful as sound effects or filters for processing tracks during mixing, or simply to hear how the microphones sound.

The picture below shows an RCA 44BX under typical test conditions. The mics were tested using a swept-sine method in a smallish booth, treated with much acoustic foam, placed about 20 to 30 cm from the source. 

Although the recording system and booth are calibrated regularly with a Beyerdynamic measurement mic, there are problems comparing, for example, a figure-8 ribbon with an omnidirectional standard, as they will see different amounts of reflections from the side. So, it should be noted that the impulse-response files describe the the mics measured in the booth, rather than in free space.

The IR files are tagged by manufacturer, and for each mic there is (usually) a photograph, the impulse-response file and sometimes a frequency response chart.

The IR files are shared under Creative Commons, which means that you can use them as you wish, but please give a credit and a link to MicIRP & Xaudia.com.

As this is a free resource, I do not provide technical support. You may hire my services through Xaudia.com.

You may post comments but note that any comments with links will be marked as spam and deleted.

If you find the files useful, then that's great.

Updated February 2017

Creative Commons Licence