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Which calibration file do I use when? 4 years 7 months ago #39029

  • Spennis
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I have two questions regarding the choice of calibration file in different situations, i.e. the "standard" vs. the "90 degree" file.

1. The Umik-1 is an "omnidirectional" microphone. I heard someone say that this means that it does not matter how you tilt the mic, it still takes up the same sound. Is this true? If so, why are there two different calibration files? If it is not true, what does it actually mean?

2. When integrating multiple subwoofers in a home theater system, you need to level match the subwoofers. To do that, you need to measure the output equidistant from each sub, and that is most easily done by measuring directly in front of each subwoofer, i.e. with the mic in a horisontal position. However, when measuring the joint output of multiple subwoofers and later on their in room response, the mic should be positioned at the listening position(s), pointed toward the ceiling (i.e. vertically). So now to my question: should I then change the calibration file when doing these different measurements, i.e. use the "standard" file when measuring each subwoofer, and the "90 degree" file when measuring the joint output / in room response?

Thanks in advance.

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Which calibration file do I use when? 4 years 6 months ago #39205

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Yes, it's indeed ominidirectionnal on its patern BUT like any high frequency, it becomes directive at very high frequency (i.e. 15~20kHz).
Great explanation on calibration file here: support.minidsp.com/customer/en/portal/a...-i-point-the-umik-1-

I'd indeed recommend using the 90deg asap you're measuring multiple speakers. For Sub, it doesn't matter to be honest. As explained, the taper (and switch of calibration) is really relevant for HF.

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