Recording - March 2018 - 45

Generally I set the sound levels in the
room to be about 80 dB SPL, and then set
the mic gain so the peak is between -10
and -20 dBFS, but there is a lot of leeway
here. REW will tell you if the levels are
inadequate, and you can always fine tune
them later after a measurement or two.

1

A WORD ABOUT MICS

Now it's time to close your beloved
mic locker and reach for a measurement
mic, an omni with very flat frequency
response. You can get one for under
$100; there are even USB ones that let
you skip a preamp. Omni mics are best
because directionality impacts our ability
to measure the entire room accurately.
We can also calibrate for the mic's
response, similarly to how we can calibrate for the soundcard's response as explained above. If your measurement mic
has a calibration file, you can load it in
the Mic/Meter tab (next to the 'Soundcard' tab in the preferences window).
It's important to realize that we cannot
actually measure our room's response;

instead, we can measure the response
at one point in the room at any given
time. As soon as we move the microphone, even a few inches, we will get
an entirely different response curve,
especially at higher frequencies. For
most measurements, we are interested
in the listening position, so we put the
microphone's diaphragm exactly in the

middle of where our head is when we
are listening to our system.
Sometimes it makes sense to get measurements from several different points,
especially if we are considering where
to put the listening position. But if we
are testing something else, such as the
location of speakers or subwoofers, or
the effects of adding acoustic treatment,


http://www.atcloudspeakers.co.uk/

Table of Contents for the Digital Edition of Recording - March 2018

Contents
Recording - March 2018 - Intro
Recording - March 2018 - Cover1
Recording - March 2018 - Cover2
Recording - March 2018 - 1
Recording - March 2018 - 2
Recording - March 2018 - 3
Recording - March 2018 - 4
Recording - March 2018 - 5
Recording - March 2018 - Contents
Recording - March 2018 - 7
Recording - March 2018 - 8
Recording - March 2018 - 9
Recording - March 2018 - 10
Recording - March 2018 - 11
Recording - March 2018 - 12
Recording - March 2018 - 13
Recording - March 2018 - 14
Recording - March 2018 - 15
Recording - March 2018 - 16
Recording - March 2018 - 17
Recording - March 2018 - 18
Recording - March 2018 - 19
Recording - March 2018 - 20
Recording - March 2018 - 21
Recording - March 2018 - 22
Recording - March 2018 - 23
Recording - March 2018 - 24
Recording - March 2018 - 25
Recording - March 2018 - 26
Recording - March 2018 - 27
Recording - March 2018 - 28
Recording - March 2018 - 29
Recording - March 2018 - 30
Recording - March 2018 - 31
Recording - March 2018 - 32
Recording - March 2018 - 33
Recording - March 2018 - 34
Recording - March 2018 - 35
Recording - March 2018 - 36
Recording - March 2018 - 37
Recording - March 2018 - 38
Recording - March 2018 - 39
Recording - March 2018 - 40
Recording - March 2018 - 41
Recording - March 2018 - 42
Recording - March 2018 - 43
Recording - March 2018 - 44
Recording - March 2018 - 45
Recording - March 2018 - 46
Recording - March 2018 - 47
Recording - March 2018 - 48
Recording - March 2018 - 49
Recording - March 2018 - 50
Recording - March 2018 - 51
Recording - March 2018 - 52
Recording - March 2018 - 53
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Recording - March 2018 - 55
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Recording - March 2018 - 57
Recording - March 2018 - 58
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Recording - March 2018 - 60
Recording - March 2018 - 61
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Recording - March 2018 - 65
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Recording - March 2018 - 68
Recording - March 2018 - 69
Recording - March 2018 - 70
Recording - March 2018 - 71
Recording - March 2018 - 72
Recording - March 2018 - Cover3
Recording - March 2018 - Cover4
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