Recording - March 2017 - 55

and 20 to 110 dB SPL). It's not great, but
not really that bad for an untreated room.
Now look at Figure 2 to see what has
happened at 80 milliseconds down the
road (the direct sound graph is shown for
easy comparison).
The peak at ~16 Hz is air conditioner
noise, and the peaks at 45, 87, and
134 Hz are room resonances. At 80
milliseconds we're already starting to
see a highpass developing from ~110
Hz down, with the room resonances
pushing up through the rolloff.
Now at 160 milliseconds (Figure 3), we
can see the low-frequency deficiency really
developing, with the room resonances
trying to make up some of the losses.

FIGURE 4
At 240 milliseconds (Figure 4) the
mechanical energy in the drywall panels
is starting to dissipate and the rest of the
spectrum is decaying, so the overall
response is starting to level out. Except,
of course, for the room resonances,
which are still raging along.
At 320 milliseconds (Figure 5), the 45
Hz resonance has pretty much dissipated
while the 87 Hz one still has some energy to it, and some phase cancellation dips
have appeared, but overall things are leveling out.
Like many things in life, what you see
depends on how you look at it. Taking
the graphs in total, it's apparent that
the low frequency starts out OK in the
direct sound, drops out over a quarter of

FIGURE 5

RECORDING MARCH 2017

55


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Table of Contents for the Digital Edition of Recording - March 2017

Contents
Recording - March 2017 - Intro
Recording - March 2017 - Cover1
Recording - March 2017 - Cover2
Recording - March 2017 - 1
Recording - March 2017 - 2
Recording - March 2017 - 3
Recording - March 2017 - 4
Recording - March 2017 - 5
Recording - March 2017 - Contents
Recording - March 2017 - 7
Recording - March 2017 - 8
Recording - March 2017 - 9
Recording - March 2017 - 10
Recording - March 2017 - 11
Recording - March 2017 - 12
Recording - March 2017 - 13
Recording - March 2017 - 14
Recording - March 2017 - 15
Recording - March 2017 - 16
Recording - March 2017 - 17
Recording - March 2017 - 18
Recording - March 2017 - 19
Recording - March 2017 - 20
Recording - March 2017 - 21
Recording - March 2017 - 22
Recording - March 2017 - 23
Recording - March 2017 - 24
Recording - March 2017 - 25
Recording - March 2017 - 26
Recording - March 2017 - 27
Recording - March 2017 - 28
Recording - March 2017 - 29
Recording - March 2017 - 30
Recording - March 2017 - 31
Recording - March 2017 - 32
Recording - March 2017 - 33
Recording - March 2017 - 34
Recording - March 2017 - 35
Recording - March 2017 - 36
Recording - March 2017 - 37
Recording - March 2017 - 38
Recording - March 2017 - 39
Recording - March 2017 - 40
Recording - March 2017 - 41
Recording - March 2017 - 42
Recording - March 2017 - 43
Recording - March 2017 - 44
Recording - March 2017 - 45
Recording - March 2017 - 46
Recording - March 2017 - 47
Recording - March 2017 - 48
Recording - March 2017 - 49
Recording - March 2017 - 50
Recording - March 2017 - 51
Recording - March 2017 - 52
Recording - March 2017 - 53
Recording - March 2017 - 54
Recording - March 2017 - 55
Recording - March 2017 - 56
Recording - March 2017 - 57
Recording - March 2017 - 58
Recording - March 2017 - 59
Recording - March 2017 - 60
Recording - March 2017 - 61
Recording - March 2017 - 62
Recording - March 2017 - 63
Recording - March 2017 - 64
Recording - March 2017 - 65
Recording - March 2017 - 66
Recording - March 2017 - 67
Recording - March 2017 - 68
Recording - March 2017 - 69
Recording - March 2017 - 70
Recording - March 2017 - 71
Recording - March 2017 - 72
Recording - March 2017 - Cover3
Recording - March 2017 - Cover4
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