Recording - March 2017 - 54

construction wasn't permitted and inspected, there's no way to know with any confidence how the wall was built. I expect all the other walls and the ceiling to have been
built the same way.
What this leaves us with is walls with panels between each stud that can vibrate in the
presence of sound (and absorb energy by doing so). And vibrate they do, with each one
resonating at its own unique frequency, and with greater level due to the sloppy-floppy
construction technique. Shake well and multiply times four walls and one ceiling-an
excellent recipe for low frequency loss.
Now add a nice set of
speakers playing loud music. It takes a little time to
see things manifest, but
we must give Newtonian
physics time to work its magic. The inertia of each one
of those panels takes some
time to overcome, and
for the panels to take on
FIGURE 1
enough acoustical energy to
really get moving. You can
start to see the effect at 40
milliseconds, and it's pretty much going full force at 120 milliseconds. Which, by the
way, translates to around 45 feet and 135 feet of sound travel, respectively-so
again, it's not caused by phase interference.
Once fully excited, those panels are merrily changing acoustical energy into mechanical energy, effectively
absorbing around their chosen
frequencies. According to the
data, the LF losses continue
out to around 320 milliseconds, where the response
evens out, and the LF is
primarily low-level ambient noise. At this point fricFIGURE 2
tion and dissipation have
changed the mechanical energy into heat, which in turn
gets sucked up by the air conditioning and unceremoniously thrown outside. So I suppose
you could say your missing LF got the boot out the door.

Every picture tells a story

The bigger picture here is that there are a lot of things that are missed if you don't
consider the time aspect of sound, which a realtime analyzer does not. A lot happens
in the time domain, and as
we see with the AWOL low
frequency, there are things
that can go wrong and leave
you baffled if you don't know
where to look.
Figure 1 shows the direct
sound for a room with the
dreaded bass suck-out (all the
graphs are 10 to 1000 Hz
54

RECORDING MARCH 2017


http://www.adkmic.com

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
http://www.nxtbook.com/musicmaker/musicmaker/recording_202002
http://www.nxtbook.com/musicmaker/musicmaker/recording_202001
http://www.nxtbook.com/musicmaker/musicmaker/recording_201912
http://www.nxtbook.com/musicmaker/musicmaker/recording_201911
http://www.nxtbook.com/musicmaker/musicmaker/recording_201910
http://www.nxtbook.com/musicmaker/musicmaker/recording_201909
http://www.nxtbook.com/musicmaker/musicmaker/recording_201908
http://www.nxtbook.com/musicmaker/musicmaker/recording_201907
http://www.nxtbook.com/musicmaker/musicmaker/recording_201906
http://www.nxtbook.com/musicmaker/musicmaker/recording_201905
http://www.nxtbook.com/musicmaker/musicmaker/recording_201904
http://www.nxtbook.com/musicmaker/musicmaker/recording_201903
http://www.nxtbook.com/musicmaker/musicmaker/recording_201902
http://www.nxtbook.com/musicmaker/musicmaker/recording_201901
http://www.nxtbook.com/musicmaker/musicmaker/recording_201812
http://www.nxtbook.com/musicmaker/musicmaker/recording_201811
http://www.nxtbook.com/musicmaker/musicmaker/recording_201810
http://www.nxtbook.com/musicmaker/musicmaker/recording_201809
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201808
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201807
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201806
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201805
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201804
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201803
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201802
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201801
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201712
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201711
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201710
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201709
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201708
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201707
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201706
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201705
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201704
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201703
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201702
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201701
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201612
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201611
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201610
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201609
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201608
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201607
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201606
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201605
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201604
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201603
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201602
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201601
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201512
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201511
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201510
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201509
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201508
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201507
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201506
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201505
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201504
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201503
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201502
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201501
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201412
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201411
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201410
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201409
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201408
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201407
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201406
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201405
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201404
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201403
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201402
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201401
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201312
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201311
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201310
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201309
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201308
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201307
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201306
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201305
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201304
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201303
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201302
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201301
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201212
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201211
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201210
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201209
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201208
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201207
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201206
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201205
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201204
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201203
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201202
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201201
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201112
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201111
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201110
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201109
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201108
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201107
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201106
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201105
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201104
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201103
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201102
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201101
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201012
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201011
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201010
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201009
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201008
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201007
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201006
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201005
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201004
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201003
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201002
http://www.nxtbook.com/nxtbooks/musicmaker/recording_201001
http://www.nxtbook.com/nxtbooks/musicmaker/recording_200912
http://www.nxtbook.com/nxtbooks/musicmaker/recording_200911
http://www.nxtbook.com/nxtbooks/musicmaker/recording_200910
http://www.nxtbook.com/nxtbooks/musicmaker/nxtd
http://www.nxtbookMEDIA.com