Recording - September 2013 - 41

the floor, or on a shelf that is attached
to a wall. Some of the speaker’s vibration energy transfers directly into the
floor or wall, and, again, is carried
throughout the structure using conservation of momentum and energy.
This direct contact is very efficient....
and once the sound energy is in the
structure, it can travel great distances
with very little attenuation and reappear where you least expect it.
This is particularly true of low frequencies. Since they require more
power to play at a particular perceived
level, they pack more wallop. This
explains why sound leakage is often
heard as thumps and rumbles, making
woofers and subs the biggest sound
leakage offenders.
So where should we start this quest
to reduce the sound making its way
out of our studio?
Take the test
Before you start in on this project
you should purchase a Sound
Pressure Level (SPL) meter. You can
find them online from around $20 on
up, but remember that the better the
meter, the more repeatable and accurate the results. Radio Shack makes
an inexpensive one that is popular.
There are also SPL apps for iOS and

Figure 1. Newton’s Cradle. The balls in the middle don’t move, but the ball on one
end transfers energy through them to make the ball on the other end fly upward.
This is how sound is transmitted through solid objects, like walls and doors.
Android devices using smartphone
mics, but their accuracy is sometimes
questionable—get real hardware!
Play some low-frequency-heavy material at a level that you know will bother
the complainers (be nice and warn
them beforehand). Make sure you write
down what source material you play,
what level you play it at, and where you
take your measurements so you can
accurately replicate your test later.
Take a bunch of SPL readings at various positions outside your room, using
C weighting and slow response on the
meter, writing down the reading along

with the locations. The closer you can
take the reading to a complainer’s
location, the better.
Once you’ve done the work to
improve your sound leakage problems,
you can duplicate this test and see
what improvement you’ve made.
Remember to write down everything
you do in the first test so you can accurately repeat your actions in the second test. And because there is great
variation in the response of SPL
meters, even between ones of the same
model, be sure to use the same meter
each time to take a measurement.


http:// www.fxpansion.com/bfd3 http:// www.fxpansion.com/bfd3

Recording - September 2013

Table of Contents for the Digital Edition of Recording - September 2013

Recording - September 2013
Fade In
Contents
Talkback
Fast Forward
The History And Mystery Of Monitoring: A Chat With JBL’s Peter Chaikin
Better Sounds From Tight Spots
Do It Yourself: Fix Your Cables—Save Your Money!
Emotiva Pro Stealth 8 Monitors
MOTU Track16
Ashman Acoustics SOM50 Microphone
Sontronics Sonora 2
Stop Sound Leakage!
Drawmer MC2.1 Monitor Controller
Do It Yourself: Build Acoustic Treatment Right Into Your Walls!
From Shed To Studio
Sneak Previews: Apple Logic Pro X and Avid Pro Tools 11
Readers’ Tapes
Plug-In Outlet: FXpansion Bloom
Recording Fundamentals. Chapter 21: Equalization—Part 2
Advertiser Index
Fade Out
Recording - September 2013 - Intro
Recording - September 2013 - Recording - September 2013
Recording - September 2013 - Cover2
Recording - September 2013 - 1
Recording - September 2013 - 2
Recording - September 2013 - 3
Recording - September 2013 - Fade In
Recording - September 2013 - 5
Recording - September 2013 - Contents
Recording - September 2013 - 7
Recording - September 2013 - Talkback
Recording - September 2013 - 9
Recording - September 2013 - Fast Forward
Recording - September 2013 - 11
Recording - September 2013 - 12
Recording - September 2013 - 13
Recording - September 2013 - The History And Mystery Of Monitoring: A Chat With JBL’s Peter Chaikin
Recording - September 2013 - 15
Recording - September 2013 - 16
Recording - September 2013 - 17
Recording - September 2013 - 18
Recording - September 2013 - 19
Recording - September 2013 - 20
Recording - September 2013 - 21
Recording - September 2013 - Better Sounds From Tight Spots
Recording - September 2013 - 23
Recording - September 2013 - 24
Recording - September 2013 - 25
Recording - September 2013 - Do It Yourself: Fix Your Cables—Save Your Money!
Recording - September 2013 - 27
Recording - September 2013 - 28
Recording - September 2013 - 29
Recording - September 2013 - Emotiva Pro Stealth 8 Monitors
Recording - September 2013 - 31
Recording - September 2013 - 32
Recording - September 2013 - 33
Recording - September 2013 - MOTU Track16
Recording - September 2013 - 35
Recording - September 2013 - Ashman Acoustics SOM50 Microphone
Recording - September 2013 - 37
Recording - September 2013 - Sontronics Sonora 2
Recording - September 2013 - 39
Recording - September 2013 - Stop Sound Leakage!
Recording - September 2013 - 41
Recording - September 2013 - 42
Recording - September 2013 - 43
Recording - September 2013 - 44
Recording - September 2013 - 45
Recording - September 2013 - Drawmer MC2.1 Monitor Controller
Recording - September 2013 - 47
Recording - September 2013 - Do It Yourself: Build Acoustic Treatment Right Into Your Walls!
Recording - September 2013 - 49
Recording - September 2013 - From Shed To Studio
Recording - September 2013 - 51
Recording - September 2013 - Sneak Previews: Apple Logic Pro X and Avid Pro Tools 11
Recording - September 2013 - 53
Recording - September 2013 - Readers’ Tapes
Recording - September 2013 - 55
Recording - September 2013 - 56
Recording - September 2013 - 57
Recording - September 2013 - 58
Recording - September 2013 - 59
Recording - September 2013 - Plug-In Outlet: FXpansion Bloom
Recording - September 2013 - 61
Recording - September 2013 - Recording Fundamentals. Chapter 21: Equalization—Part 2
Recording - September 2013 - 63
Recording - September 2013 - 64
Recording - September 2013 - Advertiser Index
Recording - September 2013 - 66
Recording - September 2013 - 67
Recording - September 2013 - 68
Recording - September 2013 - 69
Recording - September 2013 - 70
Recording - September 2013 - 71
Recording - September 2013 - Cover3
Recording - September 2013 - Cover4
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