Recording - March 2015 - 14
Basic
Acoustics:
either side of the center of each wall, so
each wall half is a mirror image of the
other. This way, as you move to your left
and right, any changes to the sonic quality
will sound the same. (Note: Front and rear
walls don't need to be symmetrical or mirror images to each other.)
This a simple issue to fix. Get your
speakers as centered as you can, and
make the left and right wall surfaces
match, preferably by making the reflective side more absorptive.
Problem #2: Rampaging Reflections
When your speaker puts out a sound,
the first thing you hear is the sound taking
the shortest path. This is called the direct
sound. Meanwhile sound also reflects off
the room's surfaces.
At a position on the surfaces called the
point of first reflection, sound is also
reflected back to your ears. Because this
first reflection has a longer path to travel,
it is delayed. This reflected sound combines with the earlier direct sound, causing comb filtering and smearing of the
localization. See Figure 1.
2. Absorption turns sound passing through a material into heat (as shown at left,
mainly effective at higher frequencies) or causes a structure to resonate, turning
sound into mechanical motion (as with the Helmholtz resonator at right, mainly
effective at lower frequencies).
Multiple hard reflections can also play
tricks with your ears. If you've ever been listening in a room and had the position of
instruments jump around unexpectedly,
you're experiencing reflections that focus the
sound. In critical listening situations, the question then becomes, "Which position is the
real one?" This focusing comes when you
have sound reflecting out of a concave surface like a corner.
Problem #3: Reckless Reverb
Have you ever gone into a restaurant or
bar and had difficulty understanding what
someone else was saying, even if they
were right next to you? This is a problem
with an overly reverberant room. Sound
reflects off hard surfaces over and over,
and sonic events linger far too long, seriously overlapping and masking each other.
In speech, this can make the spoken
word completely unintelligible. In music it
can wreck the definition and clarity of notes
and instruments, and smear localization.
Check out Julian Treasure's TED Talk at
http://is.gd/TEDJulianTreasure to learn
more.
Problem #4: Rioting Resonances
In every enclosed space, there are certain frequencies that seem louder due to
their waveform peaks lining up with each
http://www.is.gd/TEDJulianTreasure
Recording - March 2015
Table of Contents for the Digital Edition of Recording - March 2015
Contents
Recording - March 2015 - Cover1
Recording - March 2015 - Cover2
Recording - March 2015 - 1
Recording - March 2015 - 2
Recording - March 2015 - 3
Recording - March 2015 - 4
Recording - March 2015 - 5
Recording - March 2015 - Contents
Recording - March 2015 - 7
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Recording - March 2015 - Cover3
Recording - March 2015 - Cover4
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