Recording - March 2014 - 63
You can cover it with fabric, veneer it,
stain it, paint it, or finish it however you
like. Once installed, you can put things
on it or use it to support other room treatments; that won't affect the performance.
The most important part is to not block the
port. The hardware cloth over the port is
to keep pets and other creatures from setting up homes inside the resonator.
The resonator in the photos was built to
the same dimensions and specifications as
the drawing. This particular one will likely
end up in a friend's home theater to
counter a modest response rise at 100 Hz.
Tweaks
If you would like to do some experimenting, you can make the panel with the port
interchangeable. Don't glue or caulk this
panel when you install it. Instead, just use
screws so it's removable, and install gasket
material where the panel mates to the cabinet for air tightness. I use 3M 130C splicing tape for gasketing, but other squishy
gasket material will work too.
...but in this case, 100 Hz
was chosen as a good
general number, one that
will probably influence
some of the resonances
in your room to a degree.
You can then make different panels
with different-sized ports. Larger ports
provide a higher frequency tuning, and
smaller ports provide lower. Note that the
frequency doesn't shift linearly, so a port
half the size does not lower the frequency
by half. It's a lot more complicated than
that. Use the numbers I've given on the
drawing as places to start.
You can also adjust the shape of the
resonator. As long as you stick with using
2 x 4 framing, the same size port, and
maintain the same panel area (length
times height), you can change the width
and height and the tuning will remain the
same. This is one of the truly handy features of Helmholtz resonators-you can
make it fit the available location.
I'd like to hear how this works for you!
Bruce Black (black@recordingmag.com)
is a recording and post-production engineer now working as an acoustics consultant with Media Rooms Tech in Ventura,
CA. Learn more at mediaroomstech.com
and read Bruce's acoustics blog online at
manofacoustics.com.
http://www.ftc.edu
http://www.ftc.edu
http://www.kiqproductions.com
http://www.kiqproductions.com
http://www.mediaroomstech.com
http://www.manofacoustics.com
Recording - March 2014
Table of Contents for the Digital Edition of Recording - March 2014
Contents
Recording - March 2014 - Cover1
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Recording - March 2014 - 1
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Recording - March 2014 - Contents
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