Room Acoustics 101
Speakers placed in a corner
will excite the greatest number of room modes (standing waves), while speakers
placed in the locations indicated will excite the least number of room
modes. Listeners will experience the smoothest response when the speakers
and listening location are placed away from room modes.
Give additional consideration
to same frequency cancellation ("suck-outs") by ensuring that the speaker's
distance from the sidewall is not the same as its distance from the front
or rear wall. Keep in mind that it is rarely possible to set up speakers
in the ideal position for all three-room dimensions. Therefore, try to
position the speakers in at least one of the recommended placement locations
by room dimension mentioned above.
Another weapon in the standing
wave knowledge arsenal is the conservative use of equalizers to help flatten
system response. However, equalizers are not a cure-all, just another potential
tool when used properly. Always exercise caution, as equalizing a particular
frequency from one listening position can cause a severe dip or boost in
another, severely altering the overall frequency balance. The potential
also exists to blow up amplifiers and woofers by trying to apply excessive
bass boost to compensate for a low frequency suck-out or cancellation point.
Before applying any equalization, first invest time in determining the
best physical speaker placement. A qualified “sound consultant” will have
the necessary test equipment to take level measurements from several listening
positions and average your results by frequency before making adjustments.
Fortunately, the wide popularity
of subwoofers can be a blessing when dealing with standing waves. Separating
the bass driver from the mid and high frequency drivers allows placement
flexibility. Also, the ability to separately adjust woofer phase can help
tame excessive standing waves to a dull roar.
Standing waves can be the
most problematic audio dilemma to solve. A combination of all the above
mentioned methods may be necessary to achieve the flattest possible frequency
response in a room. With some time invested, you can immensely improve
the sound and the entire listening / worship experience.
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This is the debut album by EXW friend Paul Langford. Paul is a Chicago based singer, arranger, keyboardist, producer and conductor. Paul has a career that spans 14 years. Paul's work includes arranging for groups like GLAD, Voices of Liberty, VoiceTrek, The Chicago based "Caroling Party" and Day of Discovery Singers. His arranging has appeared on recordings side by side with greats like Gene Puerling and David Maddux, and he has sung with Don Shelton, Bonnie Herman and Bob Bowker, among others.