North Creek Big Kat North D28 User Manual - page 23
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There are two adjustments that can be made to "fine tune" the sound of the loudspeaker
system to match the sound of the room and associated equipment. These are as
follows:
Low Frequency Balance:
The extreme low end output of the Big Kat loudspeaker is controlled by the length of
straws in the port tube. There is a section in the manual regarding port tuning, but
following is a brief description of what to expect:
A port tube with long straws with have very deep bass but at a reduced level. One can
tune the Big Kat as low as 25 Hz, but the low end output will be greatly reduced and
extremely overdamped.
A port tube with short straws (or no straws) will have a lot of output but higher in
frequency. One can tune the port as high as 48 Hz, and the Big Kat will produce a
whole lot of boom at that one frequency.
We target a tuning between 32 and 35 Hz. This is achieved by using 5" straws pushed
through the port such that they stick out 1" beyond the end of the port tube and into the
cabinet. This is the optimum "QB3" alignment.
One must note it is not carved in stone what tuning will be best for the room and
equipment. The loudspeaker has the ability to be tuned anywhere in the octave
between 25 and 50 Hz, which an output control of about 6dB.
Placement
The Big Kat is capable of an extraordinary three dimensional presentation. However,
improper placement in relation to room boundaries may emphasize room frequency
response aberrations, while proper placement may eliminate them. Experimentation is
mandatory.
Do not underestimate the importance of this procedure.
As a starting point, the loudspeakers should be three inches from the back wall, six feet
apart and slightly toed in. Move the loudspeakers out from the wall in one inch steps,
then apart in six inch steps, until the bass is tight and crisp. Then, adjust the toe in by
quarter inch steps until the image focuses properly and the sound stage extends
beyond the loudspeaker positions. Last, adjust the spikes by single turns until the image
floats above and behind the speaker positions. When it locks in, you will know.
This publication is copyright
2009 by North Creek Music Systems. Unauthorized
duplication is prohibited. All rights reserved.