Model lCi Operation Manual
LISTENING
HEIGHT
The sound from a properly aligned loudspeaker
reaches the listener with the audible frequencies correct in
both time and phase. This alignment contributes to a more
accurate sound, but also increases the importance of the
height relationship between the speaker and the listener.
When placed on a spiked base with a 2-inch total height,
the Model 1Ci's vertical listening window is centered at 32
inches. It extends about 4 inches above and below the
nominal height. Outside of this 8-inch vertical listening win-
dow, the sound and performance of the speaker will be
somewhat compromised.
If your Model lCi’s are on 2
1/2
inch high dedicated bases
and you wish to maximize the speakers' performance,
please follow these instructions.
1.
Measure the distance from the listening position to the
speakers and the height of your ears when you are seated
at the listening position. (Ear height is roughly equal to
the height of the tip of your nose.)
2.
Find the values closest to your actual measurements on
the chart to the right.
3.
Follow the horizontal line across from your distance and
the vertical line up from your ear height to the point where
they intersect. The graph lines numbered from 0 to 3 indi-
cate how many inches the top of the speaker should be
behind the bottom of the speaker to center the eight-inch-
high listening window at your particular listening height
and distance.
4.
Adjust the length of the base's front and rear spikes to
lean the speakers backward the proper amount.
5.
As an example of how to accomplish the proper amount
of lean:
a. Tie a nut to a piece of thread about four feet long.
b. Hang the thread and nut from the back of the speaker
and measure the distance between where the thread
attaches to the nut and the bottom of the speaker as
shown in the diagram. This measurement is the amount
of speaker lean. (For clarity, the amount of lean in the
diagram has been exaggerated and the base is not shown.)
Distance From Speakers In Feet
Average Ear Height In Inches
THE CONTOUR CONTROL
A tweeter contour control is on the aluminum dress
plate at the rear of the Model lCi. This control adjusts the
tweeter level over a limited range. The control may be used
to compensate for a bright or dull room that could not be
corrected with speaker placement, acoustic treatments or
other passive means. The control is limited in its effect and
even at maximum rotation it will not take the response of
the speaker out of a plus or minus 3dB envelope. Changing
the contour control will not affect the detail, imaging or
phase performance of the speaker due to its unique incor-
poration into the crossover circuitry.
Do not change the tweeter contour controls and the
speaker placement at the same time. After adjusting the
contour controls or altering the speaker placement, careful-
ly listen for the sonic differences the change has made
before making any other changes to the system.
The Model 1Ci requires at least 100 hours at a moderate volume level before its
performance and response stabilize. Higher volume levels will not shorten this break-in
period.
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