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Description of Controls
The unit features a comprehensive set of controld to tune the performance
of each speaker according to the conditions of use. The response may be
shaped by a combination of three parametric equalisers, each having a
switchable range of +3dB, -3dB and -6dB, and low- and high-frequency
contour controls, the effects of which are illustrated in figure 19. Selection
of the subwoofer low-pass filter frequency also provides some response
adjustment. In addition, level controls are provided to compensate for any
differences in gain between both the subwoofer and LF power amplifiers
compared to the MF/HF power amplifier.
To access the front of the unit, remove the decorative face plate by
removing the Philips screws at either end.
Refer to figure 20 for the layout of the inputs and controls, which have the
following functions:
S1
Input switch
T1
Test input socket
S2 Speaker select switch
S3 Dipole select switch
C1 High-frequency contour
control
C2 Low-frequency contour
control
S4 Subwoofer selection switch None, one or two.
S5 Subwoofer filter switch
S6 LF/Subwoofer fixed gain
C3 LF Gain
C4 Subwoofer gain
S7
Parametric filter
S8 P1 Gain
C5 P1 Q
C6 P1 Freq
S9 P2 Gain
C7 P2 Q
C8 P2 Freq
S10 P3 Gain
C9 P3 Q
C10 P3 Freq
16
To switch between test and normal
inputs.
To connect external signal generator.
To switch between front, centre and
surround channels.
To select appropriate positive lobe
orientation for left and right surround
channels in dipole mode.
Selects HF eq options. ±4dB. See
figure 19, bottom graph.
Selects LF eq options. ±6dB. See
figure 19, top graph
Selects subwoofer filter frequency.
40Hz, 50Hz, 60Hz.
Enables or disables LF and
subwoofer gain adjustment.
Adjusts LF gain.
Adjusts subwoofer gain.
Engages number of parametric filters
in circuit. None, one, two or three.
Selects gain of parametric filter 1.
Figure font: Helv 45, 7pt
-6dB, -3dB, +3dB.
Figure spacing: 7 x 7 mm
Adjusts Q of parametric filter 1
0.3 to 4.
Adjusts frequency of parametric
filter 1. 25Hz to 500Hz.
Selects gain of parametric filter 2.
-6dB, -3dB, +3dB.
Adjusts Q of parametric filter 2
0.3 to 4.
Adjusts frequency of parametric
filter 2. 25Hz to 500Hz.
Selects gain of parametric filter 3.
-6dB, -3dB, +3dB.
Adjusts Q of parametric filter 3
0.3 to 4.
Adjusts frequency of parametric
filter 3. 25Hz to 500Hz.
Figure 19
LF Contour
HF Contour
Figure 20
S1
T1 S2
S5
S7
Figure 21
Figure 21
+
S9
S10
+
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