QSC Audio UF-3 User Manual
Page 5
3
Programming the High-Pass Filter and CD Horn Equalization
To use either the high-pass filter or the constant-directivity horn equalization, or both, set the jumper on
Jx02 across pins 2 and 3, which are the lower two pins on their header. If, however, you do not wish to
use either one and want to bypass them instead, set the jumper across pins 1 and 2.
To set the corner frequency (at which the output is 6 dB down) of the high-pass filter, choose the
appropriate value for RNx04; use the table at right.
If there is a resistor network already installed in the socket, carefully pull it straight out. Insert the pins
of the new resistor network into the socket holes and carefully press the network into the socket. Be
careful to avoid bending the pins of the resistor network. Orientation of the resistor network is
unimportant, as long as all eight pins are well seated in the socket.
In addition to enabling the high-pass filter at Jx02, if you opt for CD horn equalization you must place a
jumper at Jx03 as well. The UF-3 offers two equalization curves for CD horn correction: one with +6 dB
of boost at 20 kHz (place the jumper across pins 1 and 2 of Jx03), and one with +10 dB of boost at 20 kHz
(place the jumper across pins 2 and 3). If you do not place a jumper in one position or the other, the CD
horn equalization circuit will be inactive.
The table below is a summary of jumper settings for the UF-3; similar information is printed on the
breakaway section of the UF-3’s circuit board. Figure 4 shows how to identify the SIP resistor values.
y
c
n
e
u
q
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r
F
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z
H
(
r
o
t
s
i
s
e
r
P
I
S
e
u
l
a
v
k
r
o
w
t
e
n
0
2
K
0
2
1
0
3
K
2
8
0
4
K
6
5
0
5
K
7
4
0
8
K
7
2
0
0
1
K
2
2
0
2
1
K
0
2
0
5
1
K
5
1
0
0
2
K
2
1
0
0
3
K
2
.
8
0
0
4
K
6
.
5
0
0
5
K
7
.
4
0
0
8
K
7
.
2
0
0
0
1
K
2
.
2
0
0
2
1
K
0
.
2
0
0
5
1
K
5
.
1
0
0
0
2
K
2
.
1
0
0
0
4
0
6
5
0
0
0
5
0
7
4
0
0
0
8
0
7
2
2
&
1
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P
3
&
2
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C
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w
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s
s
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B
1
0
1
J
X
s
s
a
p
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w
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l
b
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1
0
1
J
X
s
s
a
p
-
h
g
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h
s
s
a
p
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B
2
0
1
J
X
s
s
a
p
-
h
g
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h
e
l
b
a
n
E
2
0
1
J
X
t
s
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b
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D
C
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l
b
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3
0
1
J
X
z
H
k
0
2
@
B
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6
+
,
t
s
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b
n
r
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h
D
C
3
0
1
J
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k
0
2
@
B
d
0
1
+
,
t
s
o
o
b
n
r
o
h
D
C
3
0
1
J
X
:
2
l
e
n
n
a
h
C
s
s
a
p
-
w
o
l
s
s
a
p
y
B
1
0
2
J
X
s
s
a
p
-
w
o
l
e
l
b
a
n
E
1
0
2
J
X
s
s
a
p
-
h
g
i
h
s
s
a
p
y
B
2
0
2
J
X
s
s
a
p
-
h
g
i
h
e
l
b
a
n
E
2
0
2
J
X
t
s
o
o
b
n
r
o
h
D
C
e
l
b
a
s
i
D
3
0
2
J
X
z
H
k
0
2
@
B
d
6
+
,
t
s
o
o
b
n
r
o
h
D
C
3
0
2
J
X
z
H
k
0
2
@
B
d
0
1
+
,
t
s
o
o
b
n
r
o
h
D
C
3
0
2
J
X