4
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-2 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-2.
IV. TYPICAL APPLICATIONS
Subsonic Filter
Subsonic filters are commonly used in sound installations to filter out rumbles and other inaudible or
unwanted low frequency signals and to protect speaker drivers. Vented speaker enclosures in particular
often exhibit a phenomenon in which the acoustical damping on the driver(s) drops at extremely low
frequencies below their own resonant frequency. In a situation like this, a subsonic filter will help to prevent
damage from over-excursion of the speaker cone.
Program settings:
1. Set the jumper on Jx01 to bypass the low-pass
filter (across pins 1 and 2).
2. Set the jumper on Jx02 to enable the high-pass
filter (across pins 2 and 3).
3. No jumper on Jx03.
4. Insert a resistor network in RNx04 that is appropri-
ate to the desired roll-off frequency—typically 20,
30, 40, or 50 Hz.
Typ. 20–50 Hz
Subsonic roll-off
Figure 4—UF-2 as a subsonic filter
2
&
1
s
n
i
P
3
&
2
s
n
i
P
e
n
o
N
n
o
i
t
c
n
u
F
r
e
d
a
e
H
:
1
l
e
n
n
a
h
C
s
s
a
p
-
w
o
l
s
s
a
p
y
B
1
0
1
J
X
s
s
a
p
-
w
o
l
e
l
b
a
n
E
1
0
1
J
X
s
s
a
p
-
h
g
i
h
s
s
a
p
y
B
2
0
1
J
X
s
s
a
p
-
h
g
i
h
e
l
b
a
n
E
2
0
1
J
X
t
s
o
o
b
n
r
o
h
D
C
e
l
b
a
s
i
D
3
0
1
J
X
z
H
k
0
2
@
B
d
6
+
,
t
s
o
o
b
n
r
o
h
D
C
3
0
1
J
X
z
H
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
