QSC UF-3 Owners manual
UF-3UF-3
UF-3
UF-3UF-3
UniversalUniversal
Universal
UniversalUniversal
FilterFilter
Filter
FilterFilter
*TD-004031-00*
Owner’s Manual
11
*TD-004031-00*
Rev. A
UF-3 UNIVERSAL FILTER
I. DESCRIPTION
The UF-3 is an embedded dual-channel universal filter accessory for use with select QSC power amplifiers. Compatible amplifier models and lines,
both current and discontinued, include:
• All PLX, two-channel CX, and two-channel DCA models (with a BSC-3 or BSC-5 BusCard installed)
• All four-channel CX and DCA models (with a BSC-7 BusCard installed)
• PowerLight models PL 1.0, PL 1.0HV, PL 1.4, PL 1.5X, PL 1.6
• PowerLight models PL 3.4, PL 3.8X, and PL 4.0 (with a BSC-6 BusCard installed)
HVX
, PL 1.8, and PL 2.0HV (with a BSC-2 or BSC-4 BusCard installed)
• All MXa models (MX 1000a, MX 1500a, MX 2000a, and MX 3000a;
Note: does not include MX 700
), which use Level 1 Open Input
Architecture
• All EX models (EX 800, EX 1250, EX 2500, and EX 4000), which use Level 2 Open Input Architecture
• Legacy CX models CX6, CX6T, CX12, and CX12T, which use Level 1 Open Input Architecture
Using the UF-3 as a default crossover or EQ is ideal for rental sound systems, since it virtually eliminates the possibility of unauthorized tampering
with settings or other such user errors.
Physically, the UF-3 is a small circuit card that mounts inside the amplifier. Older amplifier models that use Open Input Architecture have a twosection row of 22 solder holes called a “Mini Slot” on their input boards. This is where the UF-3 is installed. The input board is part of the
removeable input module, so the UF-3 can be installed without opening the amplifier chassis or even without removing the amplifier from an
equipment rack.
The UF-3 performs the same functions as the older UF-2 accessory does, but on a smaller, more compact circuit board that can fit in more amplifier
models, such as the PowerLight 3.4, 3.8X, or 4.0. To fit in these models, the circuit board has a pre-scored breakaway section.
Newer models such as the PowerLight, PLX, DCA and CX series require the installation of an appropriate BusCard in order to provide a slot for
the UF-3. Depending on the amplifier model, a BusCard can provide as many as four slots for accessory cards. Each slot is equivalent to the “Mini
Slot” of the older amplifiers’ Open Input Architecture. For ease of installation, it is best to mount the UF-3 to the BusCard before installing the
BusCard itself inside the amplifier.
The installation process involves soldering, so only qualified technical persons should attempt to install the UF-3; ideally, you should enlist QSC’s
Technical Services department or an authorized service center to perform the task. The installation section of this manual offers more information
about installing the UF-3.
II. FEATURES
The UF-3 allows independent filtering of the two audio channels. You can select high-pass, low-pass, or bandpass filtering, as well as the
frequencies of the filtering.
Either channel’s circuitry contains electronically balanced input circuitry and bypassable low-pass and high-pass circuitry. Each filter circuit has
a four-pole (24 dB/
octave) Linkwitz-Riley
alignment. Figure 1
shows a block diagram of the UF-3.
(+) Input
(-) Input
Figure 1—Block diagram of UF-3 (1 of 2 channels shown)
Input
Differential
Amplifier
Low-Pass Filter Bypass High-Pass Filter Bypass
Programmable
Linkwitz-Riley
Low-Pass Filter
1
2
3
3-pin
jumper block
Optional
CD Horn
Boost
Programmable
Linkwitz-Riley
High-Pass Filter
1
1
2
3
3-pin
jumper block
Channel
Output
III. PROGRAMMING THE UF-3
RN102
( of low-pass filter)
f
RN104
( of high-pass filter)
f
RN204
( of low-pass filter)
f
RN202
( of high-pass filter)
f
(low-pass bypass/enable)
J101 J102
(high-pass bypass/enable)
J103
(CD horn EQ)
(low-pass bypass/enable)
J202 J201
(high-pass bypass/enable)
(CD horn EQ)
J203
1
2
3
1
2
3
1
2
3
1
2
3
Channel 1 Channel 2
The UF-3 circuit board has six 3-pin headers and four SIP resistor network sockets (see Figure 2). All are used for programming the module. The
circuitry for the two channels is identical, so the headers and sockets are divided between them: those designated by a three-digit number starting
in a “1” (headers J101, J102, and J103; and SIP resistor network sockets RN102 and RN104) are for Channel 1, while those with a three-digit
number starting in a “2” are for Channel 2. The following instructions will use an “x” in place of the first digit, except where a specific channel
reference is necessary.
Notes on Stereo, Bridged, or Parallel
Operation
Except for specialized bi-amp models such as the
PowerLight 1.5X, 1.6
UF-3 is installed has a switch for setting the operating
mode of the amplifier, i.e., stereo, parallel mono, or
bridged mono. In the signal flow, the UF-3 accessory is
located after the switch, so you must configure both
channels of the UF-3 accordingly, whatever the operating
mode. Usually you would use identical settings on both
channels in stereo or parallel mode, depending on the application. If the amplifier is in bridged mode, bypass
Channel 2 of the UF-3 and use the Channel 1 input and processing only.
HVX
, or 3.8X, the amplifier in which the
Figure 2—UF-3 Circuit board jumper and resistor network locations
1
2
3
Pins 1 & 2
shorted together
Bypassing the Filtering
To completely bypass the filtering circuitry of a channel, set the jumpers on both Jx01 and Jx02 across pins 1 and
2, which are the upper two pins on their headers (see Figure 3). Note: If you neglect to place jumpers on either
header, no signal will pass on that channel.
ycneuqerF
)zH(
08K021
001K28
021K86
061K65
002K74
052K33
005K81
008K21
0001K2.8
0021K8.6
0061K6.5
rotsiserPIS
eulavkrowten
Programming the Low-Pass Filter
To use the low-pass filter, set the jumper on Jx01 across pins 2 and 3, which are the lower two pins on
their header. If, however, you do not wish to use the low-pass filter and want to bypass it instead, set the
jumper across pins 1 and 2.
To set the corner frequency (at which the output is 6 dB down) of the low-pass filter, choose the appropriate
value for RNx02; use the table at left.
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.
1
Pins 2 & 3
2
shorted together
3
1
2
3
Figure 3—Jumper positions
0002K7.4
0052K3.3
0005K8.1
0008K2.1
00061065
00002074
2
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.
ycneuqerF
)zH(
02K021
03K28
04K65
05K74
08K72
001K22
021K02
rotsiserPIS
eulavkrowten
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.
2&1sniP3&2sniPenoN
noitcnuFredaeH
ssap-wolssapyB101JX
ssap-wolelbanE101JX
ssap-hgihssapyB201JX
:1lennahC
:2lennahC
ssap-hgihelbanE201JX
tsoobnrohDCelbasiD301JX
zHk02@Bd6+,tsoobnrohDC301JX
zHk02@Bd01+,tsoobnrohDC301JX
ssap-wolssapyB102JX
ssap-wolelbanE102JX
ssap-hgihssapyB202JX
ssap-hgihelbanE202JX
tsoobnrohDCelbasiD302JX
zHk02@Bd6+,tsoobnrohDC302JX
zHk02@Bd01+,tsoobnrohDC302JX
051K51
002K21
003K2.8
004K6.5
005K7.4
008K7.2
0001K2.2
0021K0.2
0051K5.1
0002K2.1
0004065
0005074
0008072
3
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