gulton Electro-Voice XEQ-3 User manual

EledroT/bice
XEQ-3
ELECTRONIC CROSSOVER
XEQ-3
ELECTRONIC
CROSSOVER
a§ulton company
SERVICE
MANUAL

Table of Contents
XEQ-3 SERVICE MANUAL
TABLE OF CONTENTS
Page
Specifications 2
Description 3
Connections 3
Control Functions 3,4
Equalization 4
Custom Low-Frequency Modules 4
Module Construction 5
Non-Standard Crossover Frequencies 5
Output Transformers 5
Figures 6
Linkwitz-Riley Filter Advantages 7
PC Board 8
Schematic 9
Schematic 10
Schematic 11
Parts List 12
Repair Parts/Warranty 13
one

SPECIFICATIONS
CHANNEL CONFIGURATION —
Monaural three-way, switchabie to monaural two-way
FILTER TYPE —
Fourth-order Linkwitz-Riley (24-dB-per-octave attenuation)
CROSSOVER FREQUENCIES, SWITCH SELECTABLE —
(See text for other possible frequencies)
Low-Mid: 80. 125, 160. 250. 500 and 800 Hz
Mid-High: 500, 800. 1250. 1600. 5000 and 8000 Hz
OUTPUT DELAYS —
Type: Fourth-order all-pass continuously variable
time constant, linear control scale
Range: Low: 6its ("O ') to 6ms
Mid: 1ps ("0") to 1ms
High 0.3 pS ("0") to 0.3 ms
INFRASONIC SPEAKER PROTECTION —
Filter Type: Second-order Butterworth (12-dB-per-octave slope)
Corner Frequencies: 16 or 32 Hz. provided by supplied HP16/32
plug-in module (see text lor other frequencies)
EQUALIZATION FOR "STEP-DOWN” OPERATION
OF TL BASS SPEAKER SYSTEMS —
Filter Type: Second-order underdamped (12-dB-per-octave rolloff
below plus-6-dB peak-boost frequency)
Peak-Boost Frequencies: 29, 35, 45 and 60 Hz provided by
optional EB29/35 and EB45/60 plug-in
modules (see text for other frequencies)
EQUALIZATION OF MID- AND HIGH-FREQUENCY OUTPUTS,
PROVIDED BY PLUG-IN MODULE —
Normally Supplied: EQF module (for flat electnval frequency response)
Optional Modules, for Rat Acoustic Response of Compression
Drivers on Constant-Directivity Horns: EQA. EQB
.
(see Table 1for complete list)
INPUT —
Type: Active differential
Maximum Level: +18 dBu
Impedance: 20,000 ohms
Common-Mode Range: ±24 V(net of signal voltage)
Common-Mode Rejection Ratio, Typical: -55 dB
Connector: Female 3-pin XLR type
MAIN OUTPUTS —
Type: floating differential (THB-2 set of three isolation
transformers available; see text)
Maximum Level: +18 dBu
Impedance: 100 ohms
Minimum Load Impedance for Full Output Level: 600 ohms
Protection: Safe for short circuit or ±25 volts dc
Connectors: Male 3-pin XLR type
LOW-MIX (COMMON-BASS) OUTPUT —
Impedance: '.800 ohms
Connector: RCA-type phono jack
GAIN —
Level Controls at Center Detent: Unity
Adjustment Range re Unity Gain, Continuously Variable: ±t2 dB
FREQUENCY RESPONSE, SUM OF OUTPUTS,
LEVEL CONTROLS AT CENTER DETENT,
2,000-OHM LOADS —
20-20.000 Hz ±0.5 dB
TOTAL HARMONIC DISTORTION, 20-20,000 Hz —
Typical: 0.02%
Maximum: 01%
NOISE, EACH OUTPUT, CONTROLS FLAT,
20-20,000-Hz NOISE BANDWIDTH —
Typical: -90 dBu
CHANNEL CROSSTALK —
Typical: -78 dB
TRANSIENT PERFORMANCE —
Not limited by slew rate or power bandwidth under normal
operating condition. 20-20,000 Hz
LED LEVEL INDICATORS —
(Level-dependent brightness provides enhanced resolution)
Green: Input level above -20 dBu
Yellow: Input level above 0dBu
Red: Input or any output level above +16 dBu
FRONT-PANEL CONTROLS —
Each Output: Gain, delay, polarity and channel mute
CHASSIS CONSTRUCTION —
Painted aluminum
COLORS —
Black with white graphics
MOUNTING —
Standard 19-tn rack panel, 144 in high, 7in. deep behind panel
SUPPLIED ACCESSORIES —
HP16/32 plug-in high-pass filter module for 16- or 32-Hz
low-frequency protection. BMK blank plug-in module for
construction of custom modules; smoked
acrylic security cover
OPTIONAL ACCESSORIES -
EQA, EQB .piug-m equalization modules for
flat acoust cresponse of compression drivers on
constant-directivity horns (see Table 1lor complete list):
TRB-2 set of three output isolation transformers
POWER REQUIREMENTS —
100-120 Vac, 60-60 Hz. 10 W
(also available for 80-110 and 220-240 Vac. 50-60 Hz)
OVERALL DIMENSIONS —
(see Figure 1)
44 mm (1.73 in.) high
483 mm (19.0 in.) wide:
185 mm (7 28 in.) deep
NET WEIGHT —
3.1 kg (6.8 lb)
SHIPPING WEIGHT:
38kg (8.4 lb)

XEQ-3 SERVICE MANUAL Description, Connections, Control Functions
DESCRIPTION
The XEQ-3 electronic crossover/equalizer is intended
primarily for high-quality sound systems which require
precise crossover filtering and accurate speaker system
compensation for optimum frequency and time response.
The XEQ-3 incorporates fourth-order Linkwitz-Riley
frequency-dividing networks which have two unique advan-
tages over the third-order Butterworth networks often used
in high-performance professional sound systems. First, a
fourth-order network offers an out-of-passband attenuation
rate of 24 dB per octave, greater than the 18-dB-per-
octave rate of athird-order network. This provides better
protection of drivers from energy outside their frequency
range, important in some applications. Second, the
Linkwitz-Riley network has "zero lobing error,” for
smoother overall frequency response in the crossover
region. This concept is treated in more detail in the
section below.
Each output of the XEQ-3 has avariable time-delay
equalizer which is capable of compensating for different
speaker mounting positions and phase responses, so that
proper acoustic summing will occur at the crossover
frequencies. Each output also has an EQ section controlled
by aplug-in module. The LOW EQ can be used as an
infrasonic filter or for “step-down" operation of TL bass
speaker systems. The MID EQ and HIGH EQ are designed
to provide constant-directivity horn and driver equalization
when used with the appropriate module. The XEQ-3 is
supplied with an HP16/32 module (infrasonic filter at 16 or
32 Hz) for the LOW EQ and two EOF modules (flat
response, no EQ) for the MID EQ and HIGH EQ sections.
Other modules can be ordered from Electro-Voice or
custom built using the supplied BMK blank module.
Other features include alevel display for optimizing
dynamic range; alevel control, polarity reverse switch and
mute switch for each output; switches which allow two-way
crossover operation; and floating differential input and
outputs. Output transformers (Electro-Voice TRB-2 set of
three) can be installed if desired.
The XEQ-3 mounts in one EIA rack space and is
supplied with asmoked acrylic front cover to prevent
uninvited control adjustment. Figure 2shows the XEQ-3
block diagram.
CONNECTIONS
Input and Outputs
The input connector is a3-pin female XLR type; output
connectors are 3-pin male XLR type. Pins 2and 3are
signal and each pin 1is ground. This grounding arrange-
ment works well in most installations; pin 1can be used as
aground reference or, if there is another reference (a
ground loop is formed), then the resistor allows pin 1to
follow the other ground reference. Asolid chassis ground
connection can be obtained at the connector shell.
Low Mix
The low-mix (or "common-bass") connection is an RCA
phono jack which allows the low output to be mixed with
the low output of another XEQ-3 or XEQ-2. This can
improve the performance of stereo or multi-channel installa-
tions by equally distributing low-frequency energy among
the low-frequency speakers. The low-mix connection also
allows the use of asingle amplifier/ subwoofer combination
in stereo or multi-channel systems.
Any number of crossovers may be used this way by
connecting their low-mix jacks together. When XEQ's are
Interconnected in the low-mix mode, any or all of the low-
frequency outputs may be used. These outputs will have a
common signal but their individual level, polarity, mute and
delay controls will still function independently,
Power
Agreen LED on the front panel indicates when ac power
in ON. The XEQ-3 may be left on indefinitely or externally
switched with other equipment.
CONTROL FUNCTIONS
Crossover Frequency
The six-position rotary switches select the frequencies for
the low-mid and mid-high crossover filters. The correspond-
ing outputs will be 6dB down at the selected frequency,
compared to the midband response. See Figure 3.
The XEQ-3 can be modified to provide other frequencies
—see Non-Standard Crossover Frequencies section.
Input Level Indicator
The level of the input signal to the XEQ-3 is monitored with
three LED's. The green LED indicates signal above
-20 dBu, and the yellow LED lights when the signal
reaches 0dBu. The red LED lights if the input or any
output exceeds +16 dBu. In normal operation, the yellow
LED should light much of the time (indicating normal signal
level) but the red LED should not light.
Level Controls
Each of the three outputs has alevel control with a
±12 dB range. The center detent position is unity gain.
These controls are intended for fine-tuning the system
response; large differences in speaker output should be
approximately compensated with the power amplifier’s
attenuators and then accurate level matching can be
achieved with the XEQ-3 level controls.
Polarity Reverse Switches
These switches will reverse the polarity of the correspond-
ing output. These are used primarily to assist adjustment of
the delay control.
Mute Switches
When amute switch is pressed, the corresponding output
will be shut off. These are useful for setup, calibration, and
troubleshooting.
The floating differential input and outputs can be unbalanced
and referenced to other equipment, or they can be
connected to balanced lines. If atrue balanced source (or
load) is needed, connect a300-ohm resistor from pin 2to
pin 1and another 300-ohm resistor from pin 3to pin 1
.
Time-Delay Controls
Each output on the XEQ-3 has time-delay control which
allows compensation for the time- and phase-response
differences which exist in almost all practical multi-way
speaker setups. The delay sections are four-pole, all-pass
three

XEQ-3 SERVICE MANUAL Control Functions, Equalization, Custom Low-Frequency Modules
Time-Delay Controls (continued)
filters with continuously variable time constants (see Figures
4and 5). Adjusting adelay control is acoustically
equivalent to physically moving the corresponding speaker
with respect to the others The delays available may not
always be sufficient to compensate for all physical location
differences encountered. However, half-wavelength shifts
should nearly always be possible, thus eliminating the
interference cancellations that can occur at crossover.
Normally only two delay controls are needed in aparticular
setup; the speaker with its acoustic center furthest from the
listener should have its delay control left at "0." There may
be exceptions to this, such as when acertain unusual time
response is desired The best way to adjust these controls
is by measunng the direct-field on-axis frequency response
using aplotter or aspectrum analyzer: reverse the polarity
of the output to be adjusted, turn the delay control until the
deepest possible response null occurs at the crossover
frequency, then restore the correct polarity. The result will
be optimum phase and frequency response through the
crossover region. The delay controls can also be adjusted
with just an oscillator, set at the crossover frequency, by
listening for and adjusting for the null, on axis and in the
speaker system's direct sound field Switching to the
correct polarity will then yield flat response. Set the level
controls first, then set the delay controls.
Two-Way Operation
The XEQ-3 can easily be set up for two-way operation by
pressing one of the switches on the back panel. Which
switch to press (LOW-MID or LOW-HIGH) depends on
which crossover ferquency range is needed. The two
corresponding outputs are then used. The third output can
be used also, if another speaker in astack or cluster
needs adifferent equalization module or control setting.
For example, by pressing LOW-MID and setting both
crossover frequency switches to 500 Hz or 800 Hz, the
mid and high outputs have the same frequency range but
separate controls and EQ. The possible combinations are
shown in Figure 6.
EQUALIZATION SECTIONS
Low-Frequency Equalization
The LOW EQ socket accepts plug-in modules for different
types of high-pass filters. The HP16/32 module (supplied)
will provide asecond-order Butterworth (maximally flat)
response with acutoff frequency of either 16 Hz or 32 Hz,
depending on which number is right-side up when the
module is installed. Other modules are available for “step-
down'' operation (low-frequency extension) of Electro-Voice
TL oass speaker systems. The EB29/35 and EB45/60
provide 6dB of boost at the corresponding peak fre-
quencies. for this purpose. Modules can be contructed for
other frequencies and high-pass filter types —see Custom
Low-Frequency Modules section,
Mid- and High-Frequency Equalization
The MID EQ and HIGH EQ circuits are identical to each
other, but are in the mid and high signal paths, respectively.
These circuits will accurately equalize high-performance
compression drivers used with constant-directivity horns.
The proper EQ module for use with various EV horn-driver
combinations is shown in Table 1
.
For applications requiring flat electrical frequency response,
use EOF modules. The XEQ-3 is supplied with EOF
modules installed in the MID EQ and HIGH EQ sockets.
Model Used With
Horn Driver
EQA HR90 DH1012A,
DH1506
EQB HR120, SM120
EQC HR40, HR60
EQD HR9040A, HR4020A
EQE HR6040A
EOF FLAT
EQG HR90
DH2012
EQH HR120
EQJ HR40, HR60
EQK HR9040A, HR4020A
EQL HR6040A
EQM HP940
DH1 ,DH1A
DH2
EQN HP1240
EQO HP420, HP640
EQP HP9040, HP4020
EQO HP6040
EQR HP940
DH1A
EQS HP1240
EOT HP640
EQU HP4020.HP9040.HP6040
EQV HP420 TABLE 1
Horn/Driver Equalization Modules
CUSTOM LOW-FREQUENCY MODULES
High-Pass Filters
If alow-frequency cutoff other than 16Hz or 32 Hz is
needed, amodule can be constructed for other fre-
quencies by soldering resistors into the supplied BMK
blank module kit. Two resistors are needed for each filter
frequency. Note that each module can accommodate two
frequencies since there are two ways to plug it into the
socket. One-quarter-watt film resistors having aresistance
tolerance of 1% or 2%are recommended, but in less
critical applications, 5% resistors may suffice. Mil-type
RN55D resistors are easiest to use; however, conformally
coated resistors may also be used In the following
formulas, R, and R2are in ohms, and f3is the corner
frequency in Hz:
o_106 x10'3
’~4.7 x10sxf3-225 x10s
R. „Ri x4,7 x106
2xR, +9.4 x106
For maximally extended low-frequency response, use
Ri =1megohm and leave R2out. The f3will then be
around 5Hz to 10 Hz, depending on the load impedance,
Step-Down EQ Modules
To make modules for step-down equalization of
low-frequency speaker systems, use the following formulas
The equalization circuit will produce a6-dB peak at the
frequency fpand a12-dB-per-octave rolloff below the peak-
a _ 3.11 x10’ 3
'4 7 x106xf„ -6.61 x10®
R., =443 xIQs

Module Construction, Non-Standard Crossover Frequencies, Output Transformers
XEQ-3 SERVICE MANUAL
Module Construction
In addition to the Electro-Voice BMK blank module kit, the
following items are required:
1. Two or four resistors, calculated from the formulas
given above.
2. Low-wattage soldering iron with small chisel tip.
3. Electronic-grade solder, 63/37 or 60/40 alloy,
rosin core.
NON-STANDARD CROSSOVER FREQUENCIES
The XEQ-3 can be modified to provide crossover
frequencies other than the six frequencies available at each
switch. This is easily done (only resistors and aphillips
screwdriver are needed) if the new crossover frequency is
between 80 Hz and 800 Hz for the low-mid switch and
between 500 Hz and 8,000 Hz for the mid-high switch.
Four Vi-watt, 1% resistors are needed for each filter switch
For acrossover frequency fc,the following resistor value is
needed:
1.
Low-mid filter:
4. Flush-cutting diagonal cutters.
5. Aspare 16-pin DIP socket.
6. Adhesive: epoxy, super glue or hot melt.
7. Various hand tools, as needed.
Refer to the diagram in Figure 7:
1. Insert the DIP plug into the spare socket or use the
one on the XEQ-3. This helps to keep the pins in
alignment during soldering.
2. Locate pin 1by the cut-off corner on the plug.
3. Place and solder the resistors one by one and trim
each lead close enough to the pin to allow later
installation of the cap. If you are using conformally
coated (dipped) resistors, be sure the leads are free
of the coating material where they emerge from the
resistor body. Be careful not to overheat the pins,
or the plastic base will melt.
R=2.83 x10™ -356 x 10?xfc
198 x10* xfc-1.59 x106
2. Mid-high filter:
R«= 479 x10" -6.02 x10?xfe
3.21 x10* *le-1,59 x107
OUTPUT TRANSFORMERS
The outputs of the XEQ-3 can be transformer coupled by
adding the optional TRB-2 set of three transformers to the
circuit board. This should be done by aqualified service
technician. Remove two screws from each side and the
back, and lift off the top cover. Then remove the five
screws holding the circuit board to the chassis, and four
hex screws from the front panel. The circuit board, with
the front panel attached, can then be removed from
the chassis.
Thre are fourteen jumpers which must be removed from
the board so that the three transformers will have the
proper drive, feedback, and output connections. The
jumpers are labeled JP1 through JP14. See Figure 9. To
remove ajumper, clip the lead at each end and remove
the center section.
4. Check all connections and resistor values.
5. Attach the cap with glue.
6. Label the module.
The transformer lead layout is asymmetrical, so verify the
orientation of the transformer leads with the holes in the
circuit board before installing. Solder all connections on the
foil side of the board. Reassemble the XEQ-3 in reverse
order from the description above.
five

DELAY
IN
MILLISECONDS
DEI
AY
IN
MILLISECONDS
XEQ-3 SERVICE MANUAL Figures
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POSITIONS OUTPUT RESPONSE
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FIGURE 1—Dimensions
NORMAL
(BOTH OUT)
LOW VMIO
AYUGH
A
LOW-HIGH LOW Z
/VI
D
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Yhigh
\
LOW-MID LOW YMl°
A/HIGH
/MIO /HIGH
FIGURE 6—Switching for Two-Way Operation
FIGURE 2—XEQ-3 Crossover Block Diagram
FIGURE 7—Low-Frequency Equalization Module Assembly
'^9’®F«i5te3f)i til
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FIGURE 3—Typical Crossover Curve
PtCAL CONTROL_
SETTINGS 11
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RESISTORS -
FIGURE 8—Crossover-Frequency Modification
Aim 1—]00 Ili 111 It ..I 1I.f
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FIGURE 4—Low-Frequency Time Delay
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FIGURE 5—Mid- and High-Frequency Time Delay
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FIGURE 9—Transformer Mounting Locations. Jumpers to
Cut are Shown as Solid Rectangles.
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XEQ-3 SERVICE MANUAL
LINKWITZ-RILEY FILTER ADVANTAGES
All contemporary crossover designs maintain predictable
acoustic summing in the horizontal plane with vertically
aligned system configurations However, in the vertical
plane, common Butterworth designs exhibit aphenomenon
termed “lobing error" caused by the 90-degree phase shift
of outputs and the 3-dB attenuation at crossover. To
explore the implications of lobing error, the following text
examines the radiation patterns of systems using a
Butterworth filter (Figure 10) and alinkwitz-Riley filter
(Figure 11).
In Figure 10, the cancellation axes result from the same
acoustic signal of two physically diplaced sources arriving
out of phase at discrete locations. Consider atypical
system with ahorn/driver combination in vertical alignment
with alow-frequency system. For locations above or below
the system axis, acoustic signals at crossover frequency
will arrive from the horn and woofer at different times (due
to the path-length differences), resulting in a"phase
cancellation" at discrete locations The peaking axis
represents the discrete locations where the two transducers
are exactly in phse and combine to produce a+-3-dB
peak relative to the on-axis level. As phase cancellation is
frequency dependent, changing the crossover frequency
will alter the axis orientation.
Lmkwitz-Riley filters are termed “zero lobing error"
because the unvoidable cancellation axes are placed
symmetrically above and below the system axis. Also, the
system on-axis response is “flat" with no off-axis
response peaks.
In Figure 11, the Linkwitz-Riley filter does not eliminate the
cancellation axis; again, this is purely afunction of two
displaced sources reproducing acommon frequency.
However, from adesign standpoint, the lobes are now
placed in amuch more manageable position—consider a
typical system orientation with respect to aseating area
Commonly, the system is aimed near the center of the
Linkwitz-Riley Filter Advantages
seating bank. From Figure 10, it is obvious that aseating
section below the system will experience a“hot spot"
produced by the peaking lobe of asystem using a
Butterworth-design crossover filter Also, aseating area
above the system axis will experience a"dropout" caused
by the interference along the upper cancellation axis. In
contrast, consider the same conditions using aLinkwitz-
Riley crossover filter.
With Linkwitz-Riley filter characteristics, there is no peaking
axis and. therefore, no "hot spots" referenced to the
system axis In the above example, the Linkwitz-Riley
cancellation axes are located at ±30 0relative to the
system As the vertical coverage pattern of common high-
frequency horns is 40° (±20°), the cancellation axes are
located beyond the designed coverage area in single
horn/driver systems. Recall from Figure 10 that one
cancellation axis for aButterworth filter is located within the
coverage pattern of typical horns.
From the above examples and illustrations, it clear that
Linkwitz-Riley filter characteristics offer the sound-system
designer distinct advantages, as opposed to Butterworth
designs, for electronic crossovers. In summary, Linkwitz-
Riley filters produce no off-axis response peaks and place
the inevitable cancellation axes symmetrically above and
below the system axis for smoother overall frequency
response in the crossover region.
Amore detailed and graphic treatment of the subject is
available in anumber of technical articles, including:
1. SHLinkwitz. "Active Crossover Networks for
Noncoincident Drivers," J. Audio Eng. Soc.,
vol 24, pp. 2-8 (1976 January/February).
2. SP. Lipshitz and J. Vanderkooy, "A Family of Linear-
Phase Crossover Networks of High Slope Derived
by Time Delay," J. Audio Eng Soc., vol. 31 pp 2-20
(1983 January/February),
FIGURE 11 —Combined Acoustic Output
Using Linkwitz-Riley Networks
seven

tyj XEQ-3 SERVICE MANUAL PC Board
elaht

ty] XEQ-3 SERVICE MANUAL Schematic
nine

XEQ-3 SERVICE MANUAL Schematic
eleven

Parts List/Notes
XEQ-3 SERVICE MANUAL
TEOI'l LED S. VIRE S/A D7
311*11
HiKiUl liililtBlilM lUi
TUBING
JUMPER, ZERO OHM, 0.4' LG
KW--W')c| JUMPER, ZERD DHM, 0.6' lG
PC 3HARD
KNOB, BLACK, ROTARY
KvjHJ knob, black, push switch
ffT'Tl'lt.1 iitairiiniMafBiiTMfii
Kiita FUSE, 0.8 AMP, SLQ-BLa 240V
1303,22 FUSE. 0.175 AMP. SLQ-BLQV
KiiElil-EI LINE CORD. SJT (DOMESTIC)
1302118 T5
372117 TRANSFORMER, PGW£R (DOMESTIC VERSION) lT4
WITCH, 4P67, ROTARY, NOBLE SR5C346B25KC S1.S2
301023 SWITCH. DPDT, PUSH UN-OFF S3— S10
300136 SOCKET, PCB MOUNT, LEAD
300118 J3-J5
300113 CONNECTOR, MIC JACK, RA, ADC 4-24Q27-C150 J1
300101
J0C09 71Tf11nliTTiM TII iII Mfl 111WM
30C09eCONNECTOR, RECEPTACLE, 2PIN ,AMP
3G0020 CONNECTOR, PH3NU JACK. PT ANG, SMK SQ3081 J2
008073 LED, GREEN. Gl-211 DIO
008072 LED, yellow, Yl-212 D9
008064 LED, RED, T-l D8
008049 DIODE, SIGNAL. LN4447 D1-D6,D31-D13
D18.DI9
008022 DIODE, POWER, 1N40C2 D14-D17
007014 I.C., DUAL, QUAD, RC4136 A19
007013 IX. dual, 0pin, NE5532 A1-A8.A9-A13.A16-A18
007010 I.C, DUAl, 8PIN, LF353N A7,A8»AI4.A15
006051 TRANSISTOR. NPN, MPSB090 Q7.G9
006044 TRANSISTOR, PNP, TIP32 05
TRANSISTOR, NPN, TIP31
006042 TRANSISTOR, PNP, 2N4403
006004 TRANSISTOR, PNP. PN3645 Q4,Q6,08
005967 RESISTOR, 47meg. /-57., 1/4 W, C.F. R2C8
005951 II mill II nil HUB 111 —SEE NOTE 12
005928 RESISTOR, 12 OK, +/-5X 1/4 V, C.F, R125,R175,R226,R235
005922 RESISTOR, 68K, +/-5X 1/4 V. C.F. R257.R260
005921 RESISTOR, 62K. +/-5X 1/4 V, C.F. R234
RESISTOR. 33K. +/-5X 1/4 V, Ci\ R254
005911 ii inn ii ii mi in i— SEE NOTE 11
005909 RESISTOR. 20K. +/-SX 1/4 V. C.F. R202
BILl OF MATERIAL (CONTINUED
005906 RESISTOR, 18 K, /-5X 1/4 V, C.F. R201
005904 RESISTOR, 12 K, +/-5X 1/4 W. C.F. SEE NOTE 10
RESISTOR, 10 K, +/-5X 1/4 V. C.F.
RESISTOR, 5. IK, /-3X 1/4 V, C.F. SEE NOTE 8
Hk[:l:Cd RESISTOR, 2K, +/-57., 1/4 W. C.F. R200
WWW RESISTOR, I.2K, +/-5X 1/4 w, C.F.
RESISTOR, 220, */-SX 1/4 V, C.F
'LW-HcB RESISTOR, 100, /-5X. 1/4 w, C.F. SEE NOTE 7
RESISTOR, 10, 4* /-57., 1/4 W, C.F. R1.R140,R190,R244
i|.M:l>J RESISTOR, 3.3, +/-5Z, 1/4 V. C.F.
SEE NOTE 6
POTENTIOMETER, LOOK, 4GANG, BTAPER SEE NOTE 5
iiiii ii in in—1
RESISTOR, 44.2K. +/-1X t/4 V/, MET FILM R15.R25.R35.R45
B'lil-tW RESISTOR, 30.1K, +/-1X 1/4 V. MET FILM R16.R26.R36.R46
ESJil RESISTOR, 26.7K, +/-1X 1/4 V, MET FILM R55,R65,R75,R85
K'lUftl RESISTOR, 17.8K. /-IX 1/4 V. MET FILM R56J?66,R76,R86
EHstfcl RESISTOR, 16. 5K, +/-1X 1/4 V. MET FILM R14,R?4,R34,R44
RESISTOR. 14, 3K, +/-1X 1/4 V. MET FILM R54,R64,R74,R 84
RESISTOR, 10.7K, +/-1X 1/4 W, MET FILM R!3,R23,R33,R43
M4=S'MI RESISTOR, 5.76K, +/-1X 1/4 V, MET FILM R53,R63,R73,R83
005364 RESISTOR, 4.99K, +/-1X 1/4 V, MET FILM R10.R29
005363 RESISTOR. 3.2 4K, /-IX 1/4 V, MET FILM R6,R9,R18,R19,R28,R37
005362 RESISTOR, 2.00K, /-IX 1/4 W. MET FILM SEE NOTE 4
ii™ RESISTOR, 1,2 7K, /-IX 1/4 V, MET FILM R52,R62,R72,R82
EBgl IIMIMIIMI^M
!005359 RESISTOR. 1.15K, /-IX 1/4 V, MET FILM R7.R8,R20,R27
I2BS33HI-'--’r~;_£j i,
004702 CAPAC1TDR, 0.01 MFD, 250V, UL APPROVED C74
0042 16 CAPACITOR, 47 MFD. 25V. ELEC, NP. RAD SEE NOTE 3
004087 CAPACITCR, 0.01 MFD /- SO'/., 50V, CER 14-Jt :r*LF7iWcT»?:L HhT'T.'I
004084 CAPACITOR, 1500 PF, */- I0Z, 100V, CER
004080 CAPACITCR, 150 PF, /- lOZ, 100V. CER SEE NOTE 2
004022 CAPACITOR. 39 PF, +/- 107„ 50V, CER
003685 CAPACITOR. 470 PF
03330 CAPACITOR. 0.022 HFD,*/-IQX250V,MYLAR C76
li&hfcfcl SEE NOTE 1
003232 fmmmm\
krIC£rMHH
rntti-i CAPACITOR. 0.0047 MFD. +/-5X50V, MYLAR C12.C36
KTiWSfiHi K^nu.u.N.ii-«>tt7.a4A.-nw.mtC38-C41
003201 CiaClI,Cl3,C34,C35,C37
001617 CAPAC1TDR. 330 MFD, 50V, ELEC.ALUM RAD r;7,c78
BBI C83,C8i
CAPACITOR, 100 MFD, 35V, ELEOAIUM RAD C24,C48,C7[,C79,C80
'HtJ.U CAPACITOR. 22 MFD, 10V, ELEC, ALUM RAD C19.C4 3
ms* CAPACITOR, 470 MFD. 6.3V, ELEC,ALUM RAD C62
DESCRIPTION REFERENCE DCS.
BILL or MATFRIAL FOR QUE complete; unit
NOTES :
i. P/N 0C3273 REF. DES.
2. P/N 004080 RFF. DES.
3. P/N 004216 REF. DES.
4. P/N 005362 RFF. DES.
5. P/N 005513 REF. DES.
6. P/N 005621 REF. DES.
7. P/N 005B53 REF. DES. :
8. P/N 005894 REF. DES. :
9. P/N 005902 REE. DES. :
10. P/N 005904 REF. DES. :
11. P/N 005911 REF. DES. :
12. P/N 005951 REF. DES. :
13. FOR SCHEMATIC SEE EV
C22.C29-C32,C46,C55,C56,C64,C65,C70,C81 ,C82
C9.C20.C21 ,C23,C33,C44,C45,C47,C54.C63,C66,C67
C4.C1 8.C25-C27.C42.C49-C51 .C61.C68.C69.C72
H11,R21,R31.R41,R51,R61.R71,R81
R[109,1 13.1 17,1 21 ], R[159, 163.167, 171], R[2iO 214 218 2221
R2-R5.R1 08, R1 11,R1 12,R1 15.R1 16.R11 9.R1 20.R123
R126-R133,R158,R161,R162.R165,R166,R169.R170,R173.
R176-183,R209,R212.R213.R216.R217.R220,R221,R224,
R227.R228.R230-R233.R236.R237
R1 10.R1 14,R1 18.R1 22.R135,R137,R141.R160,R164,R1 68
R1 72.R185.R1 87.R191.R211 ,R215.R219.R223,R229,R240,
R243.R270
R100.R102,R138,R150.R152,R188,R203,R205 .R241.R255
R275.R277
R134.R136.R139.R184.R1 86.R1 89,R23B,R239,R242,R259
R253.R261 ,R272,R274,R276,R279
R1 03.R1 04.R153.R1 54,R206,R207,R250-R252.R256,R258,
R263-R265.R268.R269
R1 05.R107.R124.R155.R1 57.R174.R225
DRAWING NUMBER 301-11.
twelve

Plug-In
EQ
Modules
lor
XEQ-3
Electronic
Crossover
8/13/93
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Notes:
MTX-4A
HF
&
MF
topology
Is
slightly
different
—
Indicated
values
give
equivalent
results
with
XEQ-3
topology.
MTX-4A
LF
topology
is
sufficiently
different
from
the
XEQ-3
that
equivalent
values
don't
exist.
Use
EQMT2
LF
above.