APOGEE ACOUSTICS ORIGINAL ACTIVE CROSSOVER Owner`s manual

APOGEE ACOUSTICS INC.
DAX 3
Dedicated Active Crossover
Owner’s Manual
INTRODUCTION
The DAX 3 is a two channel Dedicated Active Crossover designed specifically to be used with the Apogee
Acoustics Diva, Duetta Signature, Caliper Signature, and Centaur Major speakers. It provides exceptional
tuning flexibility, which enables users to sculpt a tonal balance to meet their exact listening requirements. The
DAX will accommodate a wide range of preamplifier and amplifier characteristics.
Features of the DAX 3 include woofer and midrange/tweeter level controls, fine level adjust controls, and rake
angle level adjust controls. These controls facilitate ergonomic operation and easy adjustment. The rake angle
control provides proper integration of the speakers' midrange/tweeter transducers with the audio system and
listening environment. The DAX 3 is capable of operating with single-ended or fully balanced input-output
signal interconnects. Input impedance adjustment controls fine-tune the matching characteristics between
DAX 3 and most available pre-amplifiers. Selectable amplifier gain matching provisions ensure total system
compatibility.
INSTALLATION
WARNING: DISCONNECT ALL POWER AND CABLES TO THE DAX BEFORE MAKING ANY
ADJUSTMENTS!
1) DAX ADJUSTMENT SWITCHES (See Diagram #1)
Inside the DAX are two output printed circuit boards for the left and right channels. There are a number of
switches on each output board which are used to select gain settings for matching amplifiers with different
output levels, filter shapes for the selected Apogee loudspeaker, balanced or single-ended inputs, and various
input loading settings.
If your authorized Apogee dealer has already performed these adjustments for you, proceed to section 2.
REMEMBER!: WHEN ADJUSTING SWITCHES ON DAX OUTPUT BOARDS, CONCURRENT
CHANGES MUST BE MADE FOR LEFT AND RIGHT CHANNEL OUTPUT BOARDS!
Amplifier Gain Matching
Make sure that no cables, including power cord, are connected to the DAX.
Remove the top cover of the DAX main unit by removing ten machine screws with the allen wrench
provided. Viewing the printed circuit boards from the front of the DAX, 4 printed circuit boards wilt be
visible: two smaller printed circuit boards attached to the front panel and two output printed circuit boards,
one left channel, one right channel, attached to the rear panel.
Locate switch #6(SW6) & switch #7(SW7), towards the left center of the output boards (Refer to Diagram
1). These switches allow matching amplifiers with different gains. Please consult your power amplifier
manual or manufacturer for this information.
SW7 attenuates the woofer level in 1 dB steps from 0 to -6 dB. SW6 attenuates the midrange/tweeter level in
1 dB steps, as well. For example, if you are using a power amplifier with a 20 dB gain on the woofer and
another power amplifier with a 23 dB gain on the midrange/tweeter, you would attenuate SW6 to position
number 3 which corresponds to -3 dB.
Speaker Selection
Switch #3(SW3) is used to select the appropriate filter shape for one of the two available speakers. Please
check the inspection certificate in the DAX packing carton with the factory preset values to make sure you
received the correct speaker model selection. SW3, on the middle right edge of the printed circuit board, can
be toggled to the left for Speaker A or to the right for Speaker B. Refer to Table 1 for the Apogee speaker
designation depending on the two speaker choices received.
NOTE: This must be done for both output boards!
TABLE 1
Speaker Combination
Duetta/Diva
Caliper/Diva
Centaur Major/Diva
Speaker A
Duetta Signature
Caliper Signature
Centaur Major
Speaker B
Diva
Diva
Diva
Balanced or Single-ended Input
Switch #2(SW2) is used to select either balanced or single-ended (regular RCA) input. SW2 is located right
above SW3 on the right edge of the printed circuit board. Toggled towards the right, or nearest edge of the
board, selects the single-ended input. Toggled to the left, or away from the nearest edge of the board, selects
the balanced input.
Both single-ended and balanced outputs are operational at all times so any combination may be used.
Impedance Loading (See Table 2)
Switch #5(SW5) is used to select the input impedance loading for the single-ended input. Switch #1(SW1) is
used to select the input impedance loading for the balanced input. SW5 is located in the upper right hand
comer of the printed circuit board as you face the front of the DAX. The label is not visible on the printed
circuit board, as it is hidden under the switch. SW1 is located to the left of SW5. There are four small rocker
bars in the switch, labeled 1-4. Only one toggle position is used for each setting. Be sure the other switches
are OFF. The DAX is preset at the factory for 80,000 ohms, single-ended, and 10,000 ohms, balanced (All 4
rockers in the OFF position).
Consult the manufacturer of your pre-amplifier or signal source device to determine the impedance
loading that the device works best with. Most manufacturers have conducted extensive tests on the
effects of impedance loading and should be able to answer this question. Select an impedance loading
value equal to or greater than the manufacturer's recommendation. If you cannot obtain a satisfactory
recommendation, choose the highest impedance setting for use with tube equipment or mid-value setting
for solid state equipment..
TABLE 2
Switch #5(SW5), Single-ended
Switch #1(SW1), Balanced
Rocker #(ON)
#1
#2
#3
#4
#1-4 OFF
Rocker #(ON)
#1
#2
#3
#4
#1-4 OFF
Value
5,000 ohms
10,000 ohms
20,000 ohms
40,000 ohms
80,000 ohms
Value
600 ohms
1,200 ohms
2,500 ohms
5,000 ohms
10,000 ohms
2) Required Wiring Modifications to Apogee Loudspeakers for Use With DAX 3
The following speaker wiring changes must be performed to permit operation of the Apogee speakers
with the DAX active crossover. The wiring changes are simple and readily performed.
WARNING!: BEFORE MAKING ANY WIRING CHANGES, DISCONNECT ALL POWER TO
THE AUDIO SYSTEM.
DIVA (See Diagram #2)
The Diva is a three way speaker and the DAX is a two way active crossover. It is necessary to use the
standard Diva passive crossover for the tweeter. The tweeter HI, LOW, NORMAL switch remains active
while the rest of the switches are not.
The DAX comes with a modification kit for the Diva passive crossover when purchased for use with the
Diva. The kit includes (2) midrange coils designated "L5", (2) WHITE wires for woofer ground, (2)
GREY wires for midrange ground, a 3/8" socket wrench for removing the nuts on the binding posts, and
an allen wrench for removing the bottom cover of the passive crossover electronics box. If your Diva's
serial number is before #10360, a small amount of soldering is required and you will need at least a 40
Watt soldering iron to continue.
WARNING: IF YOU ARE NOT MECHANICALLY INCLINED, HAVE YOUR APOGEE
DEALER PERFORM THESE MODIFICATIONS.
Remove all speaker cables from the Diva passive crossover. Carefully turn the Diva passive crossover
upside down and remove the bottom cover by unscrewing ten machine screws with the alien wrench
provided. Refer to Diagram #2 regarding the following procedures. Table 3 summarizes terminal and
wire connections:
TABLE 3: DIVA
WOOFER(SPK)
MIDRANGE(SPK)
TWEETER(SPK)
Binding Posts
RED
RED
BLACK
RED
BLACK
Standard Wiring
(Passive X-over)
BLUE,
BLACK
YELLOW,
RED
RED,
L3,
YELLOW
GREEN,
L3
ORANGE,
L4,
PURPLE
GREEN
L4
Active Crossover
BLUE
L5
GREY
ORANGE
L4,
PURPLE
GREEN,
L4
BLACK
WHITE
WOOFER(AMP)
MIDRANGE/TWEETER(AMP)
Binding Posts
RED
BLACK
RED
BLACK
Standard Wiring
(Passive X-over)
L1
BLACK
ORANGE
(2) GREEN
Active Crossover
BLUE
WHITE
ORANGE
L5
GREEN,
GREY
Woofer Wiring:
a. Remove and insulate RED and YELLOW wires from WOOFER RED SPEAKER BINDING POST
and leave BLUE wire connected. Insulate wire with heatshrink tubing or electrical tape. Remove
heatshrink from other end of unconnected BLUE wire.
b. Remove and insulate solid copper L1 coil wire from WOOFER RED AMPLIFIER BINDING POST
and connect loose end of BLUE wire to WOOFER RED AMPLIFIER BINDING POST.
c. Remove and insulate BLACK wire from WOOFER BLACK AMPLIFIER AND SPEAKER BINDING
POSTS.
d. Connect WHITE wire included in the kit between WOOFER BLACK AMPLIFIER AND SPEAKER
BINDING POSTS.
Midrange/Tweeter Wiring:
a. Remove and insulate solid copper L3 coil, RED and YELLOW wires from MIDRANGE RED SPEAKER
BINDING POST.
b. Connect new midrange coil L5, included in the kit, between MIDRANGE/TWEETER RED AMPLIFIER
BINDING POST and MIDRANGE RED SPEAKER BINDING POST. [Use the short lead for the speaker
binding post and the long lead for the amplifier binding post.] Secure L5 to outer edge resistor bank, as
shown in Diagram #2, with two tie-wraps included in kit. Leave ORANGE wire connected.
c. Remove and insulate solid copper L3 coil wire and GREEN wire from MIDRANGE BLACK SPEAKER
BINDING POST. Remove and insulate short GREEN wire from MIDRANGE/TWEETER BLACK
AMPLIFIER BINDING POST. Leave long GREEN wire connected between MIDRANGE/TWEETER
BLACK AMPLIFIER BINDING POST and TWEETER BLACK SPEAKER BINDING POST.
d. Connect GREY wire included in the kit between MIDRANGE BLACK SPEAKER BINDING POST and
MIDRANGE/TWEETER BLACK AMPLIFIER BINDING POST.
e. For all Divas with serial numbers before #10360, resolder short ORANGE wire originating from
MIDRANGE/ TWEETER RED AMPLIFIER BINDING POST from LUG #6 of the BUSSBAR to LUG
#1 and #2 (Refer to Diagram #2).
f. Finally, cut the BUSSBAR with a heavy wire cutter between LUG #2 and #3. Make sure that there is a
good size gap between these two lugs so that they are electrically isolated.
DUETTA SIGNATURE
Remove the nameplate on the back of each speaker by removing four Phillips head screws at the corners.
The nameplate holds the speaker binding posts on which the speaker wire is connected.
TABLE 4: DUETTA SIGNATURE - INTERNAL WIRING
WOOFER(SPK)
MIDRANGE/TWEETER(SPK)
Binding Posts
RED
BLACK
RED
BLACK
Standard Wiring
(Passive Crossover)
HEAVY GAUGE
COPPER WIRE
BLACK,
GREY
PURPLE
BROWN,
LIGHT GAUGE
COPPER WIRE
Active Crossover
RED
BLACK
BLUE
BROWN
Woofer Wiring:
a. Remove and insulate solid copper wire from WOOFER RED BINDING POST.
b. Remove and insulate GREY wire from WOOFER BLACK BINDING POST. Resecure BLACK wire on
WOOFER BLACK BINDING POST.
c. Locate unconnected BLUE and RED wires coiled together. Remove the heatshrink from unconnected
RED wire and install on WOOFER RED BINDING POST.
Midrange/Tweeter Wiring:
a. Remove and insulate PURPLE wire from MIDRANGE/TWEETER RED BINDING POST.
b. Remove heatshrink from unconnected BLUE wire and install on MIDRANGE/TWEETER RED
BINDING POST.
c. Remove and insulate solid copper wire from MIDRANGE/TWEETER BLACK BINDING POST.
d. Re-secure BROWN wire on MIDRANGE/TWEETER BLACK BINDING POST.
Replacing Wires and Nameplates:
a. Check the wires and lugs to be certain that they do not short out to the nameplate or to each other. Be sure
that the wires are not sharply bent.
b. Use electrical tape or heatshrink tubing where instructions call for insulating a given lug or wire.
c. Place the nameplates back in their original positions and secure with screws.
CALIPER SIGNATURE
The Caliper Signature is not set-up to be easily modified by the customer. Therefore, we recommend that
your authorized Apogee dealer perform this modification.
CENTAUR MAJOR
Remove the nameplate on the back of each speaker by removing six Phillips head screws. The nameplate
holds the speaker binding posts on which the speaker wire is connected.
a. Loosen and remove the outer hex
nuts from the input binding posts. Do
this for red and black as well as for
woofer and midrange tweeter.
b. Remove all wires from binding posts.
c. Re-attach the BLUE wire to the
midrange tweeter black binding post.
Do the same for the free BLACK wire
(not to switch or main crossover board)
on the woofer black binding post.
d. Loosen and remove hex nuts from the main
crossover board as shown. Remove RED and
WHITE wires as indicated.
e. Attach RED wire from crossover board to red
woofer input binding post on input plate.
f. Attach WHITE wire from crossover board to
red midrange tweeter input binding post on input
plate.
g. Arrange all extra and unattached wires from
the crossover board or input plate neatly so it
will not rattle or cause any electrical shorts to
input plate.
h. Install input plates to speakers with Phillips
head screws.
3) Selecting a Location for Your DAX
The DAX has a separate power supply that should be located away from the main unit and any other signal
sources such as the preamp. Ideally, in order to minimize interconnect cable runs from your preamp to your
amplifiers, the DAX should be located fairly close to your power amplifiers, but not right on top or next to
them. However, the most obvious consideration in choosing a location is user accessibility.
The DAX should be kept away from stray magnetic fields which can be caused by A.C. outlets, televisions,
computers, and power supply transformers.
4) Input/Output Connections
The rear of the DAX is marked with left and right connections for both balanced and unbalanced
(single-ended) input and outputs. Either the balanced, unbalanced(single-ended) or a combination of the two
outputs may be used.
1. Main signal link
2. Output - Midrange/Tweeter
3. Output - Woofer
4. Power input connector
Notice that the balanced inputs are female and the outputs male. The vast majority of manufacturers with
balanced equipment use this convention. However, there does not seem to be any convention when it comes
to the wiring of the 3-pin XLR connectors. We have chosen pin #1 to be common, pin #2 to be the negative
signal, and pin #3 to be the positive signal. Reversing pin #2 and #3 is equivalent to an absolute phase
inversion.
MAKE SURE THAT ALL DAX XLR CONNECTORS ARE WIRED AS FOLLOWS:
PIN 1: COMMON (Shield)
PIN 2: NEGATIVE (LO) Signal
PIN 3: POSITIVE (HI) Signal
In the owner's manual for the Diva and Duetta Signature is a diagram showing two different configurations
for bi-amplification. Either Configuration A or B may be utilized. The selection of the most satisfactory
configuration is based on a number of system considerations such as the amplifier, interconnect and cable
characteristics and overall acoustic properties resulting from the selected configuration.
a. Connect preamplifier output to DAX INPUT. Connect DAX WOOFER OUTPUT to the woofer amplifier
input and DAX MIDRANGE/TWEETER OUTPUT to midrange/tweeter amplifier input.
b. Connect left channel woofer amplifier output terminal to the "Woofer" Amplifier Binding Post on the Diva
Electronics Box or on the Duetta Signature, Caliper Signature, or Centaur Major nameplates.
c. Connect left channel midrange/tweeter amplifier output terminal to the "Midrange/Tweeter" Amplifier
Binding Posts on the Diva Electronics Box or on the Duetta Signature, Caliper Signature, or Centaur
Major nameplates.
d. Follow same procedure for the right channel.
5) Power Supply Connections
Connect the 5 pin XLR with its umbilical cable attached to the power supply, to the connector marked
POWER in the middle of the DAX back panel.
Before plugging the power cord into an A.C. outlet, make sure the correct voltage setting is selected on the
back of the power supply. This is indicated on the bottom of the power supply and the packing carton.
To change the fuse or voltage selection, first, disconnect the power cord from the power supply chassis. To
gain access to fuse and voltage selector:
1. Locate power entry module on back of power supply. Using a small screwdriver at the left edge, pry
the fuse and voltage selector cartridge out from the power entry module.
2. Lift the black plastic locking tab at center of fuse and voltage selector cartridge and slide out the
clear plastic fuse holder. Replace fuse with only 250V, 0.5 amp, fast blow fuses.
3. Lift the second black plastic locking tab at edge of cartridge and slide out the green voltage sector.
This is difficult and may require the assistance of another person.
4. Rotate the green voltage selector until the desired voltage shows in the window and snap home.
Remember, there are only two useable voltage settings to chose from. These are listed on the bottom
of the power supply.
5. Re-insert fuse holder into cartridge. Insert cartridge back into connector housing.
WARNING!
TO AVOID SERIOUS ELECTRICAL SHOCK, DO NOT REMOVE THE COVER OF THE
POWER SUPPLY WHILE IT IS PLUGGED IN. THERE ARE NO USER SERVICEABLE
PARTS INSIDE.
TURN THE DAX ON BEFORE TURNING ON THE AMPLIFIERS! THIS PREVENTS
ANY TRANSIENTS THAT MAY DAMAGE THE RIBBONS AND YOUR SYSTEM.
FRONT PANEL CONTROLS
On the DAX front panel are eight control knobs. Included are left and right WOOFER and
MIDRANGE/TWEETER attenuation, left and right WOOFER – MIDRANGE/TWEETER FINE
BALANCE, and left and right RAKE ANGLE knobs.
1) Woofer and Midrange/Tweeter Attenuation:
The woofer may be attenuated in 1 dB steps from 0 to -6 dB by turning the WOOFER knob
counter-clockwise. The numeric indication near the knob will indicate the corresponding level. The
MIDRANGE/TWEETER knob operates in the same fashion.
2) Fine Tuning
If smaller attenuation increments of 0.2 dB are desired, turn the Fine Tuning in the direction of the Woofer
or Midrange/Tweeter symbol to further attenuate that frequency band in 0.2 dB steps. For example, you wish
to attenuate the right woofer -2.2 dB. Simply turn the right (you will see a little R on the far right edge of the
front panel) WOOFER attenuation knob two clicks to the left (counterclockwise) and then turn the right Fine
Tuning knob one click to the left (counterclockwise). Note that the Fine Tuning adjusts either the Woofer or
Midrange/Tweeter levels, not both at the same time.
3) Rake Control Angle:
The RAKE control angle knob adjusts the tonal balance above 1 kHz in a linear fashion. It is easy to
visualize this as a hinging action at various angles. + 1 corresponds to a 1 dB boost referenced at 5 kHz,
hinged at 1 kHz. There are +/- 4 steps, each step is equivalent to a +/- 0.5 dB step at 5 kHz. This feature
allows the user to tone dawn bright recordings or liven up dead listening rooms and vice-versa.
Experimentation is recommended.
CARE AND CLEANING
WARNING: BEFORE CLEANING, SHUT OFF ALL POWER.
The DAX and its power supply have a high quality anodized finish. This finish is durable against most
scratches and rub marks. Fingerprints and dirt are best removed by a glass cleaner or mild soap and water.