Altair FA-524 User manual

FA-524/FA-724
OWNERS MANUAL
ACTIVE CROSSOVERS
EQUIPOS EUROPEOS ELECTRÓNICOS, S.A.L.
AVDA. DE LA INDUSTRIA, 50. 28760 TRES CANTOS (MADRID)
91-8043265 91-8044358 [email protected].
www.altairaudio.com
ALTAiR

CONTENTS
1. SWITCHES, CONTROLS, ADJUSTMENTS AND CONNECTORS 4
FRONT PANEL 4
REARPANEL 5
2. WORKING PRECAUTIONS 6
3. INSTALLATION 6
CHANGINGTHEVOLTAGE 6
CHANGING THE FUSE 6
CONNECTION TO THE MAINS 7
INPUT CONNECTION 7
OUTPUT CONNECTION 8
GROUND LINK 9
4. OPERATION 10
MODES OF OPERATION 10
LEVELCONTROL 11
SIGNAL, THRESHOLD AND OVERLOAD INDICATOR 11
MUTE 12
PHASE SWITCH 12
PHASE ADJUSTMENT BETWEEN WAYS 12
5. OPTIONS 13
FREQUENCY CARD (TC-66) 13
EQUALIZER CARD (TE-67) 13
DELAY CARD (TD-69) 13
SECURITY COVER (TP-1) 14
LOCKABLE SECURITY COVER (TS-1) 14
6. SPECIAL OPERATIONS 14
FREQUENCY CARDS 15
FREQUENCYCARDCONFIGURATION 15
OVERLAPPEDFREQUENCYCARDCONFIGURATION 19
PLACING A FREQUENCY CARD 19
MODES OF OPERATION CONFIGURATION 20
THREE STEREO WAYS (ONLY FA-724) 20
TWO STEREO WAYS 20
SIX MONO WAYS (ONLY FA-724) 21
FIVE MONO WAYS (ONLY FA-724) 21
FOUR MONO WAYS 21
THREE MONO WAYS 22
LIMITER ADJUSTMENT 22
EQUALIZERCARD 23
EQUALIZER CARD CONFIGURATION 24
GAINCALCULATION 24
FILTER FREQUENCY CALCULATION 25
BANDWIDTH CALCULATION (Q) 26
BAND GAIN VARIATION 27
NONSTANDARDEXAMPLESCONFIGURATION 28
2

3
PLACING AN EQUALIZER CARD 29
DELAYCARD 30
DELAY CARD CONFIGURATION 30
PLACING A DELAY CARD 31
7. BLOCK DIAGRAM AND OPERATION EXPLAIN 32
8. REPAIR GUIDE 35
9. TECHNICAL SPECIFICATIONS 37
10. GRAPHS 38
11. WARRANTY 39

1. SWITCHES, CONTROLS, ADJUSTMENTS AND CONNECTORS
These are the switches, controls, adjustments and connectors that you could find in your crossover ALTAIR. The description and explana-
tion of each one of them, you will find in the corresponding section.
FRONT PANEL
LEVEL CONTROL. PHASEADJUSTMENTBETWEENWAYS.
SIGNAL, THRESHOLD AND OVERLOAD INDICATOR. TURNONANDOPERATIONMODE(STEREO/MONO)INDICATOR.
MUTE (WITH INDICATOR LED). POWER SWITCH.
PHASESWITCH.

REARPANEL
MAINSCONNECTORANDFUSEHOLDER. OUTPUTCONNECTOR.
VOLTAGESELECTOR. INPUTCONNECTOR.
EARTH LINK SWITCH.

2. WORKING PRECAUTIONS
The manufacturer is not made responsible of any damage occurred in the
crossover unit outside the limits of the warranty or that had been produced by not
keeping in mind the working precautions.
First at all, make sure that the mains voltage to which the crossover is to be
connected is the same that the voltage selector setup placed at the crossover rear
panel
DANGER: In the crossover unit there is high voltages, doesn't open it. The
crossover unit doesn't contain elements which could be repaired by the user.
Whenever crossover unit is connected to the mains, contains elements with high
tensions. In order to disconnect the crossover unit completely, you must disconnect
it of the mains.
Protect the crossover unit of the rain and humidity. Make sure of that no liquid
or object introduces in their interior. If a liquid is poured over the crossover unit,
disconnect it of the mains and consult a qualified technical service.
Don't place the crossover unit near heat sources.
3. INSTALLATION
CHANGINGTHEVOLTAGE
The crossover unit is set to operate at 230V, 50-60Hz and at 115V, 50-60Hz.
Make sure that the crossover unit is disconnected of the mains.
Set up the voltage selector, placed at the crossover rear panel, in the position
that shows the voltage which you want to connect it.
Crossover set up 115 V.
Crossover set up 230 V.
Make sure that the fuse is the right one for the selected voltage:
T1A ---------> 115V.
T0,5A ----------> 230V.
CHANGING THE FUSE
The crossover unit is factory set up with a T0,5A FUSE, adequate in order to
work with a mains of 220-240V, 50-60Hz.
1
2
3
6

7
Make sure that the crossover unit is disconnected of the mains.
In the crossover rear panel, is placed the mains connector and the fuse holder. The box
bellow this mains connector is called fuse holder. Take out the fuse holder.
Upon extracting the fuse holder, the fuse will appear, take out it and change for the new
one.
Insert the fuse holder into the mains connector again.
CAUTION: Always make sure upon changing the fuse, of that is the adequate for the se-
lected mains voltage (T1A for 115V and T0,5A for 230V).
CONNECTION TO THE MAINS
The connection of the crossover power supply to the mains takes place by a tripolar
cord provide by the factory.
Make sure that the crossover power switch, is at position 0 (turned off).
Insert the female connector of the tripolar cable into the crossover power
supply male connector, placed at the rear panel.
Insert the male connector of the tripolar cable into the mains plug.
Turn on the crossover power switch. In that moment the MODE LED
indicator will light, indicating that the crossover is turned on.
CAUTION: Make sure that the mains tension to the one which is going to
connect the crossover unit is correct, as well as their fuse is the adequate.
INPUT CONNECTION
The crossover signal input, is carried out through two XLR-3-31 females connectors, one
per channel. The input connections are balanced, with a nominal impedance of 20 KΩ(10
KΩunbalanced).
2
1
4
3
1
4
3
2

The following pictures shows some of the different possibilities of connection, relying on
the type of input signal, balanced or unbalanced and according to the ground configuration
of the equipment (floating or ground-referenced).
UNBALANCED INPUT: This type of connection will be used when the sound source doesn't
provide of balanced output. If it is possible, will be employed the connection type 1.
1) Using twin-lead shielded cable:
2) Using single conductor coax cable:
BALANCED INPUT:
OUTPUT CONNECTION
The crossover output signal is carried out through XLR-3-32 males connectors, one per
way (7 for the model FA-724 and 5 for the model FA-524). The outputs are balanced, with a
nominal impedance of 100Ω.
CROSSOVER
UNIT
+
-
+
SOUND
SOURCE
+
+-CROSSOVER
UNIT
Floating sound source ( / ) : Close.
Ground-referenced sound source ( / ) : Open.
Floating sound source ( / ) : Close.
Ground-referenced sound source ( / ) : Open.
SOUND
SOURCE
+
-
CROSSOVER
UNIT
SOUND
SOURCE
-
+
Floating sound source ( / ) : Close.
Ground-referenced sound source ( / ) : Open.
8

9
The following graphics shows some of the different possibilities of connection, relying
on the type of the power amplifier input signal, balanced or unbalanced and according to
the ground configuration of the equipment (floating or ground-referenced).
UNBALANCED OUTPUT: This type of connection will be used when the power amplifier
doesn't provide of balanced input. If it is possible, will be used the connection type 1.
1) Using twin-lead shielded cable:
2) Using single conductor coax cable:
BALANCED OUTPUT:
GROUND LINK
In some installations, it might be necessary to isolate the crossover electric ground, from
the system mains earth, in order to avoid ground loops, that could generate unwanted
noises, for this reason, the crossover provides an EARTH-LINK switch placed at the rear panel
in order to lift the mains earth from the crossover electric ground.
CROSSOVER
UNIT
POWER
AMPLIFIER
CROSSOVER
UNIT
POWER
AMPLIFIER
+
Floating power amplifier ( / ) : Close.
Ground-referenced power amplifier ( / ) : Open.
+
Floating power amplifier ( / ) : Close.
Ground-referenced power amplifier ( / ) : Open.
CROSSOVER
UNIT
POWER
AMPLIFIER
Floating power amplifier ( / ) : Close.
Ground-referenced power amplifier ( / ) : Open.
+
-

MAINS EARTH LINKED WITH THE CROSSOVER ELECTRIC GROUND
MAINS EARTH LIFTED FROM THE CROSSOVER ELECTRIC GROUND
CAUTION: Sometimes, lifts the mains earth, using a ground-lift connector,
the one which undoes the ground loop also, but this is very dangerous,
since if for any circumstance part of the mains signal is derived to the
chassis, could cause a short-circuit through our body, upon having elimi-
nated one of the working precautions of the unit. For this circumstance,
NEVER lift the mains earth (lift the crossover EARTH-LINK switch) in order to
avoid possible accidents.
4. OPERATION
The crossover utility, is divide the audible band (20Hz to 20KHz) in smaller bands,
whose sum restores the audible band again. Once separate and tried meetly, the different
bands are amplified and reproduce for separating giving a multiamp system like result. This
division is carried out so that the different cabinet ways only receives the part of the band that
they are capable of reproducing, avoiding possible breaks, and an unnecessary warming up,
and so that the power amplifiers only amplify the signal that is going to reproduce the cabinet
way that are feeding, avoiding that unnecessarily warms, amplifying signals that are not been
going to reproduce.
MODES OF OPERATION
The crossover can be configured as either a stereo mode or mono mode. The
crossover configuration is shown in the front panel of the unit by the MODE LED
indicator (STEREO / MONO).
In STEREO mode operation, will provide of two totally independent crossover channel
inputs, with 2 or 3 ways for the FA-724 and 2 ways for the FA-524.
In MONO mode operation, will only have one input channel: CH1 (the channel CH2 will
be disabled, for the one which any signal that inserts in it, will be lost, since it won't appear in
the output), and of 4, 5 or 6 ways for the FA-724 and 3 or 4 ways for the FA-524.
Besides these mentioned ways, exists an additional subwoofer mono way (SW), whose
signal will be the sum of the input channels CH1 and CH2 in stereo mode, and the input
channel CH1 in mono mode. It is important emphasize that in stereo mode, this output upon
adding the signals of the input channels CH1 and CH2, if only inserts signal for one of the
input channels, will only have the half of the signal in the output.
The following table list the possible configuration of the crossovers FA-724 and FA-524:
MODEL STEREOMODEMONOMODESUBWOOFER
OUTPUT
THREE
WAYS TWO WAYS SIX WAYS FIVE WAYS FOUR WAYS THREE WAYS
FA-524 YES YES YES YES YES YES YES
FA-724 NO YES NO NO YES YES YES
10

11
On the other hand, the following table show the output configurations in the different modes
of operation and their correspondence with the crossover printed rear panel:
MODEFA-524 FA-724
COMPONEN
OVERLAY CH1 LOWCH1 HIGH CH2 LOWCH2 HIGH CHI LOWCH1 MIDCH1 HIGH CH2 LOWCH2 MIDCH2 HIGH
STEREO
THREE WAYS -- -- -- -- CH1 LOW CH1 MIDCH1 HIGH CH2 LOW CH2 MIDCH2 HIGH
STEREO TWO
WAYS CH1 LOW CH1 HIGH CH2 LOW CH2 HIGH CH1 LOW CH1 HIGH F.R. CH2 LOW CH2 HIGH F.R.
MONO SIX
WAYS -- -- -- -- LOW MID1MID2MID3MID4HIGH
MONO FIVE
WAYS -- -- -- -- LOW MID1MID2MID3HIGH F.R.
MONO FOUR
WAYS LOW MID1MID2HIGH LOW MID1MID2HIGH F.R. F.R.
MONO THREE
WAYS LOW MIDHIGH F.R. LOW MIDHIGH F.R. F.R. F.R.
NOTE:F.R.istheabbreviation ofFULL RANGE.
LEVELCONTROL
Each one of the crossover ways provides a gauged level control between ±6 dB,
placed at the front panel. Notice that when this level control is placed in - 6 dB position
doesn't disappear the output signal.
These controls are designed in order to allow the level calibration of each way with
theothers.
Due to that the control of level is placed before the limiter (as seen in the block diagram), the
output level depend on the calibration of the limiter.
SIGNAL,THRESHOLDANDOVERLOADINDICATOR
The crossover has an indicator of signal, threshold and overload for way. This indicator
isatricolorLEDplaced at thecrossoverfrontpanel.
When the indicator is green, the output signal has overcome -20 dBv. Upon lighting the
indicator in color amber will have overcome the limiter threshold defined, and therefore is begin-
ning to limit, whenever is active. Upon passing the indicator to red color will know that there is
overload, that is to say, in any point of signal path the limit of security of 15 dBv has been sur-
passed. In order to correct this problem, should lower the level of that way or decrease the input
signal.
LEVEL INDICATOR
LIMITERONLIMITEROFF
GREEN ORANGE RED GREEN ORANGE RED
Signal is present at
a level of -20 dBv. The signal has reached the limiter
threshold setting.
The signal stars to
saturate (intenal
clip) (+15 dBv).
Signal is present at
a level of -20 dBv. -- The signal starts to saturate (internal
clip) (+15 dBv).

MUTE
Each crossover way provides of a mute switch in order to could cancel this way.
When this switch is pulsed, the corresponding way remains canceled, and lights a red
indicator associate to this switch. This switch is very useful to verify each one of the
ways for separating, cancelling all the ways less the one which is wanted to test.
The crossover muted all the ways when power is turned on, during a few seconds, in
order to protect the loudspeakers of turn on transitory and avoid unwanted noises. This one
could verify turning on the unit, and seeing that the mute indicators remains lit during a few
seconds.
PHASE SWITCH
This switch placed in the front panel of the crossover, allows to change the phase
of the way associated to it in 180º concerning their high way. The two more important
utilities of this phase switch are for the compensation of the phase change upon using
two different equipment, due to the wiring or the design of their different components,
and in second place in order to balance the phase change between two adjacent
ways, improving it of this manner the acoustical summation of the two ways. This last
utility takes place in conjunction with the phase adjustment, of the that will talk later on.
PHASE ADJUSTMENT BETWEEN WAYS
The phase adjustment between ways takes place through a rotatory potentiom-
eter placed at the front panel of the crossover. The configuration of this phase adjust-
ment is placed at the frequency card to obtain a precise control of 0 to 180º on the
relevant frequency. If used it in conjunction with the phase switch, will provide of a
phase adjustment of 0 to 360º.
The filters used in crossover unit (LINWITZ-RILEY), secures that in the relevant frequency
the two adjacent ways are in phase, however the differences between the loudspeakers in
the adjacent ways, makes that is very useful provide of a phase adjustment between ways.
The process recommended in order to carry out the adjustment phase in all the bands,
is leave the HIGH way of the crossover as reference, and go adjusting the phase succes-
sively, until reach at the LOW way.
Three simple methods in order to carry out the adjustment phase are:
1º) Using a spectrum analyzer and pink noise, until obtain the flattest frequency re-
sponse of the equipment.
2º) Applying a sinewave signal at the relevant frequency, and adjusting the phase
potentiometer of the way with lower frequency until the output signal achieves to the mini-
mum (cancellation) and then press the phase switch of the way with lower frequency.
3º) Listening the speaker system.
It is important point out that this adjustment is thought in order to regulate the phase
between the ways, and not as delay (except for the subwoofer output), in order to it is avail-
able an optional delay card, of the one which will talk later on.
In the subwoofer way the phase adjustment produces a adjustable delay until 6 ms
(200 cm) valid from 20 to 100 Hz (to high frequencies the delay begins to diminish). In order to
obtain the better phase alignment between the low and subwoofer ways is recommended
place the subwoofer cabinets in a more advanced position that the low one for so have a
margin of possible delay in the subwoofer way.
12

13
5. OPTIONS
In this section will explain the different available options for the crossovers FA-524 and
FA-724.
Each crossover way provides of two insertion points, in those that could insert equalizer
cards or delay cards. Upon providing of two insertion points, each way could provide of two
equalization points, or a equalization point and a delay (The delay card only could insert in one
of them, for the one which could not provide of two delay points).
FREQUENCY CARDS (TC-66)
Each frequency card provides of two filters, one high pass and another low pass, that
defines the relevant frequency between two ways, with a slope of 24 dB/ octave LINKWITZ-
RILEY type. The relevant frequency attenuation is 6 dB. The crossovers are given with the
standard relevant frequencies that are shown in the following table:
STANDARD RELEVANT FREQUENCIES PROVIDE BY FACTORY
WAY FREQUENCIES
SUBWOOFER (SW) 82Hz,100Hz,120Hz,150Hz.
OTHER WAYS 100Hz, 120Hz, 150Hz, 180Hz, 220Hz, 270Hz, 330Hz, 390Hz, 470Hz, 560Hz, 680Hz,
820Hz, 1KHz, 1K2, 1K5, 1K8, 2K2, 2K7, 3K3, 3K9, 4K7, 5K6, 6K8, 8K2.
The supply of any other relevant frequency that the specified will be an option previous
consults to the commercial department.
EQUALIZER CARD (TE-67)
In certain installations it is advisable insert equalization points in order to improve the
system frequency response, for which the crossover provide an optional equalizer card.
Inserting an equalization directly in the crossover is cheaper than utilize an graphic equal-
izer, and also avoids unwanted manipulations .
The optional equalizer card provides a full parametric equalization point, for the one
which could define the three variables that setup a equalization point: gain, bandwidth and
center frequency.
Could provide of two equalization points for way how maximum, installing two equal-
izercards.
DELAY CARD (TD-69)
Sometimes are necessary establish a delay between ways, in order to balance the
delays produced in them due to the design of the cabinets, and so improve their phase
coherence. For it the divisors provide of an optional delay card.
The optional delay card configuration could request of 2 ms (70 cm), valid until 2 KHz
and of 500 µs (17 cm), valid until 8 KHz. At high frequencies, the card is still working, but the
time delay decreases progressively.
The delay card of 2 ms. provides seven steps of 250 µs (8,75 cm) and 62,5 µs (2,12 cm)
for the 500 µs one and a adjustable linear step through a potentiometer of 0 to 250 µs for
the 2 ms delay card and of 0 to 62,5 µs for the 500 µs one.

SECURITY COVER (TP-1)
In some installations it is necessary avoid unwanted manipulations of the crossovers
controls, for which it is available a security cover that avoids the access to the crossovers
controls.
The installation is very easy, by means of two screws provided with the security cover
binds at the front panel, the which has been two threaded holes for this purpose.
LOCKABLE SECURITY COVER (TS-1)
In some installations it is necessary isolate the crossovers controls with high safety that
the which offers the security cover, for the one which it is available a lockable security cover
of easy installation. The lockable security cover is provided with two keys.
6. SPECIAL OPERATIONS
In order to setup some of the crossover possibilities it must be open, removing the eight
screws of their top cover.
NOTE: This type of operations, takes place with the unit open, because of what should be
carried out by qualified technical personal.
WARNING: Before opening the unit, disconnect it of the mains. It is important mark that al-
though the unit is turned off (with the power switch at position 0), if it continues connected to the
mains there is different parts of the unit that are subjected to high tension.
CAUTION: Don't subject the crossover unit to rain or humidity, above all if it is open. If it comes
to produce, disconnect it of the mains and warns a qualified technical service.
How you could note, the different ways are equal, for the one which the localization of a
certain component is easy, since although we locate the another way one, will give us a
comparative position of the component in order to find it in the way that we are interested in.
In each box we will be provided of a main board components amplification that corre-
sponds to the operation that we are explaining, but sometimes for the general localization in
the unit is important to provide the complete main board components picture.
The component are identified by a word and a number. The word indicates the kind of
component to the that we referred (Ejm: R23 is a resistance), and the number their comparative
position in the circuit, beginning for the upper left corner and toward down.
14

15
FREQUENCY CARDS
In the frecuency cards we can configured the cut frequency of the highpass and
lowpass filters (normally equal, although they could be different if you want overlap ways),
the attack time, the release time, and the phase adjustment.
The following picture shows the frequency card components, in which you could seen
the different regions that we previously have been made reference:
HIGHPASS LOWPASS
How you could observe in the frequency card components picture, it is divided funda-
mentally in two parts, a highpass filter ( ), and a lowpass one ( ). The resistor arrays
R2 and R3 and the capacitors C7, C8, C9 and C10 belongs to the highpass filter and the
resistor array R1 and the capacitors C1, C2, C3, C4, C5 and C6 belongs to the lowpass filter.
The high pass and loww pass filters are normally configured with the same cut fre-
quency, however in the cases that require overlap bands they should be different. Remem-
ber always that the lowp ass filter belongs to the way located to the left, and the high pass
filter to the way located to the right of the frequency card, looking at the crossover from the
frontal.
FREQUENCYCARDCONFIGURATION
The filters configuration depend on the capacitors and resistor arrays value. The ca-
pacitors are soldered to the frecuency card, and the resistor arrays provide of a socket, in
order to could change them easily. In order to insert a resistor array in the frequency card,
you make coincide the dot that has the resistor array in a lateral, with the dot placed in the
frecuency card components picture, and locating the pins of the resistor array over the
socket, push down.
Sometimes it won't be possible to find a resistor array of a certain value. If this occurs, it
is possible substitute the resistor array by discrete resistors, all of the same value locating
them according to show the next picture:

16
The ATTACK and RELEASE resistors are present in the frequency card, which define the
limiter times of attack and release of the way placed at left of the frequency card, looking at
the crossover from the frontal. The last way, upon not providing of these resistors in the
frequency card, it has them in the main board:
MODEL WAY —»HIGH R
ATTACKRELEASE
FA-724 R379 R389
FA-524 R326 R336
Also one must highlight that the phase adjustment configuration corresponding to the
way located at left of the frequency card, looking at the crossover from the frontal, is placed
in the frequency card. This is a capacitor and comes numbered as:∅.
In order to setup the frequency card like bypass, will remove the integrated circuit U1,
and the resistor arrays R1, R2 and R3 of the frequency card, and will place the links BYPASS_1,
BYPASS_2, BYPASS_3 and BYPASS_4. Don't forget to leave the ATTACK and RELEASE resistors
and the capacitor∅ in the frequency card, since these define the attack and release times,
as well as the phase adjustment of the way located at left of the frequency card looking at
the crossover from the frontal:
The frequency cards are placed in the connectors J3, J6, J9, J12, J15 and J18, witch
correspond with the numbers 1,2,3,4,5 and 6 of the main board.
In the next table could be found the most of the frequencies that one could define in the
frequency card:

* FREQUENCY CARD GENERAL TABLE
FREQUENCY LOW PASS FILTER HIGH PASS FILTER ATTAC RELEAS ∅∅
C1,C2,C3
C4,C5,C6 R1 C7,C8 C9,C10 R2,R3
10 Hz 330nF 33K 330nF 34K 220K 150K 220nF #
11 Hz 330nF 30K9 (1%) 330nF 30K9 (1%) 220K 150K 220nF #
12 Hz 330nF 27K 330nF 27K 220K 150K 220nF #
13 Hz 330nF 26K1 (1%) 330nF 26K1 (1%) 220K 150K 220nF #
15 Hz 330nF 22K 330nF 22K 220K 150K 220nF #
16 Hz 330nF 21K5 (1%) 330nF 21K5 (1%) 220K 150K 220nF #
18 Hz 330nF 18K 330nF 18K 220K 150K 220nF #
20 Hz 330nF 16K9 (1%) 330nF 16K9 (1%) 220K 150K 220nF #
22 Hz 330nF 15K 330nF 15K 220K 150K 220nF #
24 Hz 330nF 14K3 (1%) 330nF 14K3 (1%) 220K 150K 220nF #
27 Hz 330nF 12K 330nF 12K 220K 150K 220nF #
30 Hz 330nF 11K3 (1%) 330nF 11K3 (1%) 220K 150K 220nF #
33 Hz 330nF 10K 330nF 10K 220K 150K 220nF #
36 Hz 330nF 9K53 (1%) 330nF 9K53 (1%) 220K 150K 220nF #
39 Hz 330nF 8K2 330nF 8K2 220K 150K 220nF #
43 Hz 330nF 7K87 (1%) 330nF 7K87 (1%) 220K 150K 220nF #
47 Hz 330nF 6K8 330nF 6K8 220K 150K 150nF #
51 Hz 330nF 6K65 (1%) 330nF 6K65 (1%) 220K 150K 150nF #
56 Hz 330nF 5K6 330nF 5K6 220K 150K 150nF #
62 Hz 330nF 5K49 (1%) 330nF 5K49 (1%) 220K 150K 150nF #
68 Hz 330nF 4K7 330nF 4K7 220K 150K 150nF #
75 Hz 330nF 4K53 (1%) 330nF 4K53 (1%) 220K 150K 150nF #
82 Hz 330nF 3K9 330nF 3K9 220K 150K 100nF #
91 Hz 330nF 3K74 (1%) 330nF 3K74 (1%) 220K 150K 100nF #
100 Hz 33nF 33K 33nF 33K 220K 150K 68nF #
110 Hz 33nF 30K9 (1%) 33nF 30K9 (1%) 220K 150K 68nF #
120 Hz 33nF 27K 33nF 27K 220K 150K 68nF #
130 Hz 33nF 26K1 (1%) 33nF 26K1 (1%) 220K 150K 68nF #
150 Hz 33nF 22K 33nF 22K 220K 150K 68nF #
160 Hz 33nF 21K3 (1%) 33nF 21K3 (1%) 220K 150K 68nF #
180 Hz 33nF 18K 33nF 18K 220K 150K 68nF #
200 Hz 33nF 16K9 (1%) 33nF 16K9 (1%) 220K 150K 68nF #
220 Hz 33nF 15K 33nF 15K 150K 150K 47nF
240 Hz 33nF 14K3 (1%) 33nF 14K3 (1%) 150K 150K 47nF
270 Hz 33nF 12K 33nF 12K 150K 150K 47nF
300 Hz 33nF 11K3 (1%) 33nF 11K3 (1%) 150K 150K 47nF
330 Hz 33nF 10K 33nF 10K 150K 150K 47nF
360 Hz 33nF 9K53 (1%) 33nF 9K53 (1%) 150K 150K 47nF
390 Hz 33nF 8K2 (1%) 33nF 8K2 (1%) 150K 150K 47nF
17

NOTES:
* THIS TABLE IS ONLY INFORMATIVE. THE ONLY FREQUENCIES THAT PROVIDE THE MANUFAC-
TURE ARE THE INDICATED IN THE TABLE ON PAGE 13.
- The lines in italic defines the frequencies in which are available resistor arrays.
# If you use the frequency card as subwoofer, the ∅∅ capacitor should be of 33nF.
*FREQUENCY CARD GENERALTABLE (CONTINUATION)
FREQUENCY LOWPASSFILTERHIGH PASS FILTERATTAC RELEAS ∅∅
C1,C2,C3
C4,C5,C6 R1 C7,C8 C9,C10 R2,R3
430 Hz 33nF 7K87 (1%) 33nF 7K87 (1%) 150K 150K 47nF
470 Hz 33nF 6K8 33nF 6K8 100K 100K 22nF
510 Hz 33nF 6K65 (1%) 33nF 6K65 (1%) 100K 100K 22nF
560 Hz 33nF 5K6 33nF 5K6 100K 100K 22nF
620 Hz 33nF 5K49 (1%) 33nF 5K49 (1%) 100K 100K 22nF
680 Hz 33nF 4K7 33nF 4K7 100K 100K 22nF
750 Hz 33nF 4K53 (1%) 33nF 4K53 (1%) 100K 100K 22nF
820 Hz 33nF 3K9 33nF 3K9 100K 100K 22nF
910 Hz 33nF 3K74 (1%) 33nF 3K74 (1%) 100K 100K 22nF
1 KHz 3,3nF 33K 3,3nF 33K 82K 47K 10nF
1,1 KHz 3,3nF 30K9 (1%) 3,3nF 30K9 (1%) 82K 47K 10nF
1,2 KHz 3,3nF 27K 3,3nF 27K 82K 47K 10nF
1,3 KHz 3,3nF 26K1 (1%) 3,3nF 26K1 (1%) 82K 47K 10nF
1,5 KHz 3,3nF 22K 3,3nF 22K 82K 47K 10nF
1,6 KHz 3,3nF 21K3 (1%) 3,3nF 21K3 (1%) 82K 47K 10nF
1,8 KHz 3,3nF 18K 3,3nF 18K 82K 47K 10nF
2 KHz 3,3nF 16K9 (1%) 3,3nF 16K9 (1%) 82K 47K 10nF
2,2 KHz 3,3nF 15K 3,3nF 15K 82K 47K 4,7nF
2,4 KHz 3,3nF 14K3 (1%) 3,3nF 14K3 (1%) 82K 47K 4,7nF
2,7 KHz 3,3nF 12K 3,3nF 12K 82K 47K 4,7nF
3 KHz 3,3nF 11K3 (1%) 3,3nF 11K3 (1%) 82K 47K 4,7nF
3,3 KHz 3,3nF 10K 3,3nF 10K 82K 47K 4,7nF
3,6 KHz 3,3nF 9K53 (1%) 3,3nF 9K53 (1%) 82K 47K 4,7nF
3,9 KHz 3,3nF 8K2 3,3nF 8K2 82K 47K 4,7nF
4,3 KHz 3,3nF 7K87 (1%) 3,3nF 7K87 (1%) 82K 47K 4,7nF
4,7 KHz 3,3nF 6K8 3,3nF 6K8 82K 47K 3,3nF
5,1 KHz 3,3nF 6K65 (1%) 3,3nF 6K65 (1%) 82K 47K 3,3nF
5,6 KHz 3,3nF 5K6 3,3nF 5K6 82K 47K 3,3nF
6,2 KHz 3,3nF 5K49 (1%) 3,3nF 5K49 (1%) 82K 47K 3,3nF
6,8 KHz 3,3nF 4K7 3,3nF 4K7 82K 47K 3,3nF
7,5 KHz 3,3nF 4K53 (1%) 3,3nF 4K53 (1%) 82K 47K 3,3nF
8,2 KHz 3,3nF 3K9 3,3nF 3K9 82K 47K 3,3nF
9,1 KHz 3,3nF 3K74 (1%) 3,3nF 3K74 (1%) 82K 47K 3,3nF
10 KHz 330pF 33K 330pF 33K 47K 47K 2,2nF
11 KHz 330pF 30K9 (1%) 330pF 30K9 (1%) 47K 47K 2,2nF
12 KHz 330pF 27K 330pF 27K 47K 47K 2,2nF
18

19
OVERLAPPED FREQUENCY CARD CONFIGURATION:
Sometimes in order to increase the efficiency in low frequencies, or so that the system is
more versatile and could work with or without subwoofer, it is necessary overlap the low and
subwoofer bands. In order to carry out this should configure a frequency card with the low
pass filter to the relevant frequency that wants for the subwoofer, and annul the high pass
filter. The ATTACK and RELEASE resistors will belong to the frequency of the low pass filter,
and the∅capacitor will be of 33nF because of being a subwoofer card.
The next table shows the components value of a subwoofer frequency card overlapped
at 100/ 0 Hz:
OVERLAPPED SUBWOOFER FREQUENCY CARD COMPONENTS (100/0 Hz)..
LOW PASS FILTER (100 Hz) HIGH PASS FILTER (0 Hz)
ATTAC RELEAS ∅∅
C1,C2,C3,C4,C5,C6 R1 C7,C8,C9,C10 R2,R3
33nF 33K PUENTE -- 220K 150K 33nF
PLACING A FREQUENCY CARD
In order to place a frequency card, follow the next steps:
Select the connector where wants to insert the frequency card.
With an angle of about 60º with regard to the main board, takes the frequency card
toward the connector socket, making sure that the polarization card slot is guided toward the
printed number that defines to the main board connector.
Once located the frequency card in the connector socket, push back the frequency card,
until notes that the connector subjection clips have caught to the card.
1
2
3

In order to make sure that the frequency card is perfectly placed, observes that the
connector clips of the main board, holds to the card, and that the lateral polarization ribs of
the connector join with the frequency card holes.
MODES OF OPERATION CONFIGURATION
We saw in the operation section, inside the subsection modes of operation, the possi-
bilities of configuration of the crossovers. This section is going to explain how takes place the
modes of operation configuration of the crossover.
In order to configure the crossover in STEREO or MONO mode, there is a
switch inside the unit. This switch is numerated in the components overlay as
S3, and it placing the crossover frontal toward us, is placed at the high left
corner of the unit (we could find it in the components overlay picture). With this
switch depressed the crossover will be configured in STEREO mode, and
pressed it will be configured in MONO mode.
Once we have decided if we are going to work in STEREO or MONO mode, it is neces-
sary to configure the number of ways that we want. In STEREO mode we could configure the
FA-724 in three or two ways, and the FA-524 in two ways:
THREE STEREO WAYS (ONLY FA-724):
The FA-724 configured in three stereo ways,
has a BYPASS card at position 4 and 5 fre-
quency cards at positions 1,2,3,5 and 6.
Normally the subwoofer will go overlapped
with the low output, because of what we
should overlap the frequency card 1.
The correspondence of them gone out with
the component overlay of the crossover is
showed in the next picture.
TWO STEREO WAYS:
The FA-724, configured in two ways stereo,
has 3 BYPASS cards at positions 3,4 and 6, and
3 frequency cards at the positions 1, 2 and 5.
Normally the subwoofer will go overlapped
with the low output, because of what we
should overlap the frequency card 1.
The correspondence of them gone out with
the component overlay of the crossover is
showed in the next picture. We will also have 2
outputs, HIGH CH1 and HIGH CH2 at FULL
RANGE.
4
FA-724
FA-724
20