Summary of Contents for Altair FA-524
- Page 1 FA-524/FA-724 ACTIVE CROSSOVERS OWNERS MANUAL ALTAiR EQUIPOS EUROPEOS ELECTRÓNICOS, S.A.L. AVDA. DE LA INDUSTRIA, 50. 28760 TRES CANTOS (MADRID) 91-8043265 91-8044358 altair@altairaudio.com. www.altairaudio.com...
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Page 2: Table Of Contents
CONTENTS 1. SWITCHES, CONTROLS, ADJUSTMENTS AND CONNECTORS FRONT PANEL REAR PANEL 2. WORKING PRECAUTIONS 3. INSTALLATION CHANGING THE VOLTAGE CHANGING THE FUSE CONNECTION TO THE MAINS INPUT CONNECTION OUTPUT CONNECTION GROUND LINK 4. OPERATION MODES OF OPERATION LEVEL CONTROL SIGNAL, THRESHOLD AND OVERLOAD INDICATOR MUTE PHASE SWITCH PHASE ADJUSTMENT BETWEEN WAYS... - Page 3 PLACING AN EQUALIZER CARD DELAY CARD DELAY CARD CONFIGURATION PLACING A DELAY CARD 7. BLOCK DIAGRAM AND OPERATION EXPLAIN 8. REPAIR GUIDE 9. TECHNICAL SPECIFICATIONS 10. GRAPHS 11. WARRANTY...
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Page 4: Switches, Controls, Adjustments And Connectors
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. -
Page 5: Rear Panel
REAR PANEL MAINS CONNECTOR AND FUSE HOLDER. OUTPUT CONNECTOR. VOLTAGE SELECTOR. INPUT CONNECTOR. EARTH LINK SWITCH. -
Page 6: Working Precautions
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. -
Page 7: Connection To The Mains
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. -
Page 8: Output Connection
SOUND SOURCE 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 100 Ω. -
Page 9: Ground Link
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. -
Page 10: Operation
4, 5 or 6 ways for the FA-724 and 3 or 4 ways for the FA-524. -
Page 11: Level Control
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: MODE FA-524 FA-724 COMPONEN OVERLAY HIGH HIGH HIGH HIGH STEREO THREE WAYS HIGH HIGH STEREO TWO F.R. -
Page 12: Mute
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. -
Page 13: Options
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). -
Page 14: Security Cover (Tp-1)
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. -
Page 15: Frequency Cards
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... - Page 16 ATTACK RELEASE 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: ∅.
- Page 17 * FREQUENCY CARD GENERAL TABLE LOW PASS FILTER HIGH PASS FILTER ∅ ∅ FREQUENCY ATTAC RELEAS C1,C2,C3 C7,C8 R2,R3 C4,C5,C6 C9,C10 10 Hz 330nF 330nF 220K 150K 220nF # 11 Hz 330nF 30K9 (1%) 330nF 30K9 (1%) 220K 150K 220nF # 12 Hz 330nF 330nF...
- Page 18 * FREQUENCY CARD GENERAL TABLE (CONTINUATION) LOW PASS FILTER HIGH PASS FILTER ∅ ∅ FREQUENCY ATTAC RELEAS C1,C2,C3 C7,C8 R2,R3 C4,C5,C6 C9,C10 430 Hz 33nF 7K87 (1%) 33nF 7K87 (1%) 150K 150K 47nF 470 Hz 33nF 33nF 100K 100K 22nF 510 Hz 33nF 6K65 (1%)
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Page 19: Overlapped Frequency Card Configuration
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. -
Page 20: Modes Of Operation Configuration
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):... -
Page 21: Six Mono Ways (Only Fa-724)
On the other hand if we configured the crossover in MONO mode, we will have 6, 5, 4 or 3 MONO ways in the FA-724 and of 4 or 3 MONO ways in the FA-524: SIX MONO WAYS (ONLY FA-724): In order to configure the divisor of frequency FA-724 in six mono ways, we should place the 6 frequency cards at positions 1,2,3,4,5 and 6. -
Page 22: Three Mono Ways
LOW CH2, the MID CH2 and the HIGH CH2 outputs at FULL RANGE. FA-524 The FA-524, configured in three mono ways, has 1 BYPASS card placed at position 5, and 3 frequency cards at positions 2, 3 and 4. Normally the... -
Page 23: Equalizer Card
As seen in the previous picture, the switch 1 activates (at right) or disables (at left) the limiter (with the limiter inactive, the configuration of the other switches is indifferent). With the switch 6 you can configure positive dBv (at right) or negative (at left). The other switches 2,3,4 and 5 configure the number of dBv, in a binary addition manner, so that the number of configured dBv is the sum of these switches that are located at left, those that are located at right will always be in 0 dBv. -
Page 24: Equalizer Card Configuration
EQUALIZER CARD CONFIGURATION: The next picture shows the component overlay of an equalizer card. As seen in the picture, there are 6 resistors called RG+, RG-, RQ, RQ,' RF and RF' . This resistors define the gain (RG+ or RG-), the bandwidth (RQ and RQ') and the center frequency (RF and RF') of the equalization point: Before adjusting a equalizer card, you should decide the gain, bandwidth and center frequency that you want to implement, for this could use a parametric equalizer or a graphic... -
Page 25: Filter Frequency Calculation
It is always advisable that use 1% resistors, since if use 5% resistors, the gain has more variation with regard to the table. You should be careful with the high gains adjustment (higher than 6 dB), since the crossover dynamic decreases considerably. FILTER FREQUENCY CALCULATION: There are two resistors in the equalizer card called RF and RF,' that configure the center frequency of the equalization point. -
Page 26: Bandwidth Calculation (Q)
If you don't find the resistances for low frequencies, since they are very big, you could change the capacitors C2 and C3 to 33 nF, and divide the resistor value of the table by 10. This could only be made between frequencies in the range of 25 Hz and 2 KHz, since the RF and RF' resistors could never be less than 2 KΩ. -
Page 27: Band Gain Variation
5% RESISTORS 33 K 36 K 39 K 1% RESISTORS 30,9 K 32,4 K 33,2 K 34,0 K 34,8 K 35,7 K 37,4 K 38,3 K 39,2 K 40,2 K 43 K 47 K 5% RESISTORS 1% RESISTORS 41,2 K 42,2 K 43,2 K 44,2 K 45,3 K... -
Page 28: Non Standard Examples Configuration
GAIN +6 dBv +4 dBv +2 dBv -2 dBv -4 dBv -6 dBv 4K99 6K34 7K87 12K4 15K8 NON STANDARD EXAMPLES CONFIGURATION: With the parametric equalization point, you also could simulate shelving and notch filters. In order to carry out a shelving filter, you should select the frequency 35 Hz for low frequencies or 16 KHz for high frequencies and a very small Q of 0.4 for example. -
Page 29: Placing An Equalizer Card
PLACING AN EQUALIZER CARD: Before placing the equalizer card you should adjust it, for this it is recommended that read the previous sections carefully, if you haven't done yet. In order to place an equalizer card in the main board, follow the next steps: Turn off the crossover and disconnect it of the mains. -
Page 30: Delay Card
DELAY CARD It is available a delay card as option, with two basic configurations: 2 ms (70 cm) valid up to 2 KHz and of 500 µs (17 cm), valid up to 8 KHz. Each crossover way could have a delay point. The next table show the main board connectors where you could insert these delay cards, depending on the way in which you want to introduce the delay: DELAY CARD INSERT CONNECTORS... -
Page 31: Placing A Delay Card
DELAY CARD EFFECT, DEPENDING ON DS1 SWITCH 0-250µs 250-500µs 500-750µs 750-1000µs 1000-1250µs 1250-1500µs 1500-1750µs 1750-2000µs 500µs 0-62,5µs 62,5-125µs 125-187,5µs 187,5-250µs 250-312,5µs 312,5-375µs 375-437,5µs 437,5-500µs The theoretical adjustment of a delay card is carried out measuring the distance be- tween reels in a speaker system. Keeping the way that is more advanced in the sound pla of the speaker system as reference, will measure the distance of their reel with the other ones. -
Page 32: Block Diagram And Operation Explain
Turn off the crossover and disconnect it of the mains. Remove the connector jumper where you want to insert the delay card (the connectors where you could insert the delay card are indicated in a table on page 31). Insert the delay card in the connector, guiding the printed circuit board toward the com- ponent overlay indication of the card orientation in the main board. -
Page 35: Repair Guide
In the input, the signal crosses the two RFI filters and its electronically unbalanced. Later, the signal go through two filters, the ultrasonic filter placed at 30 KHz and the subsonic one placed at 30 Hz. In the INPUT CH2 the signal crosses the STEREO/MONO switch and it takes the signal of this input when the switch is at position STEREO or of the INPUT CH1 when the switch is at position MONO. - Page 36 us the key in order to begin to look for the problem, saving us time and unnecessary efforts. Keep in mind when remove an element of the main board, that it is double layer printed circuit, because of what the components PADs goes joined of one layer to another one through a metal tube (VIA), because of what could not do much strength for if pulled up the VIA.
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Page 37: Technical Specifications
9. TECHNICAL SPECIFICATIONS TECHNICAL SPECIFICATIONS 10 KOhms Electronically balanced. Input impedance. 0 dBv. nominal / +21 dBv. maximum. Input level. ±6 dB. Level control by calibrated rotatory potentiometer. Gain/Attenuation. 100 Ohms Electronically balanced. Output impedance. 0 dBv nominal / +21 dBv maximum. Output level. -
Page 38: Graphs
10. GRAPHS Typical crosstalk. Typical noise at one output. Typical attenuation of the MUTE switch. Typical common mode relation ratio (CMRR). -
Page 39: Warranty
Equipos Europeos Electrónicos reserves the right to modify the prices or the technical specifications without notice. SERIAL NUMBER ........... ALTAiR EQUIPOS EUROPEOS ELECTRÓNICOS, S.A.L. Avda. de la Industria, 50. 28760 TRES CANTOS-MADRID (ESPAÑA). 34-91-804 32 65 34-91-804 43 58 altair@altairaudio.com. - Page 40 Información basada en la Directiva de la unión europea RAEE 2002/96/EC y el Real Decreto 208/2005 AUDIO ELECTRONICS DESIGN AUDIO ELECTRONICS DESIGN AUDIO ELECTRONICS DESIGN AUDIO ELECTRONICS DESIGN EQUIPOS EUROPEOS ELECTRÓNICOS, S.A.L Avda. de la Industria, 50. 28760 TRES CANTOS-MADRID (SPAIN). 34-91-761 65 80 34-91-804 43 58 altair@altairaudio.com www.altairaudio.com...