Redback A 5350 User manual
A 5350 2 Way Stereo / 3 Way Mono Active Crossover
®
www.altronics.com.au
Operating Instructions
STEREO 2-WAY MODE
In 2-way stereo mode the controls are marked BELOW the horizontal red line.
Channel one and channel two functions are identical in the stereo mode.
LEDs are disabled for controls which are non-functional in this mode.
See panel diagrams.
4& 21 INPUT GAIN Controls the INPUT level with +/- 12 dB of gain.
6& 23 LOW CUT Switch for selecting the 40 Hz high pass filter.
5 & 22 LED indicating low cut mode operation.
7& 24 LOW/HIGH Selects crossover point between LOW and HIGH outputs.
8, 9, 25, 26 X10 LED Indicates and changes the LOW/HIGH crossover fre-
quency range is 450 Hz to 9.6 kHz.
10 & 27 LOW OUTPUT Controls low frequency output with a range 0 to 10.
12 & 29 PHASE INVERT Switch for reversing polarity on the low output.
11 & 28 LED indicates that the phase is reversed.
13 & 30 HIGH OUTPUT Controls high frequency output with a range 0 to 10.
15 & 32 PHASE INVERT Switch for reversing the polarity on the High Output.
14 & 31 LED indicates that the phase is reversed.
20 STEREO LED indicating stereo mode operation.
MONO 3 -WAY MODE
In 3-way mono operation the controls are marked ABOVE the horizontal blue
line. Front panel controls not described in this section are not active in mono
3-way mode. LEDs are disabled for controls which are nonfunctional in this
mode. See panel diagrams.
1Power Switch Press this switch to turn the power ON. Press it again to turn
the power OFF.
2Sub woofer frequency controls Selects crossover point in low frequency.
3Sub woofer output level controls Controls the sub woofer output level.
4INPUT GAIN Controls the input level with +/- 12 dB of gain.
6LOW CUT Switch for selecting the 40 Hz high pass filter.
5LED indicates that the phase is reversed.
7LOW/MID Selects crossover point between LOW and MID frequencies.
8& 9X10 LED Indicates And Change the LOW/MID crossover range is 450
Hz to 9.6 kHz.
24 MID/HIGH Selects crossover point between MID and HIGH frequencies.
25 & 26 X10 LED Indicates And Change the MID/HIGH crossover frequency
range is 450 Hz to 9.6 kHz
10 LOW OUTPUT Controls LOW frequency output level with a range 0 to 10.
12 PHASE INVERT Switch for reversing the polarity on the Low Output.
11 LED indicates that the phase is reversed.
27 MID OUTPUT Controls MID frequency output with a range of 0 to 10.
29 PHASE INVERT Switch for reversing the polarity on the mid output.
28 LED indicates that the phase is reversed.
30 HIGH OUTPUT Controls HIGH frequency output with a range of 0 to 10.
32 PHASE INVERT Switch for reversing the polarity on the high output.
31 LED indicates that the phase is reversed.
35 & 38 Input jack. For connecting to pre amplifiers or mixer output.
33 & 36 High frequency output jack. For connecting to power amplifiers.
34 Low frequency output jack. For connecting to power amplifiers.
40 Voltage selector switch The switch for selection 110v or 220v.
41 AC input. The AC socket is for connecting to power source.
18 MONO LED indicating mono mode operation.
19 The mode switches on the front panel of the unit are used to select one
of two modes of operation in the A 5350. There could be disastrous conse-
quences if the crossover were improperly setup or the switches were mistak-
enly pushed during the regular operation of a sound system. Therefore great
care should be taken when setting these switches. There is a mode diagram
on the back panel to help you understand at a glance how this is done.
The following steps should be taken in setting up your system:
• Know the loudspeaker manufacturer’s requirements regarding the amplifi-
cation needs of your particular speaker system. Follow the manufacturer’s
guidelines carefully, as Altronics is not responsible for damage relating to
improper setup or implementation of the A 5350.
• Without any audio or power connections in place, use the switches on the
crossover to set it to the proper mode of operation; either stereo 2-way or
mono 3-way for the A 5350.
• Use the literature that came with your speaker system to properly set up
the mode of operation and crossover frequencies to the manufacturer‘s
specifications.
For stereo 2-way operation use the markings above the connectors. To oper-
ate the A 5350 in mono 3-way mode use the markings below the connectors.
The connectors which are not used in the selected mode are marked “not
used”. This designation applies only to that mode of operation.
AUDIO CONNECTIONS
• Before connecting anything to the crossover, make sure it is not connected
to any power source.
• Be sure that the source device (equalizer, compressor, mixing console,
etc.) for the A 5350 is turned off. Connect the output(s) of the source
device to the inputs of the crossover, following the rear panel markings
carefully.
• Make sure that the amplifiers which will be used to drive your speaker
system are turned off. Using the back panel markings as a guide, use
high quality cables to connect the amplifiers to the appropriate outputs
of the A 5350.
ELECTRICAL CONNECTIONS
Ensure that you’re A 5350 crossover conforms to the AC power specifica-
tions in your area, by checking the marked voltage spec on the rear of the
unit. Never plug the incorrect voltage into your crossover, as this may cause
severe damage not covered under the Unika warranty. Connect the power
cord to the crossover first, then to a power source that is properly grounded.
Never lift the ground as a shock hazard may result. After you have safely
plugged in the crossover, turn on the source device(s). Turn the amplifiers’
outputs all the way down (0) and turn on the amplifiers. All of the elements
of your sound system should now be on, and the amplifiers should be
turned all the way down. Turn the source device to its nominal operating
level, sending a nominal (average) level to the A 5350. Slowly turn up the
amplifiers’ outputs until you can hear signal at a comfortable volume. Make
adjustments as you desire.
FEATURES X10 OPERATION
If you are using your system in stereo 2-way or 3-way mode, the needed
crossover frequency may be higher than 960 Hz, making it necessary to set
the x10 switch to the active position. This changes the range of operation of
the frequency selector from 45-960 Hz to 450 Hz to 9.6 kHz. All other fre-
quency selectors remain the same. When using the X10 switch, ALWAYS
ensure that the amplifiers feeding all speaker systems are turned off or that
the input gain controls on the power amplifiers are turned down before
changing the setting of the X10 switch. Not doing so may send a spurious
signal to the outputs of the crossover when the X10 switch is engaged, and
may damage speaker systems which are powered at the time of the spuri-
ous signal.
POLARITY SWITCH
Every output is equipped with a polarity (Ø) reverse switch on the front
panel. When speakers are not “in phase”, the frequency response of the
system is compromised, particularly in the low frequencies. Out of phase
signals can also cause “comb-filtering” in the high frequencies. The polarity
switch is extremely useful for fine tuning your sound system for peak per-
formance. An LED is activated when the output polarity is reversed.
LOW FREQUENCY SUMMING
The other feature accessed on the back panel is “low frequency summing “.
This is useful with systems that utilize mono subwoofers. Activating the LF
sum switch “sums” the low frequencies of both the left and right inputs. The
sum is sent to channel one’s low output marked “LFSUM”, while channel
two’s low output is not used, and channel two’s phase invert led is disabled,
indicating it is not operational in “LF Sum” mode. The summed low fre-
quencies represent all the low frequencies of both the left and right inputs,
and since lows are generally non-directional anyway, it will not detract from
the true stereo picture of the source material.
RACK MOUNTING, GROUNDING AND SAFETY
We have provided 4 rack screws and washers for easy mounting in standard
audio racks. You should avoid mounting the unit near large power trans-
formers or motors. Route the AC cord away from audio lines and plug it into
a power source close by. If the power cord must cross over audio lines, you
should take care to have them cross at 90 degree angles.
The input and output connectors are balanced/unbalanced XLR- type con-
nectors. XLR pin 2 is hot (+), pin 3 is cold (-), and pin 1 is the ground or
shield.
The A 5350 crossovers have differentially balanced input and output circuits.
Balanced wiring is recommended, even with unbalanced source devices,
especially when running long paths. Twin-conductor, shielded cable is more
reliable since it does not depend on the shield wire itself to complete the
signal connection. Using twin conductor cable, a broken shield may only
result in a slight increase in noise or hum due to the lack of shielding. You
may also use unbalanced cables to connect to and from the crossover.
TROUBLESHOOTING
NO SOUND
If there appears to be no power:
• Check that either the stereo or mono LED on the front panel of the
A 5350 is lit.
• Check that the power cord is seated properly in the back panel of the
crossover and that it is plugged into an active AC power source.
If there appears to be power, but no audible signal:
• Confirm that active audio lines are connected to the crossover’s inputs
and outputs.
• Check that both the input and output gain controls are advanced suffi-
ciently.
• Check to make sure that you have turned up the amplifiers’ outputs.
ABNORMAL AUDIO OUTPUT
• Ensure that the proper mode for your setup has been selected via the
rear panel mode switches.
• Check the LF Sum switch.
• Check the x10 switch. This changes the range of the crossover frequency
from 45 - 960 Hz to 450 Hz - 9.6 kHz.
WEAK AND/OR DISTORTED AUDIO
• Check that a clean signal is being fed to the crossover.
• Confirm that the input wiring is correct.
• Check that the grounds of the audio signal path and the chassis and
power line of all units in the system are connected.
If you suspect that the hum is caused by a ground loop:
• Systematically remove and/or connect the audio grounds of the devices
in the signal path.
• Remember, for safety you must maintain connection to chassis ground.
Never lift a safety ground.
If you suspect the hum is not caused by a ground loop.
• Check the audio at an earlier stage in the audio chain.
• Low level equipment should be mounted away from power amplifiers to
avoid induction of this type of hum.
• Be certain that all audio wiring except for loudspeaker lines is well
shielded, and that low level wiring is not run parallel to and/or in close
proximity to AC power wiring.
INTERMITTENT AUDIO
• Check the other equipment and the wiring to make certain that the signal
is not intermittent earlier in the chain.
• Check the integrity of all cables using a cable tester.
A 5350 Instructions
POWER
CHANNEL
ONE
GAIN
INP U T
0
-12 +12
40Hz
LOW CUT LOW/MID MONO
STEREOLOW SUM
INP U T
XOVER FREQ
LOW/HIGHLOW CUT
GAIN
LOW OUT
SUB FREQ
20Hz 200Hz
WOOFER GAIN
010
LOW OUT
GAIN
HIGH O UT
MODE
GAIN
0
-12 +12
INP UT
40Hz
MID/HIGH
XOVER FREQ
LOW/HIGHLOW CUT
GAIN
MIDOUT
LOW OUT
GAIN
HIGH O UT
HIGH O UT
CHANNEL
TWO
St er eo 2 W a y / M on o
3-Wa y Cr ossov er
45Hz
70
140
240Hz
350
680
960Hz
65
42.5
87.5
11 0 H z
132.5
155
177.5
45Hz
70
140
240Hz
350
680
960Hz
010 010
0
10
010
INV
INV
INV INV
X1
X10
X1
X10
NORMAL
SU MME D
FRONT
1
2
3
4
6
7
9
10 12 13 15 17 19 21 23 24 26 27 29 30 32
5811
14 16 18 20 22 25 28 31
HIGH/OUTLOW/OUT
CH TW O
IN
HIGH/OUT LOW/OUT
CH ONE
IN SUB WOOFER OUTSTEREO
MONO HIGH/OUT
FUSE:
0.5A/110V~120V
0.25A/220V~240V
ACINPUT
15 WA TT S
MID/OUT NOT USED NOT USED LOW/OUT INPUT
WARNING:
TO PREVENT FIRE OR SHOCK
HAZARD. DO NOT EX POSE THIS
APPL IANCE TO RAIN OR
MOISTURE.
CAUTION
-TO PREVENT ELECTRIC SHOCK, DONOT REMOVE COVER
OR ANY SCREWS. NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING
TO Q UALIFIED SERVICE P ERSONNEL.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPE N
!
SERIAL NO.:
VOLTAGE:
11 0V ~ 2 20V 50 / 60 Hz
120V~240V 50/60Hz
33 34 35 36 37 38 39 40 41
WARNING FOR YOUR PROTECTION, PLEASE READ THE FOLLOWING:
WATER AND MOISTURE: Appliance should not be used near water (e.g. near a bathtub, washbowl, kitchen sink, laundry tub, in a wet base-
ment, or near a swimming pool, etc). Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through
openings.
POWER SOURCES: The appliance should be connected to a power supply only of the type described in the operating instructions or as
marked on the appliance.
GROUNDING OR POLARIZATION: Precautions should be taken so that the grounding or polarization means of an appliance is not defeated.
POWER CORD PROTECTION: Power supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon
or against them, paying particular attention to cords at plugs, convenience receptacles, and the point where they exit from the appliance.
SERVICING: To reduce the risk of fire or electric shock, the user should not attempt to service the appliance beyond that described in the
operating instructions. All other servicing should be referred to qualified service personnel.
FOR UNITS EQUIPPED WITH EXTERNALLY ACCESSIBLE FUSE RECEPTACLE: Replace fuse with same type and rating only.
ELECTROMAGNETIC COMPATIBILITY
This unit conforms to the Product Specifications noted on the Declaration of Conformity. Operation is subject to the following two conditions:
• this device may not cause harmful interference, and
• this device must accept any interference received, including interference that may cause undesired operation.
Operation of this unit within significant electromagnetic fields should be avoided.
Use only shielded interconnecting cables.
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE
RISK OF ELECTRIC SHOCK - DO NOT OPEN
There are no user serviceable parts inside the unit. Do not open the unit. Do not attempt to service the unit yourself. Refer all servicing to
qualified personnel. Opening the chassis for any reason will void the manufacturer’s warranty. Do not get the unit wet. If liquid is spilled on
the unit, shut it off immediately and take it to a dealer for service. Disconnect the unit during storms to prevent damage.
Distributed by Altronic Distributors Pty. Ltd. Perth. Western Australia.
Phone: 1300 780 999 Fax: 1300 790 999
Internet: www.altronics.com.au
A 5350 SPECIFICATIONS
INPUT:
Connectors: XLR
Type: Electronically balanced/unbalanced, RF filtered
Impedance: Balanced > 50 kohm, unbalanced > 25 kohm
Max Input Level: +22 dBu typical, balanced or unbalanced
CMRR: >40 dB, typically > 55 dB at 1 kHz
OUTPUT:
Connectors: XLR
Type: Impedance-balanced/unbalanced, RF filtered
Impedance: Balanced 200 ohm, unbalanced 100 ohm
Max Output Level: >+21 dBu balanced/unbalanced into 2 kohm or greater
PERFORMANCE:
Bandwidth: 20 Hz to 20 kHz, +0/-0.5 dB
Frequency Response: < 3 Hz to > 90 kHz, +0/-3 dB
Signal-to-Noise: Ref: +4 dBu, 22 kHz measurement bandwidth
Stereo Mode: Mono Mode:
Low Output: > 94 dB > 94 dB
Mid Output: > 93 dB
High Output: > 91 dB > 91 dB
Dynamic Range: > 106 dB, unweighted, any output
THD+Noise: < 0.004% at +4 dBu, 1 kHz
< 0.04% at +20 dBu, 1 kHz
Interchannel Crosstalk: < -80 dB, 20 Hz to 20 kHz
CROSSOVER FREQUENCIES:
Stereo Mode:
Low/High: 45 to 960 Hz or 450 Hz to 9.6 kHz (x10 setting)
Mono Mode:
Low/Mid: 45 to 960 Hz or 450 Hz to 9.6 kHz (x10 setting)
Mid/High: 45 to 960 Hz or 450 Hz to 9.6 kHz (x10 setting)
Filter Type: Linkwitz-Riley, 24 dB/octave, state-variable
FUNCTION SWITCHES:
Low Cut: Activates 40 Hz Butterworth, 12 dB/octave high-pass
filter, one switch per channel.
Phase Invert: Inverts the phase at the output, one switch per output.
x10: Multiplies crossover frequency range by 10, one switch per channel.
Mode: Selects stereo/mono and 2/3/4-way operation.
LF Sum: Selects normal (stereo) or mono-summed low frequency operation.
INDICATORS:
Stereo Operation: Green LED
Mono Operation: Yellow LED
Low Cut: Red LED per channel
x10: Green LED per channel
Phase Invert: Red LED per output (3 per channel)
POWER SUPPLY:
Operating Voltage: 240 VAC 50/60 Hz
Power Consumption: 15 Watts
PHYSICAL:
Dimensions: 44 x 483 x 175mm
Weight: 2kg
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