Advertisement
• 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.
A 5350 Instructions
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.
Advertisement
