POLARITY SWITHCH
Every output is equipped with a polarity (
φ
) 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 performance. 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 "LF SUM" , while channel two's low output is not used, and channel two's pase
invert led is disabled, indicating it is not operational in "LF SUM" mode. The summed low frequencies 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
You should avoid mounting the unit near large power transformers 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 them cross at 90degree angles.
The input and output connector are balanced.
The VX-02 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 VX-02 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 sufficiently.
·
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 45-960Hz 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.
HUM AND/OR Buzz
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.
