OmniSistem Beta 3 – C223 - Manual (Page 6)

2-WAY, 3-WAY CROSSOVERS
C223
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 phase 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
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
The input and output connectors are balanced/unbalanced XLR TRS-type
connectors. The tip of the plug is wired as hot(+), the ring is wired as cold(-)
The C223 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.
stereo picture of the source material.
take care to have them cross at 90 degree angles.
and the sleeve is wired as the ground or shield.
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 45-1kHz to 450Hz-9.6kHz.
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.
LOW FREQUENCY
SUMMING
If there appears to be no power:
Check that either the stereo or mono LED on the front panel of the C223
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.
RACK MOUNTING,
GROUNDING AND SAFETY
TROUBLESHOOTING
NO SOUND
ABNORMAL AUDIO
OUTPUT
1GROUND 2+ 3-
5