ACO23/ACO234 Page 7
TROUBLE SHOOTING
No Sound
If there appears to be no power:
• Check that either the stereo or mono LED on the front panel of the
ACO234-ACO23 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 m
ake 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 chas
sis 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.
• 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 equipmen
t 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.
SPECIFICATIONS
INPUT:
Connectors:
XLR
Type:
Electronically balanced/unbalanced, RF filtered
Impedance:
Balanced > 50 kΩ, unbalanced > 25 kΩ
Max Input Level:
+22 dBu typical, balanced or unbalanced
CMRR:
>40 dB, typically > 55 dB at 1 kHz
OUTPUT:
Connectors:
XLR
Type:
Electronically-
balanced/unbalanced, RF filtered
Impedance:
Balanced 60 Ω, unbalanced 30 Ω
Max Output Level:
>+20 dBu balanced/unbalanced into 600Ω 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:
ACO234: Low Output:
> 94 dB
> 94 dB
Low-Mid Output:
> 94 dB
Mid Output:
> 93 dB
High-Mid Output:
> 92 dB
High Output:
> 90 dB
> 88 dB
