2-Way, 3-Way
223/223XL-234/234XL
4-Way Crossovers
Operation
Manual
®
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2-Way, 3-Way
4-Way Crossovers
1
223/223XL-234/234XL
TABLE OF CONTENTS
WARRANTY....................................................................................................................2
INTRODUCTION .......................................................................................................................................................2
INSPECTION ...........................................................................................................................................................3
234/234XL FRONT PANEL OPERATION .............................................................................................................................3
223/223XL FRONT PANEL OPERATION .............................................................................................................................5
234/234XL-223/223XL REAR PANEL OPERATIONS ...........................................................................................................6
234/234XL-223/223XL AUDIO CONNECTIONS ...................................................................................................................7
ELECTRICAL CONNECTIONS .............................................................................................................................................7
FEATURES ...........................................................................................................................................................................7
RACK MOUNTING, GROUNDING AND SAFETY ...............................................................................................................8
TROUBLESHOOTING ..........................................................................................................................................................9
234/234XL-223/223XL SPECIFICATIONS ..........................................................................................................................11
DECLARATION OF CONFORMITY ....................................................................................................................................12
®
8760 South Sandy Pkwy.
Sandy, Utah 84070
Phone: (801) 568-7660
Fax: (801) 568-7662
Int’l Fax: (219) 462-4596
A Harman International Company
Questions or comments?
E•mail us at: [email protected]
or visit our World Wide Web home page at:
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2-Way, 3-Way
223/223XL-234/234XL 4-Way Crossovers
2
1. The warranty registration card that accompanies this product must be
WARRANTY
mailed within 30 days after purchase date to validate this warranty.
Proof-of-purchase is considered to be the burden of the consumer.
2. dbx warrants this product, when bought and used solely within the
U.S., to be free from defects in materials and workmanship under nor-
mal use and service.
3. dbx liability under this warranty is limited to repairing or, at our discre-
tion, replacing defective materials that show evidence of defect, provid-
ed the product is returned to dbx WITH RETURN AUTHORIZATION
from the factory, where all parts and labor will be covered up to a peri-
od of two years. A Return Authorization number must be obtained from
dbx by telephone. The company shall not be liable for any consequen-
tial damage as a result of the product's use in any circuit or assembly.
4. dbx reserves the right to make changes in design or make additions to
or improvements upon this product without incurring any obligation to
install the same additions or improvements on products previously
manufactured.
5. The foregoing is in lieu of all other warranties, expressed or implied,
and dbx neither assumes nor authorizes any person to assume on its
behalf any obligation or liability in connection with the sale of this prod-
uct. In no event shall dbx or its dealers be liable for special or conse-
quential damages or from any delay in the performance of this warran-
ty due to causes beyond their control.
INTRODUCTION
Congratulations on your purchase of the dbx 223/223XL or 234/234XL
crossover. We are confident you will find this crossover to be the finest
product of its kind in this price range. We have taken care to include all of
the features you need to make your system sound its best. Some of the
features common to both the 234/234XL and the 223/223XL crossovers
are:
• back panel switches for selecting the operating mode of the
crossover.
• back panel switches indicating the selected range of crossover fre-
quencies. Both of these features have LED indicators on the front
panel so you can see at a glance which mode the unit is in.
• low frequency summed output designed specifically for mono sub-
woofer applications.
• phase invert switches on all outputs.
• individual level controls on every output.
We are sure you will agree that these crossovers are built to provide
extremely high quality frequency division for all applications.
®
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2-Way, 3-Way
223/223XL-234/234XL
4-Way Crossovers
3
INSPECTION
Before going any further, you should take time to fill out your warranty
registration card and inspect the contents of the shipping carton. Inside
both the 223/223XL and 234/234XL boxes you should find the following:
• either the dbx model 223, 223XL, 234, or the 234XL crossover.
• operation manual (you are reading it!)
• 4 rack screws and washers
• power cord.
The contents of this manual are subject to change at any time without
notice.
dbx 234/234XL Front Panel
Note: There are no front panel differences between the 234 and the 234XL. Therefore the
234XL is shown below, representing both the 234 and the 234XL.
1
2
3
2.4k
Hz
4
5
6
7
8
9
10
11
12
CHANNEL ONE
CHANNEL TWO
240
-10
-10
-10
-10
-10
-10
0
240
0
2.4k
140
350
680 700
x10
1.4k
3.5k
140
350
1.4k
3.5k
-6
+6
-6
+6
-30
6.8k
-30
6.8k
70
0
-30
0
-30
0
70
680 700
0
-30
0
-30
0
40 Hz
INV
INV
INV
40 Hz
INV
INV
INV
x10
-12
+12
45
960
450
9.6k
+6
+6
+6
-12
+12
45
960
450
9.6k
+6
+6
+6
-
-
-
-
-
-
dB
GAIN
Hz
dB
GAIN
dB
GAIN
dB
GAIN
dB
GAIN
Hz
Hz
dB
GAIN
dB
GAIN
dB
GAIN
XOVER FREQ
XOVER FREQ
XOVER FREQ
XOVER FREQ
INPUT
LOW CUT
LOW/LOW-MID
LOW/MID
LOW-MID/HIGH-MID
MID/HIGH
LOW OUTPUT
LOW OUTPUT
LOW-MID OUTPUT
MID OUTPUT
HIGH-MID/HIGH
MID/HIGH
HIGH-MID OUTPUT
MID OUTPUT
HIGH OUTPUT
MONO
STEREO
INPUT
LOW CUT
HIGH OUTPUT
INPUT
LOW CUT
LOW/MID
LOW OUTPUT
HIGH OUTPUT
13
14
15
16
17 18 19
20
21
22
23
24
STEREO 2-WAY MODE
In 2-way stereo mode the controls are marked BELOW the horizontal blue line.
Channel One and Channel Two functions are identical in the stereo mode. Front panel controls not described in
this section are not active in stereo 2-way operation.
[1] & [7]
[13] & [20]
INPUT GAIN
LOW CUT
Controls the INPUT level with +/- 12 dB of gain.
Switch for selecting the 40 Hz high pass filter. An LED indicates the
selection.
[2] & [8]
[14] & [21]
LOW/MID*
X10 LED
Selects crossover point between the LOW and HIGH outputs.
Indicates that the LOW/HIGH crossover frequency range is 450 Hz to
9.6 kHz.
[4] & [10]
[15] & [22]
LOW OUTPUT
PHASE INVERT
Controls the Low frequency output level with a range of -∞ to +6 dB.
Switch for reversing the polarity on the Low Output. An LED indicates
that the phase is inverted.
[6] & [12]
[17] & [24]
HIGH OUTPUT
PHASE INVERT
Controls the High frequency output with a range of -∞ to +6 dB.
Switch for reversing the polarity on the High Output. An LED indicates
that the phase is inverted.
[19]
STEREO
LED indicating stereo mode operation.
* although this control is labeled as “LOW/MID”, it operates as the crossover frequency control between low and
high frequencies in stereo 2-way operation.
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2-Way, 3-Way
223/223XL-234/234XL 4-Way Crossovers
4
1
2
3
4
5
6
7
8
9
10
11
12
CHANNEL ONE
CHANNEL TWO
240
-10
-10
-10
-10
-10
-10
0
240
2.4k
0
2.4k
140
350
680 700
x10
1.4k
3.5k
140
350
1.4k
3.5k
-6
+6
-6
+6
-30
6.8k
-30
6.8k
70
0
-30
0
-30
0
70
680 700
0
-30
0
-30
0
40 Hz
INV
INV
INV
40 Hz
INV
INV
INV
x10
-12
+12
45
960
450
9.6k
+6
+6
+6
-12
+12
45
960
450
9.6k
+6
+6
+6
-
-
-
-
-
-
dB
GAIN
Hz
Hz
dB
GAIN
dB
GAIN
dB
GAIN
dB
GAIN
Hz
Hz
dB
GAIN
dB
GAIN
dB
GAIN
XOVER FREQ
XOVER FREQ
XOVER FREQ
XOVER FREQ
INPUT
LOW CUT
LOW/LOW-MID
LOW/MID
LOW-MID/HIGH-MID
MID/HIGH
LOW OUTPUT
LOW OUTPUT
LOW-MID OUTPUT
MID OUTPUT
HIGH-MID/HIGH
MID/HIGH
HIGH-MID OUTPUT
MID OUTPUT
HIGH OUTPUT
HIGH OUTPUT
MONO
STEREO
INPUT
LOW CUT
HIGH OUTPUT
INPUT
LOW CUT
LOW/MID
LOW OUTPUT
13
14
15
16
17 18 19
20
21
22
23
24
STEREO 3-WAY MODE
In 3-way stereo operation the controls are marked BELOW the horizontal blue 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.
[1] & [7]
[13] & [20]
INPUT GAIN
LOW CUT
Controls the INPUT level with +/- 12 dB of gain.
Switch for selecting the 40 Hz high pass filter. An LED indicates the selec-
tion.
[2] & [8]
[14] & [21]
[3] & [9]
[4] & [10]
[15] & [22]
LOW/MID
X10 LED
MID/HIGH
LOW OUTPUT
PHASE INVERT
Selects crossover point between LOW and MID frequencies.
Indicates that the LOW/MID crossover frequency range is 450 Hz to 9.6 kHz.
Selects crossover point between MID and HIGH frequencies.
Controls the Low Frequency output level with a range of -∞ to +6 dB.
Switch for reversing the polarity on the Low Output. An LED indicates the
selection.
[5] & [11]
[16] & [23]
MID OUTPUT
PHASE INVERT
Controls the Mid Frequency output with a range of -∞ to +6 dB.
Switch for reversing the polarity on the Mid Output. An LED indicates the
selection.
[6] & [12]
[17] & [24]
HIGH OUTPUT
PHASE INVERT
Controls the High Frequency output with a range of -∞ to +6 dB.
Switch for reversing the polarity on the High output. An LED indicates the
selection.
[19]
STEREO
LED indicating stereo mode operation.
MONO 4 -WAY MODE
In 4-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 4-way mode. LEDs are disabled for controls which are non-functional in mono 4-way
mode.
[1]
[13]
INPUT GAIN
LOW CUT
Controls the input level with +/- 12 dB of gain.
Switch for selecting the 40 Hz high pass filter. An LED indicates the
selection.
[2]
[14]
LOW/LOW-MID
X10 LED
Selects crossover point between LOW and LOW-MID frequencies.
Indicates that the LOW/LOW-MID crossover frequency range is 450 Hz to
9.6 kHz.
[3]
[9]
[4]
[15]
LOW-MID/HIGH-MID
HIGH-MID/HIGH
LOW OUTPUT
Selects the crossover point between LOW-MID and HIGH-MID frequencies.
Selects the crossover point between HIGH-MID and HIGH frequencies.
Controls the LOW frequency output level with a range of -∞ to +6 dB.
Switch for reversing the polarity on the Low Output. An LED indicates the
selection.
PHASE INVERT
[5]
[16]
LOW-MID OUTPUT
PHASE INVERT
Controls the LOW-MID frequency output level with a range of -∞ to +6 dB.
Switch for reversing the polarity on the Low-Mid Output. An LED indicates
the selection.
[11]
[23]
HIGH-MID OUTPUT
PHASE INVERT
Controls the HIGH-MID frequency output level with a range of -∞ to +6 dB.
Switch for reversing the polarity on the High-Mid Output. An LED indicates
the selection.
[12]
[24]
HIGH OUTPUT
PHASE INVERT
Controls the HIGH frequency output level with a range of -∞ to +6 dB.
Switch for reversing the polarity on the High Output. An LED indicates
the selection.
[18]
MONO
LED indicating mono mode operation.
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2-Way, 3-Way
223/223XL-234/234XL
4-Way Crossovers
5
dbx 223/223XL Front Panel
Note: There are no front panel differences between the 223 and the 223XL. Therefore the
223XL is shown below, representing both the 223 and the 223XL.
1
2
3
4
5
6
7
8
CHANNEL ONE
CHANNEL TWO
0
240
-10
-10
0
240
-10
-10
140
350
140
350
-6
+6
-6
+6
-30
680
-30
680
70
0
-30
0
70
0
-30
0
40 Hz
INV
INV
40 Hz
INV
INV
x10
x10
-12
+12
45
960
+6
+6
-12
+12
45
960
+6
+6
-
-
-
-
dB
GAIN
Hz
dB
GAIN
dB
GAIN
dB
GAIN
Hz
dB
GAIN
dB
GAIN
XOVER FREQ
XOVER FREQ
INPUT
LOW CUT
LOW/MID
LOW OUTPUT
LOW OUTPUT
MID/HIGH
MID OUTPUT
LOW OUTPUT
HIGH OUTPUT
HIGH OUTPUT
MONO
STEREO
INPUT
LOW CUT
LOW/HIGH
HIGH OUTPUT
INPUT
LOW CUT
LOW/HIGH
9
10
11
12 13 14
15
16
17
18
STEREO 2-WAY MODE
In 2-way stereo mode the controls are marked BELOW the horizontal blue 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.
[1] & [5]
[9] & [15]
INPUT GAIN
LOW CUT
Controls the INPUT level with +/- 12 dB of gain.
Switch for selecting the 40 Hz high pass filter. An LED indicates
the selection.
[2] & [6]
[10] & [16]
LOW/HIGH
X10 LED
Selects crossover point between the LOW and HIGH outputs.
Indicates that the LOW/HIGH crossover frequency range is 450
Hz to 9.6 kHz.
[3] & [7]
LOW OUTPUT
PHASE INVERT
Controls the Low Frequency output level with a range of -∞ to +6
dB.
Switch for reversing the polarity on the Low Output. An LED indi-
cates the selection.
[11] & [17]
[4] & [8]
[12] & [18]
HIGH OUTPUT
PHASE INVERT
Controls the High Frequency output with a range of -∞ to +6 dB.
Switch for reversing the polarity on the High Output. An LED indi-
cates the selection.
[14]
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 non-
functional in this mode.
[1]
[9]
INPUT GAIN
LOW CUT
Controls the input level with +/- 12 dB of gain.
Switch for selecting the 40 Hz high pass filter. An LED indicates
the selection.
[2]
[10]
[6]
LOW/MID
X10 LED
MID/HIGH
X10 LED
Selects crossover point between LOW and MID frequencies.
Indicates that the LOW/MID crossover range is 450 Hz to 9.6 kHz.
Selects the crossover point between MID and HIGH frequencies.
Indicates that the MID/HIGH crossover frequency range is 450 Hz
to 9.6 kHz
[16]
[3]
LOW OUTPUT
PHASE INVERT
MID OUTPUT
PHASE INVERT
HIGH OUTPUT
PHASE INVERT
MONO
Controls the LOW frequency output level with a range of -∞ to +6
dB.
Switch for reversing the polarity on the Low Output. An LED indi-
cates that the phase is reversed.
Controls the MID frequency output level with a range of -∞ to +6
dB.
Switch for reversing the polarity on the Mid Output. An LED indi-
cates that the phase is reversed.
Controls the HIGH frequency output level with a range of -∞ to +6
dB.
Switch for reversing the polarity on the High Output. An LED indi-
cates that the phase is reversed.
[11]
[7]
[17]
[8]
[18]
[13]
LED indicating mono mode operation.
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2-Way, 3-Way
223/223XL-234/234XL 4-Way Crossovers
6
The mode switches on the back panel of the unit are used to select one
234/234XL-223/223XL REAR
of the three modes of operation in the 234/234XL and one of two modes
PANEL OPERATIONS
of operation in the 223/223XL. There could be disastrous consequences
if the crossover were improperly setup or the switches were mistakenly
pushed during the regular operation of a sound system. Therefore great
care should be taken when setting these switches. There is a mode dia-
gram 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:
MODE SWITCHES
• Know the loudspeaker manufacturer’s requirements regarding the
amplification needs of your particular speaker system. Follow the
maunfacturer’s guidelines carefully, as dbx is not responsible for dam-
age relating to improper setup or implementation of the 234/234XL-
223/223XL.
• Without any audio or power connections in place, use the back panel
switches on the crossover to set it to the proper mode of operation;
either stereo 2-way, stereo 3-way, or mono 4-way for the 234/234XL,
or stereo 2-way or mono 3-way for the 223/223XL.
• Use the literature that came with your speaker system to properly set
up the mode of operation and crossover frequencies to the manufac-
turer’s specifications.
• There is one of the four possible mode button combinations for the
234/234XL which is marked “not valid”. Be sure you have not select-
ed this combination as the 234/234XL will not operate correctly in this
mode.
234XL REAR PANEL
234 REAR PANEL
15 WATTS
CHANNEL TWO
MODE
LF SUM
LOW SUM
LOW SUM
CHANNEL ONE
STEREO 3-WAY
STEREO 2-WAY
HIGH
HIGH
MID
LOW
LOW
LOW/MID
LOW/HIGH
INPUT
INPUT
STEREO 3-WAY
HIGH
HIGH
MID
LOW/LF SUM LOW/MID
LOW/LF SUM LOW/HIGH
INPUT
INPUT
®
NOT USED
STEREO 2-WAY
NOT VALID
NOT USED
x
x
1
NORMAL
SUMMED
x
x
1
10
10
PROFESSIONAL PRODUCTS
A
HARMAN INTERNATIONAL
COMPANY
SALT LAKE CITY, UTAH
MADE IN USA
MODEL 234
XOVER FREQ
NOT USED
XOVER FREQ
100V
120V
50/60Hz
60Hz
MONO 4-WAY
HIGH
HIGH-MID
NOT USED
NOT USED
MONO 4-WAY
ONLY
NOT USED
LOW-MID
LOW
LOW/LOW-MID
INPUT
When you are certain that the proper selections have been made, com-
plete the steps described below and in the “234/234XL-223/223XL Audio
Connections” section on page 7.
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2-Way, 3-Way
223/223XL-234/234XL
4-Way Crossovers
7
On the back panel of the 234/234XL, there are markings to help you con-
nect the source devices and amplifiers to your crossover. To operate the
234/234XL in stereo 3-way operation, follow the top row of markings hori-
zontally along the length of the 234/234XL. For stereo 2-way operation of
the 234/234XL, use the second row of markings directly above the con-
nectors. For mono 4-way operation of the 234/234XL, use the markings
directly below the connectors. The connectors not used in the selected
mode are marked “not used”. This designation applies only to that mode
of operation.
223XL REAR PANEL
223 REAR PANEL
15 WATTS
CHANNEL TWO
MODE
STEREO
LF SUM
LOW SUM
CHANNEL ONE
®
HIGH
HIGH
LOW
LOW/HIGH
INPUT
HIGH
LOW/LF SUM LOW/HIGH
INPUT
INPUT
x
x
1
STEREO
NORMAL
SUMMED
x
x
1
10
MONO
10
PROFESSIONAL PRODUCTS
HARMAN INTERNATIONAL
A
COMPANY
SALT LAKE CITY, UTAH
MADE IN USA
MODEL 223
XOVER FREQ
MID/HIGH
XOVER FREQ
LOW/MID
100V
120V
50/60Hz
60Hz
MID
NOT USED
MONO
NOT USED
NOT USED
LOW
The 223/223XL is marked in a similar way: for stereo 2-way operation use
the markings above the connectors. To operate the 223/223XL 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 designa-
tion applies only to that mode of operation.
234/234XL-223/223XL
AUDIO CONNECTIONS
• Before connecting anything to the crossover, make sure it is not con-
nected to any power source.
• Be sure that the source device (equalizer, compressor, mixing console,
etc.) for the 234/234XL-223/223XL 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 234/234XL-223/223XL.
ELECTRICAL CONNECTIONS
Ensure that your 223/223XL/234/234XL crossover conforms to the AC
power specifications in your area, by checking the marked voltage spec
on the rear of the unit. Never plug the incorrect voltage into your
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2-Way, 3-Way
223/223XL-234/234XL 4-Way Crossovers
8
crossover, as this may cause severe damage not covered under the dbx
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 (-∞) 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 234/234XL-223/223XL. 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 oper-
ation of the frequency selector from 45-960 Hz to 450 Hz to 9.6 kHz. All
other frequency 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 pow-
ered at the time of the spurious 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 polar-
ity switch is extremely useful for fine tuning your sound system for peak
performance. An LED is activated when the output polarity is reversed.
The other feature accessed on the back panel is “low frequency sum-
ming”. This is useful with systems that utilize mono subwoofers.
LOW FREQUENCY SUMMING
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
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2-Way, 3-Way
223/223XL-234/234XL
4-Way Crossovers
9
anyway, it will not detract from the true stereo picture of the source mate-
rial.
RACK MOUNTING, GROUNDING
AND SAFETY
We have provided 4 rack screws and washers for easy mounting in stan-
dard audio racks. 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 have them cross at 90 degree
angles.
The input and output connectors are balanced/unbalanced 1/4” TRS- type
connectors. The tip of the plug is wired as hot (+), the ring is wired as
cold (-), and the sleeve is wired as the ground or shield.
The 234/234XL-223/223XL crossovers have differentially balanced input
and output circuits. Balanced wiring is recommended, even with unbal-
anced source devices, especially when running long paths. Twin-conduc-
tor, 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
234/234XL-223/223XL 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 fre-
quency from 45 - 960 Hz to 450 Hz - 9.6 kHz.
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223/223XL-234/234XL 4-Way Crossovers
10
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.
• 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 shield-
ed, and that low level wiring is not run parallel to and/or in close proximi-
ty 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.
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11
INPUT:
dbx 234/234XL-223/223XL
Connectors:
Type:
1/4” TRS (223/234) or XLR (234/234XL)
Electronically balanced/unbalanced, RF filtered
Balanced > 50 kΩ, unbalanced > 25 kΩ
+22 dBu typical, balanced or unbalanced
>40 dB, typically > 55 dB at 1 kHz
SPECIFICATIONS
Impedance:
Max Input Level:
CMRR:
OUTPUT (223/234):
Connectors:
Type:
Impedance:
Max Output Level:
1/4” TRS
Impedance-balanced/unbalanced, RF filtered
Balanced 200 Ω, unbalanced 100 Ω
>+21 dBu balanced/unbalanced into 2 kΩ or greater
OUTPUT (223XL/234XL):
Connectors:
Type:
Impedance:
Max Output Level:
XLR
Electronically-balanced/unbalanced, RF filtered
Balanced 60 Ω, unbalanced 30 Ω
>+20 dBu balanced/unbalanced into 600Ω or greater
PERFORMANCE:
Bandwidth:
20 Hz to 20 kHz, +0/-0.5 dB
Frequency Response:
Signal-to-Noise:
< 3 Hz to > 90 kHz, +0/-3 dB
Ref: +4 dBu, 22 kHz measurement bandwidth
Stereo Mode:
> 94 dB
Mono Mode:
> 94 dB
> 94 dB
234/234XL: Low Output:
Low-Mid Output:
Mid Output:
> 93 dB
High-Mid Output:
High Output:
223/223XL: Low Output:
Mid Output:
> 92 dB
> 88 dB
> 94 dB
> 93 dB
> 91 dB
> 90 dB
> 94 dB
High Output:
> 91 dB
Dynamic Range:
THD+Noise:
> 106 dB, unweighted, any output
< 0.004% at +4 dBu, 1 kHz
< 0.04% at +20 dBu, 1 kHz
< -80 dB, 20 Hz to 20 kHz
Interchannel Crosstalk:
CROSSOVER FREQUENCIES:
234/234XL: Stereo Mode:
Low/High:
45 to 960 Hz or 450 Hz to 9.6 kHz (x10 setting)
45 to 960 Hz or 450 Hz to 9.6 kHz (x10 setting)
450 Hz to 9.6 kHz
Low/Mid:
Mid/High:
234/234XL: Mono Mode:
Low/Low-Mid:
Low-Mid/High-Mid:
High-Mid/High:
223/223XL: Stereo Mode:
Low/High:
45 to 960 Hz or 450 Hz to 9.6 kHz (x10 setting)
450 Hz to 9.6 kHz
450 Hz to 9.6 kHz
45 to 960 Hz or 450 Hz to 9.6 kHz (x10 setting)
223/223XL: Mono Mode:
Low/Mid:
Mid/High:
Filter Type:
45 to 960 Hz or 450 Hz to 9.6 kHz (x10 setting)
45 to 960 Hz or 450 Hz to 9.6 kHz (x10 setting)
Linkwitz-Riley, 24 dB/octave, state-variable
FUNCTION SWITCHES:
Front Panel:
Low Cut:
Activates 40 Hz Butterworth, 12 dB/octave high-pass
filter, one switch per channel.
Phase Invert:
Rear Panel:
x10:
Inverts the phase at the output, one switch per output.
Multiplies crossover frequency range by 10, one switch per channel.
Selects stereo/mono and 2/3/4-way operation.
Mode:
LF Sum:
Selects normal (stereo) or mono-summed low frequency operation.
INDICATORS:
Stereo Operation:
Mono Operation:
Low Cut:
x10:
Phase Invert:
Green LED
Yellow LED
Red LED per channel
Green LED per channel
Red LED per output (3 per channel)
POWER SUPPLY:
Operating Voltage:
100 VAC 50/60 Hz, 120 VAC 60 Hz
230 VAC 50/60 Hz
Power Consumption:
Mains Connection:
15 Watts
IEC 320 receptacle
PHYSICAL:
Dimensions:
Weight:
Shipping Weight:
1.75” H X 19” W X 6.9” D (4.4cm x 48.3cm x 17.5cm)
234/234XL: 4.0 lbs. (1.8 kg) 223/223XL: 3.7 lbs. (1.7 kg)
234/234XL: 5.8 lbs. (2.6 kg) 223/223XL: 5.4 lbs. (2.5 kg)
Note: Specifications subject to change.
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223/223XL-234/234XL 4-Way Crossovers
12
DECLARATION OF CONFORMITY
Manufacturer’s Name:
Manufacturer’s Address:
dbx Professional Products
8760 S. Sandy Parkway
Sandy, Utah 84070, USA
declares that the product:
Product name:
dbx223 and dbx234
None
Product option:
conforms to the following Product Specifications:
Safety:
EN 60065 (1993)
IEC65 (1985) with Amendments 1, 2, 3
CAN/CSA E65-94
EMC:
EN 55013 (1990)
EN 55020 (1991)
Supplementary Information:
The product herewith complies with the requirements of the Low Voltage Directive 72/23/EEC and the
EMC Directive 89/336/EEC as amended by Directive 93/68/EEC.
dbx Professional Products
Vice-President of Engineering
8760 S. Sandy Parkways
Sandy, Utah 84070, USA
February 6, 1997
European Contact:
Your local dbx Sales and Service Office or
Harman Music Group
8760 South Sandy Parkway
Sandy, Utah
84070 USA
(801) 568-7638
(801) 568-7642
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223/223XL-234/234XL
4-Way Crossovers
13
DECLARATION OF CONFORMITY
Manufacturer’s Name:
Manufacturer’s Address:
dbx Professional Products
8760 S. Sandy Parkway
Sandy, Utah 84070, USA
declares that the product:
Product name:
dbx223XL and dbx234XL
None
Product option:
conforms to the following Product Specifications:
Safety:
EN 60065 (1993)
IEC65 (1985) with Amendments 1, 2, 3
CAN/CSA E65-94
EMC:
EN 55013 (1990)
EN 55020 (1991)
Supplementary Information:
The product herewith complies with the requirements of the Low Voltage Directive 72/23/EEC and the
EMC Directive 89/336/EEC as amended by Directive 93/68/EEC.
dbx Professional Products
Vice-President of Engineering
8760 S. Sandy Parkways
Sandy, Utah 84070, USA
March 9, 1999
European Contact:
Your local dbx Sales and Service Office or
Harman Music Group
8760 South Sandy Parkway
Sandy, Utah
84070 USA
(801) 568-7638
(801) 568-7642
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®
8760 South Sandy Pkwy.
Sandy, Utah 84070
Phone: (801) 568-7660
Fax: (801) 568-7662
Int’l Fax: (219) 462-4596
A Harman International Company
Questions or comments?
E•mail us at: [email protected]
or visit our World Wide Web home page at:
This manual is
dbx part number: 18-2155-C
03/19/99
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