Harman Kardon Portable Speaker 223 223XL User Manual

2-Way, 3-Way  
223/223XL-234/234XL  
4-Way Crossovers  
Operation  
Manual  
®
 
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:  
 
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.  
®
 
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.  
®
 
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.  
®
 
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.  
®
 
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.  
®
 
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  
®
 
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  
®
 
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.  
®
 
2-Way, 3-Way  
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.  
®
 
2-Way, 3-Way  
223/223XL-234/234XL  
4-Way Crossovers  
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 k, 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 , unbalanced 100 Ω  
>+21 dBu balanced/unbalanced into 2 kor greater  
OUTPUT (223XL/234XL):  
Connectors:  
Type:  
Impedance:  
Max Output Level:  
XLR  
Electronically-balanced/unbalanced, RF filtered  
Balanced 60 , unbalanced 30 Ω  
>+20 dBu balanced/unbalanced into 600or 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.  
®
 
2-Way, 3-Way  
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  
 
2-Way, 3-Way  
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  
 
®
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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