Dbx | 223 | Owner`s manual | dbx 223 Owner`s manual

2-Way, 3-Way,
4-Way Crossovers
234/223
Operation
Manual
WARNING
CAUTION
FOR YOUR PROTECTION, PLEASE READ THE FOLLOWING:
RISK OF ELECTRIC SHOCK
DO NOT OPEN
A T T E N T I O N : RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR
W A R N I N G : TO REDUCE THE RISK OF FIRE OR ELECTRIC
SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE
The symbols shown above are internationally accepted symbols that warn of
potential hazards with electrical products. The lightning flash with arrowpoint in
an equilateral triangle means that there are dangerous voltages present within
the unit. The exclamation point in an equilateral triangle indicates that it is necessary for the user to refer to the ownerÕs manual.
These symbols warn that there are no user serviceable parts inside the unit.
Do not open the unit. Do not attempt to service the unit yourself. Refer all servicing to qualified personnel. Opening the chassis for any reason will void the
manufacturerÕs warranty. Do not get the unit wet. If liquid is spilled on the unit,
shut it off immediately and take it to a dealer for service. Disconnect the unit
during storms to prevent damage.
WATER AND MOISTURE: Appliance should not be used near water (e.g. near a
bathtub, washbowl, kitchen sink, laundry tub, in a wet basement, or near a swimming
pool, etc). Care should be taken so that objects do not fall and liquids are not spilled
into the enclosure through openings.
POWER SOURCES: The appliance should be connected to a power supply only of
the type described in the operating instructions or as marked on the appliance.
GROUNDING OR POLARIZATION: Precautions should be taken so that the grounding or polarization means of an appliance is not defeated.
POWER CORD PROTECTION: Power supply cords should be routed so that they are
not likely to be walked on or pinched by items placed upon or against them, paying
particular attention to cords at plugs, convenience receptacles, and the point where
they exit from the appliance.
SERVICING: To reduce the risk of fire or electric shock, the user should not attempt to
service the appliance beyond that described in the operating instructions. All other
servicing should be referred to qualified service personnel.
FOR UNITS EQUIPPED WITH EXTERNALLY ACCESSIBLE FUSE RECEPTACLE:
Replace fuse with same type and rating only.
U.K. MAINS PLUG WARNING
ELECTROMAGNETIC COMPATIBILITY
A moulded mains plug that has been cut off from the cord is unsafe. Discard the
mains plug at a suitable disposal facility. NEVER UNDER ANY CIRCUMSTANCES SHOULD YOU INSERT A DAMAGED OR CUT MAINS PLUG INTO
A 13 AMP POWER SOCKET. Do not use the mains plug without the fuse cover
in place. Replacement fuse covers can be obtained from your local retailer.
Replacement fuses are 13 amps and MUST be ASTA approved to BS1362.
This unit conforms to the Product Specifications noted on the Declaration of
Conformity. Operation is subject to the following two conditions:
¥ this device may not cause harmful interference, and
¥ this device must accept any interference received, including interference
that may cause undesired operation.
Operation of this unit within significant electromagnetic fields should be avoided.
Use only shielded interconnecting cables.
SAFETY INSTRUCTIONS
NOTICE FOR CUSTOMERS IF YOUR UNIT IS EQUIPPED WITH A POWER
CORD.
DECLARATION OF CONFORMITY
ManufacturerÕs Name:
ManufacturerÕs Address:
WARNING: THIS APPLIANCE MUST BE EARTHED.
dbx Professional Products
8760 S. Sandy Parkway
Sandy, Utah 84070, USA
The cores in the mains lead are coloured in accordance with the following code:
declares that the products:
GREEN and YELLOW - Earth
BLUE - Neutral
BROWN - Live
As colours of the cores in the mains lead of this appliance may not correspond
with the coloured markings identifying the terminals in your plug, proceed as follows:
¥ The core which is coloured green and yellow must be connected to the
terminal in the plug marked with the letter E, or with the earth symbol, or
coloured green, or green and yellow.
¥ The core which is coloured blue must be connected to the terminal
marked N or coloured black.
¥ The core which is coloured brown must be connected to the terminal
marked L or coloured red.
This equipment may require the use of a different line cord, attachment plug, or
both, depending on the available power source at installation. If the attachment
plug needs to be changed, refer servicing to qualified service personnel who
should refer to the table below. The green/yellow wire shall be connected
directly to the unit's chassis.
CONDUCTOR
WIRE COLOR
Normal
Alt
L
LIVE
BROWN
BLACK
N
NEUTRAL
BLUE
WHITE
E EARTH GND GREEN/YEL
GREEN
WARNING: If the ground is defeated, certain fault conditions in the unit or in the
system to which it is connected can result in full line voltage between chassis
and earth ground. Severe injury or death can then result if the chassis and
earth ground are touched simultaneously.
dbx 223, 234
conform to the following Product Specifications:
Safety:
EN 60065 (1993)
IEC65 (1985) with Amendments 1, 2, 3
EMC:
EN 55013 (1990)
EN 55020 (1991)
Supplementary Information:
The product herewith complies with the requirements of the
Low Voltage Directive 73/23/EEC and the EMC Directive
90/336/EEC as amended by Directive 93/68/EEC.
dbx Professional Products
Vice-President of Engineering
8760 S. Sandy Parkway
Sandy, Utah 84070, USA
February 6, 1997
European Contact: Your Local dbx Sales and Service Office or
International Sales Office
68 Sheila Lane
Valparaiso, Indiana
46383, USA
Tel: (219) 462-0938
Fax: (219) 462-4596
2-Way, 3-Way,
4-Way Crossovers
1
234/223
TABLE OF CONTENTS
WARRANTY ...............................................................................................................................................................2
INTRODUCTION .......................................................................................................................................................2
INSPECTION ...........................................................................................................................................................3
234 FRONT PANEL OPERATION .............................................................................................................................3
223 FRONT PANEL OPERATION ..............................................................................................................................5
234/223 REAR PANEL OPERATIONS .......................................................................................................................6
234/223 AUDIO CONNECTIONS .............................................................................................................................7
ELECTRICAL CONNECTIONS .............................................................................................................................................7
FEATURES ...........................................................................................................................................................................7
RACK MOUNTING, GROUNDING AND SAFETY ...............................................................................................................8
TROUBLESHOOTING ..........................................................................................................................................................9
234/223 SPECIFICATIONS .................................................................................................................................................10
NOTES ................................................................................................................................................................................11
DECLARATION OF CONFORMITY ....................................................................................................................................13
¨
8760 South Sandy Pkwy.
Sandy, Utah 84070
Phone: (801) 568-7660
Fax: (801) 568-7662
IntÕl Fax: (219) 462-4596
A Harman International Company
Questions or comments?
E¥mail us at: customer@dbxpro.com
or visit our World Wide Web home page at:
http://www.dbxpro.com
2
1. The warranty registration card that accompanies this product must be
mailed within 30 days after purchase date to validate this warranty.
Proof-of-purchase is considered to be the burden of the consumer.
WARRANTY
2. dbx warrants this product, when bought and used solely within the
U.S., to be free from defects in materials and workmanship under normal use and service.
3. dbx liability under this warranty is limited to repairing or, at our discretion, replacing defective materials that show evidence of defect, provided the product is returned to dbx WITH RETURN AUTHORIZATION
from the factory, where all parts and labor will be covered up to a period of two years. A Return Authorization number must be obtained from
dbx by telephone. The company shall not be liable for any consequential 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 product. In no event shall dbx or its dealers be liable for special or consequential damages or from any delay in the performance of this warranty due to causes beyond their control.
Congratulations on your purchase of the dbx 223 or 234 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 and the 223 crossovers are:
¥ back panel switches for selecting the operating mode of the
crossover.
¥ back panel switches indicating the selected range of crossover frequencies. 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 subwoofer applications.
¥ phase invert switches on all outputs.
¥ individual level controls on every output.
2-Way, 3-Way,
4-Way Crossovers
234/223
INTRODUCTION
2-Way, 3-Way,
4-Way Crossovers
3
234/223
We are sure you will agree that these crossovers are built to provide
extremely high quality frequency division for all applications.
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 and 234 boxes you should find the following:
INSPECTION
¥
¥
¥
¥
either the dbx model 223, or 234 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 Front Panel
1
2
C H A N N E L
3
5
6
7
140
8
C H A N N E L
240
0
-6
4
O N E
-10
2.4k
1.4k
350
70
680
-10
-10
0
240
3.5k
+6
40 Hz
-30
0
-30
0
INV
INV
350
dB
GAIN
INPUT
INPUT
45
+12
Hz
960
XOVER FREQ
LOW CUT LOW/LOW-MID
LOW CUT
LOW/MID
13
1.4k
70
INV
11
12
-10
680
-10
-10
3.5k
+6
0
-30
6.8k
700
40 Hz
x10
-12
10
2.4k
140
-6
-30
6.8k
700
9
T W O
-30
0
-30
0
INV
0
INV
INV
2/3/4-Way
Crossover
x10
450
Hz
9.6k
XOVER FREQ
LOW-MID/HIGH-MID
MID/HIGH
-
dB
-
+6
GAIN
LOW OUTPUT
LOW OUTPUT
14
15
dB
-
+6
GAIN
LOW-MID OUTPUT
MID OUTPUT
16
dB
+6
-12
GAIN
HIGH OUTPUT
dB
45
+12
GAIN
MONO
STEREO
17 18 19
INPUT
Hz
960
XOVER FREQ
LOW CUT
20
LOW/MID
450
Hz
9.6k
XOVER FREQ
HIGH-MID/HIGH
MID/HIGH
21
-
dB
-
+6
GAIN
LOW OUTPUT
dB
-
+6
GAIN
HIGH-MID OUTPUT
MID OUTPUT
22
23
dB
+6
GAIN
HIGH OUTPUT
HIGH OUTPUT
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
[2] & [8]
[14] & [21]
LOW/MID*
X10 LED
[4] & [10]
[15] & [22]
LOW OUTPUT
PHASE INVERT
[6] & [12]
[17] & [24]
HIGH OUTPUT
PHASE INVERT
[19]
STEREO
Controls the INPUT level with +/- 12 dB of gain.
Switch for selecting the 40 Hz high pass filter. An LED indicates the
selection.
Selects crossover point between the LOW and HIGH outputs.
Indicates that the LOW/HIGH crossover frequency range is 450 Hz to
9.6 kHz.
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.
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.
LED indicating stereo mode operation.
* although this control is labeled as ÒLOW/MIDÓ, it operates as the crossover frequency control between low and
high frequencies in stereo 2-way operation.
234
4
1
2
C H A N N E L
3
5
6
7
O N E
0
8
C H A N N E L
240
140
-6
4
-10
2.4k
1.4k
350
680
-10
240
-30
0
-30
0
INV
350
70
INV
680
dB
GAIN
INPUT
INPUT
#
A
FRONT ART (
+12
45
Hz
960
XOVER FREQ
LOW CUT LOW/LOW-MID
LOW CUT
LOW/MID
13) b
ff
12
-10
-10
3.5k
-30
6.8k
700
40 Hz
x10
-12
1.4k
+6
0
INV
11
-10
2.4k
140
-6
-30
6.8k
700
40 Hz
10
T W O
0
3.5k
+6
70
-10
9
-30
0
-30
0
INV
0
INV
INV
2/3/4-Way
Crossover
x10
450
Hz
9.6k
-
XOVER FREQ
LOW-MID/HIGH-MID
MID/HIGH
dB
-
+6
GAIN
LOW OUTPUT
LOW OUTPUT
14
15
dB
-
+6
GAIN
LOW-MID OUTPUT
MID OUTPUT
16
dB
+6
-12
GAIN
dB
+12
45
GAIN
HIGH OUTPUT
MONO
STEREO
17 18 19
INPUT
Hz
960
XOVER FREQ
LOW CUT
20
LOW/MID
21
450
Hz
9.6k
XOVER FREQ
HIGH-MID/HIGH
MID/HIGH
-
dB
-
+6
GAIN
LOW OUTPUT
dB
-
+6
GAIN
HIGH-MID OUTPUT
MID OUTPUT
22
23
dB
+6
234
GAIN
HIGH OUTPUT
HIGH OUTPUT
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 nonfunctional in this mode.
[1] & [7]
[13] & [20]
INPUT GAIN
LOW CUT
[2] & [8]
[14] & [21]
[3] & [9]
[4] & [10]
[15] & [22]
LOW/MID
X10 LED
MID/HIGH
LOW OUTPUT
PHASE INVERT
[5] & [11]
[16] & [23]
MID OUTPUT
PHASE INVERT
[6] & [12]
[17] & [24]
HIGH OUTPUT
PHASE INVERT
[19]
STEREO
Controls the INPUT level with +/- 12 dB of gain.
Switch for selecting the 40 Hz high pass filter. An LED indicates the selection.
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.
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.
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.
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
[2]
[14]
LOW/LOW-MID
X10 LED
[3]
[9]
[4]
[15]
LOW-MID/HIGH-MID
HIGH-MID/HIGH
LOW OUTPUT
PHASE INVERT
[5]
[16]
LOW-MID OUTPUT
PHASE INVERT
[11]
[23]
HIGH-MID OUTPUT
PHASE INVERT
[12]
[24]
HIGH OUTPUT
PHASE INVERT
[18]
MONO
2-Way, 3-Way,
4-Way Crossovers
234/223
Controls the input level with +/- 12 dB of gain.
Switch for selecting the 40 Hz high pass filter. An LED indicates the
selection.
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.
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.
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.
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.
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.
LED indicating mono mode operation.
2-Way, 3-Way,
4-Way Crossovers
5
234/223
dbx 223 Front Panel
1
2
C H A N N E L
3
5
140
6
C H A N N E L
-10
240
0
-6
4
O N E
-10
140
-6
-30
680
70
40 Hz
-30
0
-30
680
70
INV
40 Hz
dB
GAIN
INPUT
INPUT
45
+12
LOW CUT
LOW CUT
Hz
960
XOVER FREQ
LOW/MID
LOW/HIGH
9
-30
0
0
INV
INV
Stereo 2-Way/Mono
3-Way Crossover
x10
x10
-12
-10
350
+6
0
INV
8
-10
240
0
350
+6
7
T W O
-
dB
-
+6
GAIN
LOW OUTPUT
LOW OUTPUT
10
dB
-12
+6
GAIN
45
+12
GAIN
HIGH OUTPUT
11
dB
MONO
STEREO
12 13 14
INPUT
LOW CUT
15
Hz
960
XOVER FREQ
MID/HIGH
LOW/HIGH
-
dB
-
+6
GAIN
MID OUTPUT
LOW OUTPUT
16
dB
+6
GAIN
HIGH OUTPUT
HIGH OUTPUT
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
[2] & [6]
[10] & [16]
X10
[3] & [7]
LOW OUTPUT
[11] & [17]
PHASE INVERT
[4] & [8]
[12] & [18]
HIGH OUTPUT
PHASE INVERT
[14]
STEREO
LOW/HIGH
LED
Controls the INPUT level with +/- 12 dB of gain.
Switch for selecting the 40 Hz high pass filter. An LED indicates
the selection.
Selects crossover point between the LOW and HIGH outputs.
Indicates that the LOW/HIGH crossover frequency range is 450
Hz to 9.6 kHz.
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.
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.
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 nonfunctional in this mode.
[1]
[9]
[2]
[10]
[6]
[16]
INPUT GAIN
LOW CUT
LOW/MID
LED
MID/HIGH
X10 LED
X10
[3]
LOW OUTPUT
[11]
PHASE INVERT
[7]
MID OUTPUT
[17]
PHASE INVERT
[8]
HIGH OUTPUT
[18]
PHASE INVERT
[13]
MONO
Controls the input level with +/- 12 dB of gain.
Switch for selecting the 40 Hz high pass filter. An LED indicates
the selection.
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
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 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 indicates 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 indicates that the phase is reversed.
LED indicating mono mode operation.
223
6
The mode switches on the back panel of the unit are used to select one
of the three modes of operation in the 234 and one of two modes of operation in the 223. 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 diagram
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:
234/223 REAR PANEL
OPERATIONS
MODE SWITCHES
¥ Know the loudspeaker manufacturerÕs requirements regarding the
amplification needs of your particular speaker system. Follow the
maunfacturerÕs guidelines carefully, as dbx is not responsible for damage relating to improper setup or implementation of the 234/223.
¥ 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, or
stereo 2-way or mono 3-way for the 223.
¥ Use the literature that came with your speaker system to properly set
up the mode of operation and crossover frequencies to the manufacturerÕs specifications.
¥ There is one of the four possible mode button combinations for the
234 which is marked Ònot validÓ. Be sure you have not selected this
combination as the 234 will not operate correctly in this mode.
When you are certain that the proper selections have been made, complete the steps described below and in the Ò234/223 Audio ConnectionsÓ
section on page 7.
15 WATTS
¨
STEREO 3-WAY
STEREO 2-WAY
CHANNEL TWO
HIGH
HIGH
MID
NOT USED
LOW
LOW
A HARMAN INTERNATIONAL
COMPANY
SALT LAKE CITY, UTAH
MADE IN USA
MODEL 234
INPUT
INPUT
x1
x 10
PROFESSIONAL PRODUCTS
100V
50/60Hz
120V
60Hz
MODE
LOW/MID
LOW/HIGH
STEREO 3-WAY
STEREO 2-WAY
NOT VALID
234 REAR PANEL
HIGH
HIGH
MID
NOT USED
LOW/LF SUM
LOW/LF SUM
XOVER FREQ
MONO 4-WAY
HIGH
HIGH-MID
NOT USED
NOT USED
234/223
LOW/MID
LOW/HIGH
INPUT
INPUT
x1
x 10
NORMAL
SUMMED
XOVER FREQ
NOT USED
MONO 4-WAY
ONLY
On the back panel of the 234, there are markings to help you connect the
source devices and amplifiers to your crossover. To operate the 234 in
stereo 3-way operation, follow the top row of markings horizontally along
the length of the 234. For stereo 2-way operation of the 234, use the second row of markings directly above the connectors. For mono 4-way
operation of the 234, use the markings directly below the connectors. The
2-Way, 3-Way,
4-Way Crossovers
CHANNEL ONE
LF SUM
LOW SUM
LOW SUM
NOT USED
LOW-MID
LOW
LOW/LOW-MID
INPUT
2-Way, 3-Way,
4-Way Crossovers
7
234/223
connectors not used in the selected mode are marked Ònot usedÓ. This
designation applies only to that mode of operation.
223 REAR PANEL
15 WATTS
CHANNEL TWO
¨
HIGH
LOW
100V
50/60Hz
120V
60Hz
INPUT
x1
x 10
PROFESSIONAL PRODUCTS
A HARMAN INTERNATIONAL
COMPANY
SALT LAKE CITY, UTAH
MADE IN USA
MODEL 223
LOW/HIGH
MODE
LF SUM
STEREO
LOW SUM
STEREO
MONO
CHANNEL ONE
HIGH
LOW/LF SUM
NORMAL
SUMMED
MID
MID/HIGH
INPUT
x1
x 10
XOVER FREQ
HIGH
LOW/HIGH
XOVER FREQ
NOT USED
MONO
NOT USED
NOT USED
LOW
LOW/MID
INPUT
The 223 is marked in a similar way: for stereo 2-way operation use the
markings above the connectors. To operate the 223 in mono 3-way mode
use the markings below the connectors. The connectors which are not
used in the selected mode are marked Ònot usedÓ. This designation
applies only to that mode of operation.
234/223 AUDIO CONNECTIONS
¥ Before connecting anything to the crossover, make sure it is not connected to any power source.
¥ Be sure that the source device (equalizer, compressor, mixing console,
etc.) for the 234/223 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 234/223.
ELECTRICAL CONNECTIONS
Ensure that your 223/234 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 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.
FEATURES
X10
OPERATION
After you have safely plugged in the crossover, turn on the source
device(s). Turn the amplifiersÕ 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 234/223. Slowly turn up the amplifiersÕ outputs until you can hear signal at a comfortable volume. Make adjustments as you desire.
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
8
set the x10 switch to the active position. This changes the range of operation 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 powered at the time of the spurious signal.
Every output is equipped with a polarity (¯) reverse switch on the front
panel. When speakers are not Òin phaseÓ, the frequency response of the
system is compromised, particularly in the low frequencies. Out of phase
signals can also cause Òcomb-filteringÓ 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.
POLARITY SWITCH
The other feature accessed on the back panel is Òlow frequency summingÓ. This is useful with systems that utilize mono subwoofers.
Activating the LF sum switch ÒsumsÓ the low frequencies of both the left
and right inputs. The sum is sent to channel oneÕs low output marked ÒLF
SUMÓ, while channel twoÕs low output is not used, and channel twoÕs
phase invert led is disabled, indicating it is not operational in ÒLF SumÓ
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.
LOW FREQUENCY SUMMING
We have provided 4 rack screws and washers for easy mounting in standard 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.
RACK MOUNTING, GROUNDING
AND SAFETY
The input and output connectors are balanced/unbalanced 4Ó 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 234/223 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
2-Way, 3-Way,
4-Way Crossovers
234/223
2-Way, 3-Way,
4-Way Crossovers
9
234/223
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
234/223 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 crossoverÕs
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 amplifiersÕ 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 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
10
shielded, and that low level wiring is not run parallel to and/or in close
proximity to AC power wiring.
¥ 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,
4-Way Crossovers
234/223
INTERMITTENT AUDIO
2-Way, 3-Way,
4-Way Crossovers
11
234/223
dbx 234/223 SPECIFICATIONS
INPUT:
Connectors:
Type:
Impedance:
Max Input Level:
CMRR:
1/4Ó TRS
Electronically balanced/unbalanced, RF filtered
Balanced > 50 k½, unbalanced > 25 k½
+22 dBu typical, balanced or unbalanced
>40 dB, typically > 55 dB at 1 kHz
OUTPUT:
Connectors:
Type:
Impedance:
Max Output Level:
1/4Ó TRS
Impedance-balanced/unbalanced, RF filtered
Balanced 200 ½, unbalanced 100 ½
>+21 dBu balanced/unbalanced into 2 k½ or greater
PERFORMANCE:
Bandwidth:
Frequency Response:
Signal-to-Noise:
234: Low Output:
Low-Mid Output:
Mid Output:
High-Mid Output:
High Output:
223: Low Output:
Mid Output:
High Output:
Dynamic Range:
THD+Noise:
Interchannel Crosstalk:
20 Hz to 20 kHz, +0/-0.5 dB
< 3 Hz to > 90 kHz, +0/-3 dB
Ref: +4 dBu, 22 kHz measurement bandwidth
Stereo Mode:
Mono Mode:
> 94 dB
> 94 dB
> 94 dB
> 93 dB
> 92 dB
> 90 dB
> 88 dB
> 94 dB
> 94 dB
> 93 dB
> 91 dB
> 91 dB
>
<
<
<
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
CROSSOVER FREQUENCIES:
234: Stereo Mode:
Low/High:
Low/Mid:
Mid/High:
234: Mono Mode:
Low/Low-Mid:
Low-Mid/High-Mid:
High-Mid/High:
223: Stereo Mode:
Low/High:
223: 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)
450 Hz to 9.6 kHz
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)
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:
Phase Invert:
Rear Panel:
x10:
Mode:
LF Sum:
Activates 40 Hz Butterworth, 12 dB/octave high-pass
filter, one switch per channel.
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.
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:
Power Consumption:
Mains Connection:
100 VAC 50/60 Hz, 120 VAC 60 Hz
230 VAC 50/60 Hz
15 Watts
IEC 320 receptacle
PHYSICAL:
Dimensions:
Weight:
Shipping Weight:
Note: Specifications subject to change.
1.75Ó H X 19Ó W X 6.9Ó D (4.4cm x 48.3cm x 17.5cm)
234: 4.0 lbs. (1.8 kg) 223: 3.7 lbs. (1.7 kg)
234: 5.8 lbs. (2.6 kg) 223: 5.4 lbs. (2.5 kg)
12
NOTES
2-Way, 3-Way,
4-Way Crossovers
13
234/223
NOTES
¨
8760 South Sandy Pkwy.
Sandy, Utah 84070
Phone: (801) 568-7660
Fax: (801) 568-7662
IntÕl Fax: (219) 462-4596
A Harman International Company
Questions or comments?
E¥mail us at: customer@dbxpro.com
or visit our World Wide Web home page at:
http://www.dbxpro.com
This manual is
dbx part number: 18-2155-B
2/13/97
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