dbx 234 Operation Manual

2-Way, 3-Way,

4-Way Crossovers234/223

Operation

Manual

C A U T I O N

RISK OF ELECTRIC SHOCK

DO NOT OPEN

ATTENTION: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR

WARNING: 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 owner’s 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 manufacturer’s 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.

WARNING

FOR YOUR PROTECTION, PLEASE READ THE FOLLOWING:

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

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 CIRCUM-

STANCES 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.

ELECTROMAGNETIC COMPATIBILITY

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.

WARNING: THIS APPLIANCE MUST BE EARTHED.

The cores in the mains lead are coloured in accordance with the following code:

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.

DECLARATION OF CONFORMITY

Manufacturer’s Name:	dbx Professional Products
Manufacturer’s Address:	8760 S. Sandy Parkway
	Sandy, Utah 84070, USA
declares that the products:

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: [phone]

Fax: [phone]

2-Way, 3-Way,	1
4-Way Crossovers234/223

	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: [phone]

Fax: [phone]

Int’l Fax: [phone]

A Harman International Company

Questions or comments?

E•mail us at: [e-mail]

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.

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.

WARRANTY

INTRODUCTION

2-Way, 3-Way,

4-Way Crossovers234/223

2-Way, 3-Way,

3

4

-

Way

Crossovers

234/223

We are sure you will agree that these crossovers are built to provide

extremely high quality frequency division for all applications.

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 and 234 boxes you should find the following:

• 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			3	4		5	6		7	8			9	10			11	12
C H A N N E L O N E											C H A N N E L T W O
0		240			2.4k	-10		-10	-10		0	240			2.4k	-10			-10		-10
		140	350	1.4k	3.5k							140	350	1.4k	3.5k
-6	+6				-30						-6	+6			-30
		70	680	700		0	-30	0	-30	0		70	680	700			0	-30	0	-30	0
	40 Hz				6.8k										6.8k
						INV		INV		INV		40 Hz						INV		INV	INV
			x10			- dB +6	-		- dB +6				x10			- dB +6		-		-
-12 dB +12		45 Hz	960	450	Hz 9.6k			dB +6			-12 dB +12	45 Hz	960	450	Hz 9.6k				dB +6		dB +6
GAIN		XOVER FREQ		XOVER FREQ		GAIN		GAIN	GAIN		GAIN	XOVER FREQ		XOVER FREQ		GAIN			GAIN		GAIN
INPUT	LOW CUT	LOW/LOW-MID		LOW-MID/HIGH-MID		LOW OUTPUT	LOW-MID OUTPUT			MONO				HIGH-MID/HIGH				HIGH-MID OUTPUT		HIGH OUTPUT
INPUT	LOW CUT	LOW/MID		MID/HIGH		LOW OUTPUT	MID OUTPUT		HIGH OUTPUT	STEREO	INPUT	LOW CUT LOW/MID		MID/HIGH		LOW OUTPUT		MID OUTPUT		HIGH OUTPUT

2/3/4-Way Crossover234

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]	INPUT GAIN	Controls the INPUT level with +/- 12 dB of gain.
[13] & [20]	LOW CUT	Switch for selecting the 40 Hz high pass filter. An LED indicates the
		selection.
[2] & [8]	LOW/MID*	Selects crossover point between the LOW and HIGH outputs.
[14] & [21]	X10 LED	Indicates that the LOW/HIGH crossover frequency range is 450 Hz to
		9.6 kHz.
[4] & [10]	LOW OUTPUT	Controls the Low frequency output level with a range of -° to +6 dB.
[15] & [22]	PHASE INVERT	Switch for reversing the polarity on the Low Output. An LED indicates
		that the phase is inverted.
[6] & [12]	HIGH OUTPUT	Controls the High frequency output with a range of -° to +6 dB.
[17] & [24]	PHASE INVERT	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.