Lectrosonics XO2 User manual

XO2 & XO3
ELECTRONIC CROSSOVER MODULES
OPERATING INSTRUCTIONS
and trouble-shooting guide
LECTROSONICS, INC.
Rio Rancho, NM

INTRODUCTION
The XO2 and XO3 are high quality electronic crossovers for use with bi- or tri-amped loudspeaker systems. The
XO2 is a two-way crossover, while the XO3 is a three-way crossover. Crossover frequencies are fully adjustable,
and level controls are included to match sound pressure levels from individual drivers.
The XO2 and XO3 each occupy one standard width in a Modular Audio Processor mainframe. All controls are
recessed, and are covered by a supplied panel to prevent accidental misadjustment.
TABLE OF CONTENTS
1

GENERAL TECHNICAL DESCRIPTION
The XO2 and XO3 both use 24dB/octave Linkwitz-Riley aligned state variable active filters. The Linkwitz-Riley
alignment minimizes lobing error. This alignment also provides a high out of band slope rate to assure that each
driver recieves only the desired frequencies, thus lowering distortion.
A balanced, RF filtered, XLR type input feeds the filter sections. In the XO2, one filter section is used to split the
audio spectrum into two bands. The low frequency output comes out at unity gain, while the high frequency output
has a level control with a range from 6dB of gain to off.
In the XO3, the low frequency output again comes out at unity gain. Two filter sections are used to split the audio
spectrum into 3 bands. Both the mid and high frequency outputs have a level control with a range from 6dB gain to
off.
The range of crossover frequencies for both the XO2 and XO3 is continuously variable from 90-900Hz in the x1
mode and 900-9kHz in the x10 mode.
INSTALLATION
The XO2 or XO3 module is installed from the rear of the Modular Audio Processor mainframe. The printed circuit
board fits into one of the ten sets of card guides provided in the mainframe. The module is then slid forward in the
mainframe until the female edge connector on the module board is firmly seated on the male pins of the male bus
board. Care should be taken when inserting the edge connector onto the pins to be sure there is correct alignment.
Two #4 machine screws are provided to fasten the rear panel to the top and bottom rear rails of the Modular Audio
Processor mainframe. In addition, two #4 countersink machine screws are provided to secure the cover panel, also
supplied, on the front of the Modular Audio Processor mainframe after system adjustment is complete.
2

FRONT PANEL DESCRIPTION
XO2 Front Panel:
LOW/HIGH CROSSOVER FREQUENCY - Sets the
crossover frequency between high and low outputs.
Continuously variable over a one decade range.
RANGE SWITCH - Sets the range over which the
Low/High Crossover Frequency control operates. In the
x1 position, the range is 90-900Hz. In the x10 position,
the range is 900Hz-9kHz.
HF OUTPUT LEVEL - Controls the gain of the high
frequency output. Gain range is from 6dB of gain to off.
XO3 Front Panel:
LOW/MID CROSSOVER FREQUENCY - Sets the
crossover frequency between low and mid outputs.
Continuously variable over a one decade range.
RANGE SWITCH - Sets the range over which the
Low/Mid Crossover Frequency control operates. In the
x1 position, the range is 90-900Hz. In the x10 position,
the range is 900Hz-9kHz.
MF OUTPUT LEVEL - Controls the gain of the mid
frequency output. Gain range is from 6dB of gain to off.
MID/HIGH CROSSOVER FREQUENCY - Sets the
crossover frequency between mid and high outputs.
Continuously variable over a one decade range.
RANGE SWITCH - Sets the range over which the
Mid/High Crossover Frequency control operates. In the
x1 position, the range is 90-900Hz. In the x10 position,
the range is 900Hz-9kHz.
HF OUTPUT LEVEL - Controls the gain of the high
frequency output. Gain range is from 6dB of gain to off.
CROSSOVER CROSSOVER
0
+3
+6
-6
RANGE
X10
X1
Hz
90
250
400
600
900
-6
+6
+3
0
X10
RANGE
X1
900
600
400
250
90
Hz
Hz
90
250
400
600
900
0
+3
+6
-6
RANGE
X10
X1
HF
OUTPUT
LEVEL
MF
OUTPUT
LEVEL
XO2 XO3
LOW/HIGH
CROSSOVER
FREQUENCY
LOW/MID
CROSSOVER
FREQUENCY
MID/HI
CROSSOVER
FREQUENCY
HF
OUTPUT
LEVEL
Figure 1 - XO2 and XO3 Front Panels
3

REAR PANEL DESCRIPTION
XO2 Rear Panel:
INPUT - Provides a balanced, RF filtered, XLR type line
level input to the XO2.
HF OUTPUT - Provides a balanced and floating, RF
filtered, XLR type line level output of frequencies in the
high frequency band of the audio spectrum.
LF OUTPUT - Provides a balanced and floating, RF
filtered, XLR type line level output of frequencies in the
low frequency band of the audio spectrum.
XO3 Rear Panel:
INPUT - Provides a balanced, RF filtered, XLR type line
level input to the XO3.
HF OUTPUT - Provides a balanced and floating, RF
filtered, XLR type line level output of frequencies in the
high frequency band of the audio spectrum.
MF OUTPUT - Provides a balanced and floating, RF
filtered, XLR type line level output of frequencies in the
mid frequency band of the audio spectrum.
LF OUTPUT - Provides a balanced and floating, RF
filtered, XLR type line level output of frequencies in the
low frequency band of the audio spectrum.
OPERATING INSTRUCTIONS
The following instructions assume a properly set up
automatic or standard system.
1) Using the Crossover Frequency controls and the
Range switch, set the correct crossover frequencies for
the loudspeakers in the system. Take care to set the
CORRECT frequency, as excess low frequency energy
can damage high frequency drivers.
2) Adjust the relative levels of the drivers using the
Output Level controls.
INPUT
CROSSOVER
INPUT
HF
OUTPUT
CROSSOVER
XO2 XO3
HF
OUTPUT
MF
OUTPUT
LF
OUTPUT
LF
OUTPUT
1
2
3
1 2
3
1 2
3
1 2
3
1 2
3
1
3
2 1
3
2
Figure 2 - XO2 and XO3 Rear Panels
4

SPECIFICATIONS
Filter Type: 24dB/octave Linkwitz-Riley state variable active filter
Noise (20-20kHz): -90dBu
THD @ +4dBu: Less than 0.02%
IMD @ +4dBu: Less than 0.02%
Gain:
LF Out: unity
MF Out: +6db to off (XO3 only)
HF Out: +6dB to off
Frequency Range: 90-900Hz (x1 position)
900-9kHz (x10 position)
Input Impedance: 20K balanced, 10K unbalanced
Output Impedance: 100 Ohms balanced, 50 Ohms unbalanced
Maximum Input Level: +20dBu
Maximum Output Level: +20dBu
Input/Output Connectors: 3 Pin XLR
Maximum Power Consumption: 100mA at ±15 Volts
5

SERVICE AND REPAIR
If your system malfunctions, you should attempt to correct or isolate the trouble before concluding that the
equipment needs repair. Make sure you have followed the setup procedure and operating instructions. Check out
the inter-connecting cords and then go through the TROUBLE SHOOTING section in the manual
We strongly recommend that you do not try to repair the equipment yourself and do not have the local repair shop
attempt anything other than the simplest repair. If the repair is more complicated than a broken wire or loose
connection, send the unit to the factory for repair and service. Don’t attempt to adjust any controls inside the units.
Once set at the factory, the various controls and trimmers do not drift with age or vibration and never require
readjustment. There are no adjustments inside that will make a malfunctioning unit start working.
LECTROSONICS service department is equipped and staffed to quickly repair your equipment. In-warranty repairs
are made at no charge in accordance with the terms of the warranty. Out of warranty repairs are charged at a
modest flat rate plus parts and shipping. Since it takes almost as much time and effort to determine what is wrong
as it does to make the repair, there is a charge for an exact quotation. We will be happy to quote approximate
charges by phone for out of warranty repairs.
RETURNING UNITS FOR REPAIR
You will save yourself time and trouble if you will follow the steps below:
A. DO NOT return equipment to the factory for repair without first contacting us by letter or by phone. We need to
know the nature of the problem, the model number and the serial number of the equipment. We also need a
phone number where you can be reached 8 am to 4 pm (Mountain Standard Time).
B. After receiving your request, we will issue you a return authorization number (R.A.). This number will help
speed your repair through our receiving and repair departments. The return authorization number must be
clearly shown on the outside of the shipping container.
C. Pack the equipment carefully and ship to us, shipping costs prepaid. If necessary, we can provide you with the
proper packing materials. UPS is usually the best way to ship the units. Heavy units should be "double-boxed"
for safe transport.
D. We also strongly recommend that you insure the equipment, since we cannot be responsible for loss of or
damage to equipment that you ship. Of course, we insure the equipment when we ship it back to you.
Mailing address: Shipping address: Telephones:
Lectrosonics, Inc. Lectrosonics, Inc. (505) 892-4501
PO Box 15900 581 Laser Rd. (800) 821-1121
Rio Rancho, NM 87174 Rio Rancho, NM 87124 FAX: (505) 892-6243
USA USA
6

LIMITED ONE YEAR WARRANTY
The equipment is warranted for one year from date of purchase against defects
in materials or workmanship provided it was purchased from an authorized
dealer. This warranty does not cover equipment which has been abused or
damaged by careless handling or shipping. This warranty does not apply to
used or demonstrator equipment.
Should any defect develop, we will, at our option, repair or replace any
defective parts without charge for either parts or labor. If we cannot correct the
defect in your equipment, we will replace it at no charge with a similar new item.
We will pay for the cost of returning your merchandise to you.
This warranty applies only to items returned to us, shipping costs prepaid, within
one year from the date of purchase.
This warranty gives you specific legal rights. You may have additional legal
rights which vary from state to state.
LECTROSONICS, INC.
581 LASER ROAD
RIO RANCHO, NM 87124 USA August 17, 1996
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