Alto X P234 User`s manual

User's Manual
X P234
2-WAY/3-WAY STEREO
4-WAY MONO
ACTIVE CROSSOVER
R
LTO
www.altoproaudio.com
Version 2.0 Dec. 2002
English
the recommended fuse type as indicated in this
manual. Do not short-circuit the fuse holder. Before
replacing the fuse, make sure that the product is
OFF and disconnected from the AC outlet.
SAFETY RELATED SYMBOLS
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
Protective Ground
This symbol, wherever used, alerts you to the presence of un-insulated and dangerous voltages within the product enclosure. These are voltages that
may be sufficient to constitute the risk of electric
shock or death.
Before turning the product ON, make sure that it is
connected to Ground. This is to prevent the risk of
electric shock.
Never cut internal or external Ground wires. Likewise,
never remove Ground wiring from the Protective
Ground Terminal.
This symbol, wherever used, alerts you to important operating and maintenance instructions.
Please read.
Operating Conditions
Always install in accordance with the manufacturer's
instructions.
Protective Ground Terminal
Denotes the product is turned on.
To avoid the risk of electric shock and damage, do
not subject this product to any liquid/rain or moisture.
Do not use this product when in close proximity to
water.
OFF: Denotes the product is turned off.
Do not install this product near any direct heat source.
WARNING
Do not block areas of ventilation. Failure to do so
could result in fire.
AC mains (Alternating Current)
Hazardous Live Terminal
ON:
Describes precautions that should be observed to
prevent the possibility of death or injury to the user.
Keep product away from naked flames.
IMPORTANT SAFETY INSTRUCTIONS
CAUTION
Read these instructions
Describes precautions that should be observed to
prevent damage to the product.
Follow all instructions
Keep these instructions. Do not discard.
WARNING
Heed all warnings.
Power Supply
Only use attachments/accessories specified by the
manufacturer.
Ensure that the mains source voltage (AC outlet)
matches the voltage rating of the product. Failure
to do so could result in damage to the product and
possibly the user.
Power Cord and Plug
Do not tamper with the power cord or plug. These are
designed for your safety.
Unplug the product before electrical storms occur
and when unused for long periods of time to reduce
the risk of electric shock or fire.
Do not remove Ground connections!
If the plug does not fit your AC outlet seek advice from
a qualified electrician.
External Connection
Always use proper ready-made insulated mains
cabling (power cord). Failure to do so could result
in shock/death or fire. If in doubt, seek advice from
a registered electrician.
Protect the power cord and plug from any physical
stress to avoid risk of electric shock.
Do Not Remove Any Covers
Cleaning
Within the product are areas where high voltages
may present. To reduce the risk of electric shock do
not remove any covers unless the AC mains power
cord is removed.
When required, either blow off dust from the product
or use a dry cloth.
Do not place heavy objects on the power cord. This
could cause electric shock or fire.
Do not use any solvents such as Benzol or Alcohol.
For safety, keep product clean and free from dust.
Covers should be removed by qualified service
personnel only.
Servicing
Refer all servicing to qualified service personnel only.
No user serviceable parts inside.
Do not perform any servicing other than those instructions contained within the User's Manual.
Fuse
To prevent fire and damage to the product, use only
1
Preface
Dear Customer:
Thanks for choosing
and researches.
For our
LTO Active Crossover and thanks for choosing the one of results of
LTO AUDIO TEAM job
LTO AUDIO TEAM, music and sound are more than a job...are first of all passion and let us say...our obsession!
We have been designing professional audio products for a long time in cooperation with some of the major brands in
the world in the audio field.
The LTO line presents unparalleled analogue and digital products made by Musicians for Musicians in our R&D
Centres in Italy, Netherlands, United Kingdom and Taiwan. The core of our digital audio products is a sophisticated
DSP (Digital sound processor) and a large range of state of the art algorithms which have been developed by our
Software Team for the last 7 years.
Because we are convinced you are the most important member of LTO AUDIO TEAM and the one confirming the
quality of our job, we'd like to share with you our work and our dreams, pay attention to your suggestions and your
comments.
Following this idea we create our products and we will create the new ones! From our side, we guarantee you and
we will guarantee you also in future the best quality, the best fruits of our continuous researches and the best prices.
Our LTO Active Crossover is the result of many hours of listening and tests involving common people, area experts,
musicians and technicians.
The results of this effort is an efficient and effective electronic crossover solution, which will give you precise control
superior sound from your loudspeaker system.
Nothing else to add, but that we would like to thank all the people that made the LTO Active Crossover a reality
available to our customers, and thank our designers and all the LTO staff, there to make possible the realization
of products containing our idea of music and sound and there to support you, our customers, in the best way, conscious that you are our best richness.
Thank you very much.
LTO AUDIO TEAM
2
TABLE OF CONTENTS
1.INTRODUCTION ........................................................................................................................... 4
2.FEATURE LIST ..............................................................................................................................4
3.CONTROL ELEMENTS ................................................................................................................. 4
3.1 Mono 4-Way Operation
a. The Front Panel
b. The Rear Panel
3.2 Stereo 3-Way Operation
a. The Front Panel
b. The Rear Panel
3.3 Stereo 2-Way Operation
a. The Front Panel
b. The Rear Panel
4.INSTALLATION & CONNECTION ............................................................................................... 10
4.1 Mains Connection
4.2 Audio Connection
4.3 Rack Mounting
5.APPLICATION .............................................................................................................................. 11
5.1 X-P234 Used in 4-way mono operation mode
5.2 X-P234 Used in 3-way stereo operation mode
5.3 X-P234 Used in 2-way stereo operation mode
6.TECHNICAL SPECIFICATIONS ................................................................................................. 14
7.WARRANTY ............................................................................................................................... 16
3
1. INTRODUCTION
Thank you very much for expressing your confidence in LTO products by purchasing our X-P234 Active Crossover.
The LTO X-P234 Active Crossover is an ideal crossover solution for most small and large PA systems, live sound
venues, commercial installations, recording studio monitors and DJ setups. In addition to its flexibility in configuring
to different sound systems, the X-P234 Active Crossover has advanced features such as CD Horn Equalization for
constant directivity horn compensation, Phase Switches for instant phase correction and Mute Switches per frequency
band.
The X-P234 Active Crossover is a single rack unit, dual channels electronic crossover capable of managing the frequency control for stereo 2-way/3-way and mono 4-way speaker systems.
2. FEATURE LIST
Single rack unit (1U)
Professional high-precision stereo 2-way/3-way/mono 4-way crossover
World-class performance 24 dB per octave Linkwitz-Riley filters
Absolutely flat summed amplitude response, zero phase difference
Individual output level controls for all bands
Individual limiter on each output for optimal loudspeaker protection
Individual output mutes for easy band adjustment
Individual phase reverse switches for instant phase correction
Switchable 25 Hz subsonic filter on each input for low-frequency driver protection
"Low Sum "function provides low-level mono output for subwoofer operation
Adjustable time delay for phase alignment between drivers
CD horn equalization for constant directivity horn compensation
Servo-balanced, gold-plated XLR connectors for all inputs and outputs
Ultra high-precision potentiometers for ultimate accuracy and repeatability
High-quality components and exceptionally rugged construction for long life and reliability
Shielded toroidal mains transformer for minimal noise interference
3. CONTROL ELEMENTS
LOW SUM
LOW SUM
MONO
4-WAY
MODE
MONO
4-WAY
NOT
VALID
NORMAL
SUMMED
STEREO
3-WAY
STEREO
2-WAY
LF SUM
The X-P234 Active Crossover can be operated in three modes: 4-way mono / 3-way stereo and 2-way stereo, please
activate each operation mode by means of the two Mode Buttons on the rear panel:
Operation Mode
3.1 Mono 4-way operation
3.2 Stereo 3-way operation
Mode Button status
Left Button
Right Button
Out
Pressed
Out
Out
3.3 Stereo 2-way operation
Pressed
Out
Since you selected the direct operation mode, the Stereo LED on the front panel lights up to indicate the stereo
operation in 3.2 & 3.3, and Mono LED lights up to indicate the mono operation in 3.1. The functions of most of these
controls are different in each mode selection, detail you can refer to the panel description.
3.1 Mono 4-Way Operation
a. The Front Panel
4
32
7
LOW CUT
LOW/MID HIGH
MID/HIGH
LOW DELAY
LOW OUTPUT
MID OUTPUT
INPUT
LOW CUT
LOW/LOW-MID
LOW-MID/HIGH-MID
LOW DELAY
LOW OUTPUT
LOW-MID OUTPUT
0
CHANNEL 1
200
2K
2K
1
0
MONO
4
4
12
12
120
1K2
R
LTO
10
INPUT
8
8
OFF
LIM
60
600
ON
dB
350
3K5
1K2
700
7K
3K5
1.3 2
0.7
LIM
2
9K3
4
4
0
2
6
6
Hz
Hz
mSec.
dB
XOVER FREQ.
XOVER FREQ.
DELAY
GAIN
OFF
ON
2
2
INV
4
4
6
6
OFF
CHANNEL 2
4
4
6
6
OFF
OFF
ON
ON
12
12
LOW CUT
1 2
120
1K2
MUTE
CD HORN
dB
dB
8
8
OFF
60
600
ON
dB
25Hz
INPUT
LOW OUTPUT
350
3K5
1K2
700
7K
HIGH OUTPUT
HIGH OUTPUT
3K5
1.3 2
0.7
2
2
9K3
4
4
0
2
6
6
Hz
Hz
mSec.
dB
XOVER FREQ.
XOVER FREQ.
DELAY
GAIN
OFF
STEREO 3-WAY 2-WAY
MONO 4-WAY
LIM
0
MULTIBAND LIMITER
9
0
2
2
2
INV
7K
600
930 440
9K3
44
440
LIM
0
1
2K
28
MID OUTPUT
HIGH-MID OUTPUT
LIM
200
2K
INV
4
4
ON
LOW DELAY
STEREO
0
0
2
MID/HIGH
HIGH-MID/HIGH
LIM
0
2
LOW/MID HIGH
LOW CUT
MONO 4-WAY
INV
7K
600
930 440
9K3
44
440
25
INPUT
STEREO 2 3-WAY
HIGH OUTPUT
INV
4
4
ON
6
6
OFF
ON
6
12
6
OFF
X-P234
INV
4
4
6
6
OFF
ON
dB
dB
2-WAY/3-WAY STEREO
18
0
ON
OFF
ON
4-WAY MONO
ACTIVE CROSSOVER
OFF
dB
25Hz
3
4
5
MUTE
6 8
GAIN
MUTE
9 11
GAIN
INPUT
LOW CUT
15
MUTE
19
GAIN
MUTE
GAIN
MUTE
THRESHOLD LIMITER
POWER
24 26 27 29 30 31
1.Input Level Control
This knob is used to adjust the input level, which can be varied from -12dB to +12dB.
2.Low Cut
Engage this button to add a 25Hz low cut filter into the input signal path.
3. Low/Low-Mid XOVER FREQ.
This knob adjusts the Low/Low-Mid crossover frequency from 44Hz to 930Hz, based on which, the Low/Low-Mid
frequencies can be output separately.
4.Low-Mid/High-Mid XOVER FREQ.
This knob adjusts the Low-Mid/High-Mid crossover frequency from 440Hz to 9.3KHz, based on which, the LowMid/High-Mid frequencies can be output separately.
5.Delay Control
This knob adjusts the delay time from 0 to 2ms for the low frequencies output, which is proved to be a useful
function in the PA applications, esp. in the large size concert environment.
6.Low Output Gain Control
This control is used to attenuate or boost the low frequencies output by 6dB.
7.Phase Inversion for Low Output
This button will reverse the phase of the low frequencies output by 180 , so that, the low frequencies cancellation
in some fields can be compensated for.
8.Mute for Low Output
This button mutes the low frequencies output.
9.Low-Mid Output Gain Control
This control is used to attenuate or boost the low-middle frequencies output by 6dB.
10.Phase Inversion for Low-Mid Output
This button will reverse the phase of the low-middle frequencies output by 180 , so that, the low-middle frequencies
cancellation in some fields can be compensated for.
11.Mute for Low-Mid Output
This button mutes the low-middle frequencies' output.
15.CD Horn
Abbreviation for 'Constant Directivity Horn', this button can be used to boost the high frequencies, so that the
power loss of it during the long distance transmission can be compensated for.
19.High-Mid/High XOVER FREQ.
This knob adjusts the High-Mid/High crossover frequency from 440Hz to 9.3KHz, based on which, the High-Mid/
High frequencies can be output separately.
24.High-Mid Output Gain Control
This control is used to attenuate or boost the high-middle frequencies output by 6dB.
25.Phase Inversion for High-Mid Output
This button will reverse the phase of the high-middle frequencies output by 180 , so that, the high-middle frequencies cancellation in some fields can be compensated for.
26.Mute for High-Mid Output
This button mutes the high-middle frequencies output.
27.High Output Gain Control
This control is used to attenuate or boost the high frequencies output by 6dB.
5
28.Phase Inversion for High Output
This button will reverse the phase of the high frequencies output by 180 , so that, the high frequencies
cancellation in some fields can be compensated for.
29.Mute for High Output
This button mutes the high frequencies output.
30.Threshold Setting
To prevent any damage to your speakers effectively, set the threshold of the multi-band limiter at the proper
position.
31.Limiter Control
Engage this button to activate each band's limiter.
32.Mono Mode Indicator
This LED lights up when the operation is selected in Mono mode.
b. The Rear Panel
STEREO 2-WAY
NOT USED
MID
HIGH
HIGH
110-120V
AC INPUT
LOW
LOW
INPUT
INPUT
LOW/HIGH
LOW/MID
MONO
4-WAY
XOVER FREQ.
FUSE:
1
10
210-240V: T250mAL 250VAC
95-120V: 500mA 250VAC
REPLACE FUSE WITH CORRECT
TYPE ONLY
NEW
NOT
VALID
TIDE
NOT USED
MID
HIGH
HIGH
LOW/LF SUM
LOW/LF SUM
LOW/HIGH
LOW/MID
1
10
SUMMED
1
INPUT
INPUT
XOVER FREQ.
NORMAL
3
2
NEW
TIDE
3
2
1
STEREO
3-WAY
Apparaten skall anslutas till
jordat uttag nar den ansluts
till ett natverk
A101
LOW SUM
LOW SUM
MONO
4-WAY
MODE
95-120V /210-240V 60-50Hz
Rated Power Consumption 17W
220-240V
NOT USED
HIGH-MID
HIGH
MONO 4-WAY
3
NOT USED
STEREO
2-WAY
NOT USED
4
LF SUM
NOT USED
LOW-MID
8
LOW
11
LOW/LOW-MID
12
13
INPUT
14
3.High Output Connector
This XLR balanced connector is used to output the high frequencies signal.
4.High-Mid Output Connector
This XLR balanced connector is used to output the high-middle frequencies signal.
8.Operation Mode Button
Release the left button, and press the right button to enter into the mono 4-way operation mode.
11.Low-Mid Output Connectors
This XLR balanced connector is used to output the low-middle frequencies signal.
12.Low Output Connector
This XLR balanced connector is used to output the low frequencies signal.
13.Low/Low-Mid XOVER FREQ Multiplier
Combined with the usage of the Low/Low-Mid XOVER FREQ. (3) knob on the front panel, this button can switch
the crossover frequency range to 440Hz to 9.3kHz.
Please ensure that, your speaker management system must be powered off before you proceed this switching,
otherwise, the offensive switching noise can be heard through your speakers.
14.Input Connector
This balanced XLR connector is used to input the mono program sources.
3.2 Stereo 3-Way Operation
a. The Front Panel
7
LOW CUT
LOW/MID HIGH
MID/HIGH
LOW DELAY
LOW OUTPUT
MID OUTPUT
INPUT
LOW CUT
LOW/LOW-MID
LOW-MID/HIGH-MID
LOW DELAY
LOW OUTPUT
LOW-MID OUTPUT
0
CHANNEL 1
MONO
4
4
12
12
120
1K2
R
LTO
10
INPUT
8
8
OFF
LIM
200
2K
60
600
ON
dB
350
3K5
1K2
700
7K
2K
1.3 2
0.7
9K3
4
4
0
2
6
6
Hz
Hz
mSec.
dB
LOW CUT
XOVER FREQ.
XOVER FREQ.
DELAY
GAIN
2
3
OFF
ON
6
OFF
ON
4
4
6
6
OFF
OFF
ON
ON
12
12
1
120
1K2
MUTE
CD HORN
8
8
OFF
60
600
ON
dB
dB
dB
LOW DELAY
LOW OUTPUT
MID OUTPUT
350
3K5
1K2
700
7K
2K
1.3 2
0.7
2
9K3
4
4
0
2
6
6
Hz
Hz
mSec.
dB
XOVER FREQ.
XOVER FREQ.
DELAY
GAIN
OFF
ON
MULTIBAND LIMITER
9
0
2
2
INV
7K
600
MONO 4-WAY
LIM
0
2
STEREO 3-WAY 2-WAY
HIGH OUTPUT
LIM
0
1
3K5
930 440
9K3
44
440
HIGH OUTPUT
HIGH-MID OUTPUT
LIM
200
2K
INV
4
4
25Hz
INPUT
MID/HIGH
HIGH-MID/HIGH
2
INV
4
4
6
0
LOW/MID HIGH
STEREO
2
INV
7K
600
930 440
9K3
44
440
LOW CUT
CHANNEL 2
0
2
2
INPUT
LIM
0
2
33
STEREO 2 3-WAY
MONO 4-WAY
LIM
0
1
3K5
13
HIGH OUTPUT
2
INV
4
4
6
6
OFF
ON
12
6
OFF
X-P234
INV
4
4
6
6
OFF
ON
2-WAY/3-WAY STEREO
18
0
ON
OFF
ON
OFF
dB
dB
dB
6
25Hz
4
5
MUTE
6 8
GAIN
MUTE
GAIN
INPUT
LOW CUT
MUTE
GAIN
MUTE
GAIN
MUTE
THRESHOLD LIMITER
30 31
9 11 12 14 15
1.Input Level Control
This knob is used to adjust the input level, which can be varied from -12dB to +12dB.
6
POWER
4-WAY MONO
ACTIVE CROSSOVER
2.Low Cut
Engage this button to add a 25Hz low cut filter into the input signal path.
3.Low/Mid XOVER FREQ. Control
This knob adjusts the Low/Mid crossover frequency from 44Hz to 930Hz, based on which, the Low/Mid
frequencies can be output separately.
4.Mid/High XOVER FREQ.
This knob adjusts the Mid/High crossover frequency from 440Hz to 9.3kHz, based on which, the Mid/ High
frequencies can be output separately.
5.Delay Control
This knob adjusts the delay time from 0 to 2ms for the low frequencies output, which is proved to be a useful
function in the PA applications, esp. in the large size concert environment.
6.Low Output Gain Control
This control is used to attenuate or boost the low frequencies output by 6dB.
7.Phase Inversion for Low Output
This button will reverse the phase of the low frequencies output by 180 , so that, the low frequencies cancellation
in some fields can be compensated for.
8.Mute for Low Output
This button mutes the low frequencies output.
9.Mid Output Gain Control
This control is used to attenuate or boost the middle frequencies output by 6dB.
10.Phase Inversion for Mid Output
This button will reverse the phase of the middle frequencies output by 180 , so that, the middle frequencies
cancellation in some fields can be compensated for.
11.Mute for Mid Output
This button mutes the middle frequencies' output.
12.High Output Gain Control
This control is used to attenuate or boost the high frequencies output by 6dB.
13.Phase Inversion for High Output
This button will reverse the phase of the high frequencies output by 180 , so that, the high frequencies cancellation in some fields can be compensated for.
14.Mute for High Output
This button mutes the high frequencies output.
15.CD Horn
Abbreviation for 'Constant Directivity Horn', this button can be used to boost the high frequencies, so that the
power loss of it during the long distance transmission can be compensated for.
30.Threshold Setting
To prevent any damage to your speakers effectively, set the threshold of the multi-band limiter at the proper
position.
31.Limiter Control
Engage this button to activate each band's limiter.
33.Stereo Mode Indicator
This LED lights up when the operation is selected in stereo mode.
b. The Rear Panel
STEREO 2-WAY
110-120V
220-240V
NOT USED
MID
HIGH
HIGH
AC INPUT
LOW
LOW
MODE
MONO
4-WAY
XOVER FREQ.
FUSE:
1
10
210-240V: T250mAL 250VAC
95-120V: 500mA 250VAC
REPLACE FUSE WITH CORRECT
TYPE ONLY
A101
INPUT
INPUT
LOW/HIGH
LOW/MID
95-120V /210-240V 60-50Hz
Rated Power Consumption 17W
Apparaten skall anslutas till
jordat uttag nar den ansluts
till ett natverk
MONO 4-WAY
NEW
TIDE
NOT
VALID
3
2
LOW SUM
LOW SUM
MONO
4-WAY
HIGH
HIGH
NOT USED
MID
LOW/LF SUM
LOW/LF SUM
1
10
SUMMED
1
LOW/HIGH
LOW/MID
INPUT
INPUT
XOVER FREQ.
NORMAL
NEW
TIDE
3
2
1
STEREO
3-WAY
NOT USED
HIGH-MID
HIGH
3
4
NOT USED
5
NOT USED
6
STEREO
2-WAY
8
7
LF SUM
9
NOT USED
10
LOW-MID
11
LOW
12
LOW/LOW-MID
13
INPUT
14
3.High Output Connectors (3 and 10)
These two XLR balanced connectors are used to output the high frequencies signal.
4.Mid Output Connectors (4 and 11)
These two XLR balanced connectors are used to output the middle frequencies signal.
5.Low/LF SUM output connectors (5 and 12)
These two XLR balanced connectors are used to output the low frequencies signal.
6.Low/Mid XOVER FREQ. Multiplier (6 and 13)
Combined with the usage of the Low/Mid XOVER FREQ. (3) knob on the front panel, this button can switch
the crossover frequency range to 440Hz to 9.3kHz.
Please ensure that, your speaker management system must be powered off before you proceed this switching,
otherwise, the offensive switching noise can be heard through your speakers.
8.Operation Mode Option
Release both buttons to enter into the stereo 3-way operation mode.
9.Low Sum Control
Press this button to sum up the low frequencies output of Channel1 and Channel2, and the summed signal
can be output from Channel1.
14.Input Connector
These two balanced XLR connectors are used to input the program sources.
3.3 Stereo 2-Way Operation
a. The Front Panel
7
INPUT
LOW CUT
LOW/MID HIGH
MID/HIGH
LOW DELAY
LOW OUTPUT
INPUT
LOW CUT
LOW/LOW-MID
LOW-MID/HIGH-MID
LOW DELAY
LOW OUTPUT
0
CHANNEL 1
200
2K
2K
1
0
MONO
4
4
12
12
8
8
OFF
60
600
ON
dB
350
3K5
1K2
700
7K
3K5
1.3 2
0.7
9K3
4
4
0
2
6
6
Hz
Hz
mSec.
dB
XOVER FREQ.
XOVER FREQ.
DELAY
GAIN
OFF
ON
2
2
6
6
0
CHANNEL 2
OFF
ON
2
dB
6
6
LOW CUT
1 2
LOW DELAY
LOW OUTPUT
1
0
OFF
OFF
ON
ON
MUTE
CD HORN
MID OUTPUT
4
4
12
12
120
1K2
8
8
dB
OFF
60
600
ON
dB
350
3K5
1K2
700
7K
2K
3K5
1.3 2
0.7
2
2
9K3
4
4
0
2
6
6
Hz
Hz
mSec.
dB
XOVER FREQ.
XOVER FREQ.
DELAY
GAIN
OFF
ON
STEREO 3-WAY 2-WAY
HIGH OUTPUT
LIM
MONO 4-WAY
LIM
0
MULTIBAND LIMITER
9
0
2
2
INV
7K
600
930 440
9K3
44
440
HIGH OUTPUT
HIGH-MID OUTPUT
LIM
200
2K
INV
4
4
MID/HIGH
HIGH-MID/HIGH
25Hz
INPUT
LOW/MID HIGH
STEREO
INV
4
4
LOW CUT
LIM
0
INV
7K
600
930 440
9K3
44
440
2
INPUT
MONO 4-WAY
LIM
0
2
34
STEREO 2 3-WAY
HIGH OUTPUT
LOW-MID OUTPUT
LIM
120
1K2
R
LTO
13
MID OUTPUT
2
INV
4
4
OFF
ON
6
6
dB
6
12
6
OFF
X-P234
INV
4
4
6
6
OFF
ON
dB
2-WAY/3-WAY STEREO
18
0
ON
OFF
ON
4-WAY MONO
ACTIVE CROSSOVER
OFF
dB
25Hz
3
5
MUTE
6 8
GAIN
MUTE
GAIN
INPUT
LOW CUT
MUTE
GAIN
MUTE
GAIN
MUTE
THRESHOLD LIMITER
30 31
12 14 15
POWER
35
1.Input Control
This knob is used to adjust the input level, which can be varied from -12dB to +12dB.
2.Low Cut
Engage this button to add a 25Hz low cut filter into the input signal path.
3.Low/High XOVER FREQ.
This knob adjusts the Low/High crossover frequency from 44Hz to 930Hz, based on which, the Low/High
frequencies can be output separately.
5.Delay Control
This knob adjusts the delay time from 0 to 2ms for the low frequencies output, which is proved to be a useful
function in the PA applications, esp. in the large size concert environment.
6.Low Output Gain Control
This control is used to attenuate or boost the low frequencies output by 6dB.
7.Phase Inversion for Low Output
This button will reverse the phase of the low frequencies output by 180 , so that, the low frequencies cancellation in some fields can be compensated for.
8.Mute for Low Output
This button mutes the low frequencies output.
12.High Output Gain Control
This control is used to attenuate or boost the high frequencies output by 6dB.
13.Phase Inversion for High Output
This button will reverse the phase of the high frequencies output by 180 , so that, the high frequencies cancellation in some fields can be compensated for.
8
14.Mute for High Output
This button mutes the high frequencies output.
15.CD Horn
Abbreviation for 'Constant Directivity Horn', this button can be used to boost the high frequencies, so that the
power loss of it during the long distance transmission can be compensated for.
30.Threshold Setting
To prevent any damage to your speakers effectively, set the threshold of the multi-band limiter at the proper
position.
31.Limiter Control
Engage this button to activate the limiter.
34.LIM indicator
This LED lights up when the limiter of the band is activated.
35.Power Switch
Turns the power on or off.
b. The Rear Panel
STEREO 2-WAY
HIGH
HIGH
110-120V
AC INPUT
NOT USED
MID
LOW
LOW
MODE
MONO
4-WAY
XOVER FREQ.
FUSE:
1
10
210-240V: T250mAL 250VAC
95-120V: 500mA 250VAC
REPLACE FUSE WITH CORRECT
TYPE ONLY
Apparaten skall anslutas till
jordat uttag nar den ansluts
till ett natverk
A101
MONO 4-WAY
1
INPUT
INPUT
LOW/HIGH
LOW/MID
95-120V /210-240V 60-50Hz
Rated Power Consumption 17W
220-240V
2
NEW
TIDE
NOT
VALID
3
2
LOW SUM
LOW SUM
MONO
4-WAY
NOT USED
MID
HIGH
HIGH
LOW/LF SUM
LOW/LF SUM
1
10
SUMMED
1
LOW/HIGH
LOW/MID
INPUT
INPUT
XOVER FREQ.
NORMAL
NEW
TIDE
3
2
1
STEREO
3-WAY
HIGH
NOT USED
HIGH-MID
3
5
NOT USED
NOT USED
6
STEREO
2-WAY
LF SUM
NOT USED
8
9
10
LOW
LOW/LOW-MID
INPUT
12
13
14
LOW-MID
2.Fuse Holder/Voltage Selector
Your unit may have the AC voltage selector (~115V/60Hz or ~230 V/50Hz) built into the Fuse Holder. To change,
pull fuse-holder out and rotate 180 , then push in again.
Caution: the fuse protecting the AC supplies circuits of this unit. The fuse can only be changed by a qualified
technician, in the event of a fault or changing the supply voltage. If the fuse continues to blow after replacing,
discontinue use of this before repaired.
220-240V
110-120V
220-240V
110-120V
THIS IS SET FOR
110V AC TO 120V
AC OPERATION
THIS IS SET FOR
220V AC TO 240V
AC OPERATION
The fuse-holder above the AC connector on the rear of the chassis has 3 triangular markers (please refer to the
above pictures), with two of these triangles opposing each other, your unit is set to the operating Voltage printed
next to these markers.
3.High Output Connectors (3 and 10)
These two XLR balanced connectors are used to output the high frequencies signal.
5.Low/LF SUM output connectors (5 and 12)
These two XLR balanced connectors are used to output the low frequencies signal.
9
6.Low/High XOVER FREQ. Multiplier
Combined with the usage of the Low/High XOVER FREQ. (3) knob on the front panel, this button can switch
the crossover frequency range to 440Hz to 9.3kHz.
Please ensure that, your speaker management system must be powered off before you proceed this switching,
otherwise, the offensive switching noise can be heard through your speakers.
8.Operation Mode Option
Press the left button, and release the right button to enter into the stereo 2-way operation mode.
9.Low Sum Control
Press this button to sum up the low frequencies output of Channel1 and Channel2, and the summed signal
can be output from Channel1.
14.Input Connector
These two balanced XLR connectors are used to input the stereo program sources.
4. INSTALLATION & CONNECTION
4.1 Mains Connection
Please ensure that the LTO X-P234 Active Crossover is set to the correct supply voltage before plugging the
power cord into the wall outlet , use the same fuse as marked on the fuse holder at the AC power connection socket.
The mains connection of the LTO X-P234 Active Crossover is made by using the enclosed mains cable and a
standard IEC receptacle. It meets all of the international safety certification requirements.
4.2 Audio Connection
The LTO X-P234 Active Crossover presents with balanced XLR connectors, and it can be interfaced by several
ways to support a variety of applications without any signal loss.
a. Wiring Configuration
Either the 1/4" TRS (Tip-Ring-Sleeve) jack or the XLR servo connector can be wired in balanced and unbalanced
modes. Please wire your systems as the following examples:
For 1/4" Phone jack
+
+
-
Tip
+
Tip
Ring
Tip
Ring
Sleeve
Sleeve
TS Type Unbalanced
Sleeve
TRS Type Balanced
TRS Type Unbalanced
For XLR connector
Pin2 (+)
Pin3 (-)
(Linked to Pin1 manually,
Pin2 (+)
Pin3 (-)
)
Pin1 ( )
Pin1 ( )
XLR Type Unbalanced
XLR Type Balanced
10
b. In Line Connection
For these applications, the X-P234 Active Crossover provides XLR connectors to easily interface with most professional audio devices. Follow the configuration examples below for your particular connection.
Balanced
1
2
3
Tip
Ring
1
2
3
3
3
1
1
1
2
3
2
2
1
3
2
TIP RING SLEEVE
Sleeve
Unbalanced
1
Tip
Ring
3
2
1
2
3
Sleeve
TIP RING SLEEVE
Tip
1
1
2
3
3
2
Sleeve
2
3
1
TIP SLEEVE
3
3
1
1
2
2
1
2
3
Cent r e
1
2
1
2
3
Screen
3
4.3 Rack Mounting
The most secure mounting is on a universal rack shelf available from various rack manufactures or your music
dealer. The X-P234 Active Crossover fits into one standard 19" rack unit of space. Please allow at least an additional
4" depth for the connectors on the rear panel. Be sure that there is enough air space around the unit for sufficient
ventilation and please do not place the X-P234 Active Crossover on high temperature devices such as power
amplifiers etc. to avoid overheating.
5. APPLICATION
The X-P234 active crossover is truly a versatile speaker management system, according to its operation mode option,
you can connect it in your system in three ways:
5.1 X-P234 Used in 4-way mono operation mode
High
Low-Mid
Mid-High
Main Outputs
STEREO 2-WAY
STEREO 3-WAY
110-120V
AC INPUT
HIGH
HIGH
NOT USED
MID
LOW
LOW
INPUT
INPUT
LOW/HIGH
LOW/MID
MODE
MONO
4-WAY
220-240V
Rated Power Consumption 17W
XOVER FREQ.
FUSE:
1
10
210-240V: T250mAL 250VAC
95-120V: 500mA 250VAC
REPLACE FUSE WITH CORRECT
TYPE ONLY
Apparaten skall anslutas till
Jordat uttag nar den ansluts
Till ett natverk
MONO 4-WAY
NEW
TIDE
NOT
VALID
3
2
LOW SUM
LOW SUM
MONO
4-WAY
HIGH
HIGH
NOT USED
MID
LOW/LF SUM
LOW/LF SUM
LOW/HIGH
LOW/MID
INPUT
INPUT
XOVER FREQ.
NORMAL
1
10
SUMMED
1
NEW
TIDE
3
2
1
STEREO
3-WAY
HIGH
HIGH-MID
NOT USED
NOT USED
NOT USED
STEREO
2-WAY
LF SUM
NOT USED
LOW-MID
LOW
LOW/LOW-MID
INPUT
Low
11
To get such a typical application, configure your system and connect the wires in the following proper steps:
1. Release the left button, and press the right button to enter into the mono 4-way operation mode.
2. Apply the mono program sources from the Mixer to the Input Connector of Channel1.
3. Output the Low frequencies signal to the power amplifier.
4. Output the Low-Mid frequencies signal to the power amplifier.
4. Output the High-Mid frequencies signal to the power amplifier.
5. Output the High frequencies signal to the power amplifier.
6. Power up the X-P234 first, then the power amplifier to run the system. While powered off, please ensure the
power amplifier is turned off first, then the X-P234.
5.2 X-P234 Used in 3-way stereo operation mode
R
STEREO 2-WAY
STEREO 3-WAY
HIGH
HIGH
110-120V
AC INPUT
NOT USED
MID
LOW
LOW
LOW SUM
LOW SUM
MONO
4-WAY
MODE
XOVER FREQ.
FUSE:
1
10
210-240V: T250mAL 250VAC
95-120V: 500mA 250VAC
REPLACE FUSE WITH CORRECT
TYPE ONLY
NEW
TIDE
NOT
VALID
HIGH
HIGH
NOT USED
MID
LOW/LF SUM
LOW/LF SUM
1
10
SUMMED
1
LOW/HIGH
LOW/MID
INPUT
INPUT
XOVER FREQ.
NORMAL
3
2
NEW
TIDE
3
2
1
STEREO
3-WAY
Apparaten skall anslutas till
jordat uttag nar den ansluts
till ett natverk
A101
INPUT
INPUT
LOW/HIGH
LOW/MID
MONO
4-WAY
95-120V /210-240V 60-50Hz
Rated Power Consumption 17W
220-240V
L
Main Outputs
HIGH
MONO 4-WAY
NOT USED
HIGH-MID
NOT USED
NOT USED
STEREO
2-WAY
LF SUM
NOT USED
LOW-MID
LOW
LOW/LOW-MID
INPUT
High
High
Mid
Mid
Low
Low
To get such a typical application, configure your system and connect the wires in the following proper steps:
1. Release both buttons to enter into the stereo 3-way operation mode.
2. Apply the stereo program sources from the Mixer to the Input Connectors of Channel1 and Channel2.
3. Output the Low frequencies signal to the power amplifier.
4. Output the Mid frequencies signal to the power amplifier.
5. Output the High frequencies signal to the power amplifier.
6. Power up the X-P234 first, then the power amplifier to run the system. While powered off, please ensure the
power amplifier is turned off first, then the X-P234.
5.3 X-P234 Used in 2-way stereo operation mode
Main Outputs
R
STEREO 2-WAY
STEREO 3-WAY
110-120V
AC INPUT
220-240V
HIGH
HIGH
NOT USED
MID
LOW
LOW
Apparaten skall anslutas till
jordat uttag nar den ansluts
till ett natverk
MONO 4-WAY
INPUT
INPUT
MODE
XOVER FREQ.
1
10
210-240V: T250mAL 250VAC
95-120V: 500mA 250VAC
REPLACE FUSE WITH CORRECT
TYPE ONLY
A101
LOW/HIGH
LOW/MID
MONO
4-WAY
95-120V /210-240V 60-50Hz
Rated Power Consumption 17W
FUSE:
NEW
TIDE
NOT
VALID
3
2
L
LOW SUM
LOW SUM
MONO
4-WAY
HIGH
HIGH
NOT USED
MID
LOW/LF SUM
LOW/LF SUM
LOW/HIGH
LOW/MID
INPUT
INPUT
XOVER FREQ.
NORMAL
1
10
SUMMED
1
NEW
TIDE
3
2
1
STEREO
3-WAY
HIGH
HIGH-MID
NOT USED
NOT USED
NOT USED
STEREO
2-WAY
LF SUM
NOT USED
LOW-MID
High
LOW
LOW/LOW-MID
INPUT
High
Low
Low
12
To get such a typical application, configure your system and connect the wires in the following proper steps:
1. Press the left button, and release the right button to enter into the stereo 2-way operation mode.
2. Apply the stereo program sources from the Mixer to the Input Connectors of Channel1 and Channel2.
3. Output the Low frequencies signal to the power amplifier.
4. Output the High frequencies signal to the power amplifier.
5. Power up the X-P234 first, then the power amplifier to run the system. While powered off, please ensure the
power amplifier is turned off first, then the X-P234.
13
6. TECHNICAL SPECIFICATIONS
INPUT
Connectors
Type
Impedance
Max. Input Level
CMRR
XLR
Electronically servo-balanced, RF filtered
Balanced >50K Ohms, unbalanced >25K Ohms
+22dBu typical, balanced or unbalanced
>40dB, typically > 55 dB at 1 KHz
Connectors
Type
Impedance
Max. Output Level
XLR
Electronically servo-balanced, RF filtered
Balanced 60 Ohms, unbalanced 30 Ohms
+20dBu balanced or unbalanced
Bandwidth
Frequency Response
Signal to Noise
20Hz to 20KHz, +0/-0.5dB
<5Hz to>90KHz, +0/-3dB
Ref: +4dBu, 20Hz to20KHz,unweighted
Stereo Mode:
Mono Mode:
>93dBu
>93dBu
>94dBu
>95dBu
>94dBu
>90dBu
>88dBu
>106dB,unweighted
Limiter Off
Limiter On
<0.04%
<0.5 %
High to Low:
<93dBu
High to Mid:
<94dBu
Mid to Low:
<95dBu
High to High-Mid:
<95dBu
High-Mid to Low-Mid:
<95dBu
Low-Mid to Low:
<92dBu
OUTPUT
PERFORMANCE
Low Output
Low-Mid Output
Mid Output
High-Mid Output
High Output
Dynamic Range
THD & Noise
Interchannel Crosstalk
CROSSOVER
Filter Type
Stereo Mode Frequencies
Low/High
Low/Mid
Mid /High
Mono Mode Frequencies
Low/Low-Mid
Low-Mid/High-Mid
High-Mid/High
Linkwitz-Riley, 24dB/Octave, state-variable
1
10
44Hz to 930Hz
440Hz to 9.3KHz
44Hz to 930Hz
440Hz to 9.3KHz
440Hz to 9.3KHz
1
10
44Hz to 930Hz
440Hz to 9.3KHz
440Hz to 9.3KHz
440Hz to 9.3KHz
Front Panel
Low Cut
Mute
Phase Invert
CD Horn
Limiter
Activates 25 Hz Butterworth, 12 dB/Octave high-pass filter
Mutes the individual output
Inverts the phase at the individual output
Corrects CD horn frequency response above 3.5KHz
Activates the limiter function for all outputs
FUNCTION SWITCHES
14
Rear Panel
Xover Frequency
Mode
LF Sum
Mutiplies crossover frequency range by 10
Selects stereo /mono and 2/3/4-way operation
Selects normal stereo or mono-summed low frequency operation
ON=Channel1+6dB Louder Channal2: the same as before
CONTROLS
Input
Xover Frequency
Delay
Gain
Threshold
Controls the input gain(+/-12dB)
Controls the crossover frequency
Controls the delay at the low output(0 to 2 msec.)
Controls the output gain(+/-6dB)
Controls the threshold of the limiter (-6dB to OFF)
Connector type
Type
Mains supply
Power Rating
Fuse
3-pole IEC, grounded
serve controlled, stabilized
95-120V /210-240V ,60-50Hz
<17W
210-240V: T250mAL 250VAC
95-120V: 500mA 250VAC
Dimensions
Net Weight
483(W)
194.5(D)
3.3Kg(7.27lb)
POWER SUPPLY
PHYSICAL
15
44(H)mm(19"
7.7"
1.7")
7. WARRANTY
1. WARRANTY REGISTRATION CARD
To obtain Warranty Service, the buyer should first fill out and return the enclosed Warranty Registration Card within
10 days of the Purchase Date.
All the information presented in this Warranty Registration Card gives the manufacturer a better understanding of
the sales status, so as to purport a more effective and efficient after-sales warranty service.
Please fill out all the information carefully and genuinely, miswriting or absence of this card will void your warranty
service.
2. RETURN NOTICE
2.1 In case of return for any warranty service, please make sure that the product is well packed in its original shipping
carton, and it can protect your unit from any other extra damage.
2.2 Please provide a copy of your sales receipt or other proof of purchase with the returned machine, and give detail
information about your return address and contact telephone number.
2.3 A brief description of the defect will be appreciated.
2.4 Please prepay all the costs involved in the return shipping, handling and insurance.
3. TERMS AND CONDITIONS
3.1
LTO warrants that this product will be free from any defects in materials and/or workmanship for a period
of 1 year from the purchase date if you have completed the Warranty Registration Card in time.
3.2 The warranty service is only available to the original consumer, who purchased this product directly from the
retail dealer, and it can not be transferred.
3.3 During the warranty service, LTO may repair or replace this product at its own option at no charge to you for
parts or for labor in accordance with the right side of this limited warranty.
3.4 This warranty does not apply to the damages to this product that occurred as the following conditions:
Instead of operating in accordance with the user's manual thoroughly, any abuse or misuse of this product.
Normal tear and wear.
The product has been altered or modified in any way.
Damage which may have been caused either directly or indirectly by another product / force / etc
Abnormal service or repairing by anyone other than the qualified personnel or technician.
And in such cases, all the expenses will be charged to the buyer.
3.5 In no event shall LTO be liable for any incidental or consequential damages. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above exclusion or limitation may not apply to you.
3.6 This warranty gives you the specific rights, and these rights are compatible with the state laws, you may also
have other statutory rights that may vary from state to state.
16
SEIKAKU TECHNICAL GROUP LIMITED
No. 1, Lane 17, Sec. 2, Han Shi W. Road, Taichung, 401 Taiwan
http://www.altomobile.com Tel: 886-4-22313737
email: info@altomobile.com Fax: 886-4-22346757
All rights reserved to ALTO Mobile. Due to continued development in response to
customer feedback, product features, specifications and/or internal/external design may be
changed without prior notice. No photocopying, translation or reproduction of any part of this user
manual is allowed without prior written permission.Copyright c 2004 Seikaku Technical Group Limited.
NF00903-1.0