Alto GATE user manual
User's Manual
ALTO GATE
EXPANDER/GATE
R
LTO
www.altoproaudio.com
Version 1.3 September 2005
English
Fuse
SAFETY RELATED SYMBOLS
To prevent fire and damage to the product, use only
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.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
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.
Protective Ground
Before turning the product ON, make sure that it is
connected to Ground. This is to prevent the risk of
electric shock.
This symbol, wherever used, alerts you to important operating and maintenance instructions.
Please read.
Never cut internal or external Ground wires. Likewise,
never remove Ground wiring from the Protective
Ground Terminal.
Protective Ground Terminal
Operating Conditions
AC mains (Alternating Current)
Always install in accordance with the manufacturer's
instructions.
Hazardous Live Terminal
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.
Denotes the product is turned on.
OFF: Denotes the product is turned off.
WARNING
Do not install this product near any direct heat source.
Describes precautions that should be observed to
prevent the possibility of death or injury to the user.
Do not block areas of ventilation. Failure to do so
could result in fire.
CAUTION
Keep product away from naked flames.
Describes precautions that should be observed to
prevent damage to the product.
IMPORTANT SAFETY INSTRUCTIONS
Read these instructions
Disposing of this product should not be
placed in municipal waste and should be
Separate collection.
Follow all instructions
Keep these instructions. Do not discard.
Heed all warnings.
WARNING
Only use attachments/accessories specified by the
manufacturer.
Power Supply
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!
External Connection
Protect the power cord and plug from any physical
stress to avoid risk of electric shock.
If the plug does not fit your AC outlet seek advice from
a qualified electrician.
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.
Do not place heavy objects on the power cord. This
could cause electric shock or fire.
Cleaning
When required, either blow off dust from the product
or use a dry cloth.
Do Not Remove Any Covers
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.
Do not use any solvents such as Benzol or Alcohol.
For safety, keep product clean and free from dust.
Servicing
Covers should be removed by qualified service
personnel only.
No user serviceable parts inside.
Refer all servicing to qualified service personnel only.
Do not perform any servicing other than those instructions contained within the User's Manual.
1
PREFACE
Dear Customer:
Thanks for choosing
researches.
LTO GATE and thanks for choosing one of the results of
LTO AUDIO TEAM job and
For our 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
Centers 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 like to share with you our work and our dreams, paying 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 GATE is the result of many hours of listening and tests involving common people, area experts, musicians and technicians.
The results of this effort is that you can acquire an extremely efficient and universal dynamics processor. It Contains
several new circuits design which make the unit an ultimate dynamic processor: interactive Expander/Gate and super
low distortion VCA (Voltage Controlled Amplifier).
Nothing else to add, but that we would like to thank all the people that made the LTO GATE a reality available to
our customers, and thank our designers and all the LTO staff, people who make possible the realization of products
containing our idea of music and sound and are ready 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. THE CONCEPT BEHIND.........................................................................................................................4
2.1 Some Technical Stuff
2.2 Voltage Controlled Amplifier (VCA)
2.3 Inputs
3. CONTROLS................................................................................................................................................6
3.1 The Front Panel
3.2 The Rear Panel
4. INSTALLATION AND CONNECTION.......................................................................................................8
5.1 Mains Connection
5.2 Audio Connection
5.3 Rack Mounting
5. TECHNICAL SPECIFICATIONS .................................................................................................................................11
6. BLOCK DIAGRAM .....................................................................................................................................................12
7. WARRANTY ...............................................................................................................................................................13
3
1. INTRODUCTION
You are now the owner of an LTO GATE. Your LTO GATE is based on many years of experience and is designed
to eliminate noise in systems, hiss and hum in amplifiers, surrounding noise and so on. For more information, please
read this manual carefully.
Feature List:
Mountable in one standard 19" rack unit
Illuminated power switch
Manually adjustable HOLD and RELEASE time
Indicating gain attenuation with 8-segment LED
Range control for gate mode while ratio for expander mode
Balanced XLR and 1/4" TRS connectors for inputs and outputs
Side-chain Filter
The adjustable parametric side-chain filter allows the user to select and eliminate certain frequencies that may
result in unwanted triggering of the gate and expander.
The EXPANDER/GATE Section
You can select freely the EXPANDER/GATE mode in your unit. The two modes can reduce or cut-off the level
of audio signal below a certain set threshold to avoid unexpected noise.
Super quality parts and rigid configuration for long life and full credibility
2. THE CONCEPT BEHIND
2.1 Some Technical Stuff
Good old analog technology: It will allow us to manufacture audio equipment with a very high dynamic range: up
to 125 dB. But the dynamic range of digital equipment is more or less 25 dB less. A further reduction in dynamic
range occurs with the use of tape recorders and/or vinyl records.
2.1.1 It is not just Music
Yes, a piece of electronic will produce some noise. When the current flows through a conductor this will
generate a certain movement of the electrons and therefore: noise. And throughout the whole spectrum of
audio. Imagine what happens when this inherent noise will be amplified. Yes, today one can use "low-noise"
components but still such components will present a certain level of residual noise.
For example with tape recorders it will not be possible to get an S/N (signal to noise) ratio better than 70dB.
This level would not be accepted today by the increased sensitivity of the Listeners. It is possible to improve
the performance of a tape recorder: Absolutely no!
2.1.2 Introducing Audio Dynamics
The human ear can detect the noise generating by falling leaves as well as the roar generated by the taking
off space shuttle. Unfortunately no analog, nor digital device can reproduce such wide spectrum. Please look
at Chart. 1 and you will see the difference if dynamic capacity of various devices when compare to the human
ear. More problems occur when handling high level signals and low level signals. When you reach the high
level limit you may incur in distortion because of the dynamic range of the instrument therefore a certain
"reserve" must be maintained to avoid distortion.
This reserve is known as "headroom" and it is usually set at 10 20 dB. Would not be easier just to reduce
the operating level? Yes, it would. But you would put low level music signals at the same level of the basic
noise floor so the overall quality of the signal would be highly deteriorated. Please look at Chart. 2 and note
the Usable dynamic range (including headroom) versus high level distortion generated by peaks, and Noise
floor level.
4
Chart. 1 The dynamic range capabilities of various devices
Clipping Area
Clipping Signal heavily distorted
Usable dynamic range
Noise Area
Low level signal drowned out by noise
Chart. 2 The interactive relationship between the operating level and the headroom
So the operating level must be as high as possible but not high enough to generate distortion.
There is a very easy way to obtain this. With the volume knob in hand you increase the volume during low
passages and decrease the volume during loud passages. Unfortunately even the Great Houdini would not
be fast enough to monitor carefully the speed of the musical signal and it would be impossible to detect signal
peaks and consequently levelling them out. Manual control is therefore out of question. The answer is AGC
(automatic gain control); a device that will monitor the signal in real time and that will adjust the gain for the
best S/N ratio without producing distortion.
2.1.3 More about noise: Expanders and Noise-Gates
A lot of instruments such as microphones, amplifiers, guitar pickups, etc generate some noise, either at low
frequencies (hum) or at high frequencies (hiss). Such noise will inevitably interfere with the quality of your
audio signal. Now, if you scream into a microphone you will not hear the noise generated by such microphone
because such noise will be "masked" by the higher level of the signal, your voice in this case.
But if you sing into your microphone more gently in a soft passage, the level of the signal generated by your
voice will get much closer to the floor noise level and such floor noise will become disturbing. In order to kill
this problem Expanders and noise-gates are used. An expander is the opposite of a compressor: attenuating
the signal when the amplitude drops, they can limit the floor noise.
Now, we do not need dramatic expansion of a signal across the range; This would generate a resulting
dynamic range of over 150dB. For this reason the amplitude control will be applied only to those audio
signals which are below a set threshold. Those audio signals above the set threshold will not be affected.
Noise-gate can be regarded as a simple Expander. But the Expander will attenuate the audio signal contin
-uously below the set threshold while the noise-gate will simply dramatically cut-off the audio signal completely.
2.2 Voltage Controlled Amplifier (VCA)
The VCA is the soul of the
LTO GATE and it is one of the best components available today in his category
thanks to its excellent performances in terms of distortion, linearity, noise and temperature stability.
5
2.3 Inputs
2.3.1 Take it easy: Balanced Inputs
To make your life easy and clean we have provided
LTO GATE with electronically balanced inputs. Even if
you operate at high signal levels, hum and noise will be reduced automatically. There is also a servo-function
that will automatically adjust the internal level when unbalanced connectors are detected. The correction is
of 6dB and it will avoid differences in level in between input and output signal.
3. CONTROLS
7
4
THRESHOLD
THRESHOLD
GAIN REDUCTION (dB)
40
HOLD
35
11
30
20
0.5
15
10
6
3
1
MON.
0.5
1:2
15
1.2
35
30
20
0.5
15
10
6
MON.
0.5
3
THRESHOLD
1
500
COUPLE
1:2
15
35
THRESHOLD
GAIN REDUCTION (dB)
40
HOLD
CHANNEL 2
1.2
GATE
R
2
GAIN REDUCTION (dB)
40
HOLD
CHANNEL 1
500
1
30
20
0.5
15
10
6
3
1
MON.
0.5
COUPLE
1.2
GATE
GAIN REDUCTION (dB)
40
HOLD
CHANNEL 3
500
1:2
15
30
20
0.5
35
15
10
6
3
1
MON.
0.5
CHANNEL 4
500
COUPLE
1.2
GATE
1:2
15
LTO GATE
GATE
AUDIO INTERACTIVE
LTO
EXP.
BYPASS
10 0
dBu
THRESHOLD
Sec
HOLD
100
4
4 0.05
Sec
SC FILTER
RELEASE
5
6
Hz
FREQUENCY
0.7
Oct
BANDWIDTH
0
MODE 1:1
RANGE
EXP.
10 0
80 BYPASS
dBu
1:4
RATIO THRESHOLD
PARAMETRIC SC FILTER
EXPANDER / GATE
3
10K 2.3
8
9
4 0.05
Sec
HOLD
0
100
10K 2.3
0.7
Sec
SC FILTER
Hz
Oct
MODE 1:1
FREQUENCY
RELEASE
BANDWIDTH
RANGE
4
EXPANDER / GATE
EXP.
10 0
80 BYPASS
dBu
1:4
RATIO THRESHOLD
PARAMETRIC SC FILTER
4 0.05
Sec
HOLD
100
4
Sec
SC FILTER
RELEASE
EXPANDER / GATE
10K 2.3
Hz
FREQUENCY
0.7
Oct
BANDWIDTH
0
MODE 1:1
RANGE
PARAMETRIC SC FILTER
ON QUAD EXPANDER / GATE
EXP.
10 0
80 BYPASS
dBu
1:4
RATIO THRESHOLD
4 0.05
Sec
HOLD
100
4
Sec
SC FILTER
RELEASE
EXPANDER / GATE
10K 2.3
Hz
FREQUENCY
0.7
Oct
BANDWIDTH
PARAMETRIC SC FILTER
0
MODE 1:1
RANGE
OFF
80
1:4
RATIO
POWER
10 12 13
Pic. 1 The Front Panel of The
LTO GATE
Your
LTO GATE presents with four channels. Each channel is equipped with the same elements: 3 push-button
switches, 6 rotary controls and 11 LEDs. You can easily operate the stereo mode via pressing the Couple switch.
The details please refer to following content.
3.1 The Front Panel
1. Couple Switch
Pressing this push-button for stereo mode operation.
When engaged, the front channel will take control of the next channel and override all the controls and switches
of the next channel with exception of the SC Monitor.
2. POWER Switch
Turn the apparatus ON or OFF.
3. THRESHOLD Control
This control adjusts the threshold level for the Expander / Gate Section in the range of Bypass to +10dBu.
Signals below this level cause expansion.
4. THRESHOLD LED
The "+" LED lights up when the expander / gate is activated.
The HOLD LED lights up when the hold circuit starts to work.
The "-" LED lights up when there are no audio signals below the set threshold.
5. HOLD Control
It represents the amount of time that passes before the release process starts to work when the signal is below
the threshold point. (Used only in GATE mode.)
6. RELEASE Control
It determines the amount of time in the release process. The release time on
to 4 seconds. (Used only in GATE mode.)
6
LTO gate can be set from 0.05
7. GAIN REDUCTION Meter
It indicates the gain reduction. The range displayed is from 1 to 40 dB.
8. SC FILTER Switch
This switch is used to activate the parametric side-chain filter. You can set its function by adjusting the frequency
and bandwidth control.
9. FREQUENCY Control
This control is used to choose frequency of the side-chain filter from 100Hz to 10kHz.
10.BANDWIDTH Control
This control is used to choose bandwidth of the side-chain filter from 2.3 to 0.7 octaves.
11.MONITOR Control
You can connect the side-chain control signal to the audio output using this switch. Engage it to eliminate the
functions of expander and gate. There are only frequency and bandwidth controls that can control the unit.
12.MODE Switch
It can set the operational mode of this unit. You are able to operate it as an expender when it is pressed. On the
contrary, you can operate it as a gate when it is not pressed.
13.RANGE/RATIO Control
The control is relying on the operational mode of this unit. The RANGE control can only be used in GATE mode.
It adjusts the amount of maximum gain reduction and covers a range from 0 to -80. The RATIO control can only
be used in EXPANDER mode. It determines the ratio between the input and output level of audio signals below
the set threshold level. This control manually adjustable from 1:1 to 1:4.
3.2 The Rear Panel
14
AC INPUT
110-120V
220-240V
95-120V 60Hz
or 210-240V 50Hz
Rated Power
Consumption 18W
FUSE:
2
210-240V: T200mA 250VAC
95-120V: T400mA 250VAC
REPLACE FUSE WITH
CORRECT TYPE ONLY
Apparaten skall
anslutas till jordat
uttag nar den ansluts
till ett natverk
A101
15
2
1
3
17
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
INPUT
OUTPUT
CHANNEL 3
CHANNEL 2
1
3
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
INPUT
OUTPUT
CHANNEL 4
2
1
3
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
INPUT
OUTPUT
2
1
3
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
INPUT
OUTPUT
CHANNEL 1
16
Pic. 2 The Rear Panel of The
LTO GATE
14.FUSE Holder / Voltage Selector
Your unit may have the voltage selector ( 115V/60Hz or 230V/50Hz) built into the Fuse Holder. With a small
screwdriver pull/pop out the Fuse Holder and rotate it so that the arrow showing the proper voltage in your area
points toward the other arrow in the upper left comer of plug assembly and reinsert.
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 unit before repaired.
7
110-120V
220-240V
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.
To change, pull fuse-holder out and rotate 180 , then push in again.
15. AC Inlet
Please don't plug power cord into this unit and AC power if voltage has not been correctly set.
16. Audio In
The inputs are balanced XLR and 1/4" TRS connectors, they can be used to input signals.
17. Audio Out
The outputs are balanced XLR and 1/4" TRS connectors, they can be used to output signals.
4. INSTALLATION AND CONNECTION
4.1 Mains Connection
LTO GATE is provided with dual voltage plug. You must check the power supply voltage available in your country
before connecting the power cord in the wall outlet. Please see Page 8 for further information.
4.2 Audio Connection
The
LTO GATE is equipped with balanced XLR connectors as well as 1/4" phone jack and can be connected with
other units in different ways to support a vast range of applications without experiencing a signal loss.
a. Wiring Configuration
Both types of connectors available on LTO GATE can be wired in balanced and unbalanced modes.
Please see following drawing for details:
For 1/4" TRS jack
Hot (+ve)
Cold (-ve)
Gnd/Screen
Tip
Ring
Tip
Sleeve
Gnd/Screen
Unbalanced
Balanced
8
For XLR connector
2 Hot (+ve)
2 Hot (+ve)
3 Cold (-ve)
Link 3 to 1
1 Screen
1 Screen
XLR Unbalanced input
XLR Balanced input
b. In Line Connection
Please see following drawing for details:
Balanced
SLEEVE RING TIP
TIP RING SLEEVE
3
3
1
1
2
2
1
3
2
TIP RING SLEEVE
Tip
Ring
Sleeve
Tip
Ring
Sleeve
1
2
1
2
3
3
Tip
Ring
1
2
3
Sleeve
Unbalanced
1
Tip
Ring
3
2
Sleeve
TIP RING SLEEVE
Tip
1
3
2
Sleeve
1
2
3
1
2
3
1
TIP SLEEVE
2
3
1
2
3
Tip
TIP SLEEVE
SLEEVE TIP
Sleeve
Tip
Ring
TIP RING SLEEVE
SLEEVE RING TIP
Cent r e
Screen
Tip
Sleeve
Tip
Ring
Sleeve
Sleeve
Tip
Cent r e
Sleeve
Screen
Tip
Ring
Centre
Sleeve
Screen
TIP SLEEVE
TIP RING SLEEVE
3
3
1
1
1
2
2
2
3
1
2
3
c. Insert Points Connection
In case you are using the main inserts of your mixing console and you have a single jack for SEND and
RETURN, you can use an insert Y cable. Please see following drawing:
1/4" TRS insert
Send
Return
Gnd/Screen
Ring
Tip
Sleeve
9
Insert Leads
Tip
Ring
Sleeve
SLEEVE TIP
TIP RING SLEEVE
Tip (Send)
Sleeve
Sleeve
SLEEVE RING TIP
1
2 (Send)
1
3
Tip
Ring
Sleeve
2
2
3
1
TIP RING SLEEVE
3
1
2 (Return)
3
Tip
Ring
Sleeve
TIP RING SLEEVE
Centre (Send)
Screen
Centre (Return)
Screen
4.3 Rack Mounting
The most secure mounting is on a universal rack shelf available from various rack manufactures or your music
dealer. The LTO GATE 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 LTO GATE on high temperature devices
such as power amplifiers etc. to avoid overheating.
10
5. TECHNICAL SPECIFICATIONS
Connectors
Type
AUDIO INPUT
AUDIO OUTPUT
FUNCTION
SWITCHES
INDICATORS
GATE SECTION
EXPANDER
SECTION
PARAMETRIC
SC FILTER
SYSTEM
SPECIFICATIONS
POWER SUPPLY
POWER
CONSUMPTION
DIMENSIONS
WEIGHT
Max. Input Level
Impedance
CMRR
Connectors
Type
Max. Output Level
Impedance
Monitor
Couple
Mode
Filter
Gain Reduction
"-" indicator
"Hold" indicator
"+" indicator
Type
Range
Threshold
Attack
Hold
Release
Type
Attack
Ratio
Frequency
Bandwidth
Frequency Response
Noise
THD
IMD
Crosstalk
AC 95-120 Vac 60Hz
AC 210-240 Vac 50Hz
XLR and 1/4" JACK
RF filtered, servo-balanced input
Balanced and Unbalanced: +21 dBu
Balanced: 50kOhm Unbalanced: 25kOhm
typ.40dB, >55dB@1kHz
XLR and 1/4" JACK
Electronically servo-balanced output stage
Balanced and Unbalanced: +21dBu
Balanced: 60 Ohm Unbalanced: 30 Ohm
Monitors the side-chain key signal
Activates FlexLink function
Expander/Gate switch
Activates the side-chain Filter
8-segment LED display: 1/3/6/10/15/20/30/40dB
Signal is above threshold
Signal reaches threshold
Signal is below threshold
UTR (Ultra Transient Response) gate
Variable: from 0 to -80dB
Variable: from BYPASS to +10dBu
Program dependent
Variable: from 0 to 4sec
Variable: from 0.05 to 4sec
IRC (Interactive Ratio Control) expander
Program dependent
Variable: from 1:1 to 1:4
Variable: from 100Hz to 10kHz
Variable: from 2.3 to 0.7 oct.
From 20Hz to 30kHz
>90dBu, unweighted, 22Hz to 22kHz
0.01% typ. @+4dBu, 1kHz, GAIN 1
0.01% typ. SMPTE
<-100dB, 22Hz to 22kHz
Fuse: T400mAL (slow below)
Fuse: T200mAL (slow below)
18 Watts
483(W) 194.5(D) 44(H)mm (19 7.7 1.7)
3.3kg(7.27lb)
11
12
A
B
C
D
1
1
INPUT
INPUT
INPUT
INPUT
INPUT1
INPUT2
INPUT3
INPUT4
SGND
5e
3c
4d
2b
1a
INPUT4
PHONEJACK5 (5-PIN)
SGND
CN-BAL-FEMALE
4
2
3
4
1
SGND
5e
3c
4d
2b
1a
INPUT3
PHONEJACK5 (5-PIN)
SGND
CN-BAL-FEMALE
4
2
3
3
1
SGND
5e
3c
4d
2b
1a
INPUT2
PHONEJACK5 (5-PIN)
SGND
CN-BAL-FEMALE
4
2
3
2
1
SGND
5e
3c
4d
2b
1a
SGND
INPUT1
PHONEJACK5 (5-PIN)
CN-BAL-FEMALE
4
2
3
1
1
2
2
MON.
MON.
MON.
VCA
EXPANDER/GATE
CHANNEL 4
COUPLE
VCA
EXPANDER/GATE
CHANNEL 3
COUPLE
VCA
EXPANDER/GATE
CHANNEL 2
COUPLE
VCA
EXPANDER/GATE
MON.
PARAMETRIC SC FILTER
PARAMETRIC SC FILTER
PARAMETRIC SC FILTER
3
4
4
GAIN REDUCTION
RANGE/RADIO
GAIN REDUCTION
RANGE/RADIO
GAIN REDUCTION
RANGE/RADIO
GAIN REDUCTION
RANGE/RADIO
BLOCK DIAGRAM
PARAMETRIC SC FILTER
3
5
5
SGND
SGND
SGND
SGND
5e
3c
4d
2b
1a
5e
3c
4d
2b
1a
5e
3c
4d
2b
1a
5e
3c
4d
2b
1a
4
2
3
1
4
2
3
1
4
2
3
1
4
2
3
1
OUTPUT 1
OUTPUT 2
OUTPUT 3
6
OUTPUT 4
OUTPUT1
PHONEJACK5 (5-PIN)
CN-BAL-MALE
OUTPUT 4
OUTPUT1
PHONEJACK5 (5-PIN)
CN-BAL-MALE
OUTPUT 3
OUTPUT1
PHONEJACK5 (5-PIN)
CN-BAL-MALE
OUTPUT 2
OUTPUT1
PHONEJACK5 (5-PIN)
CN-BAL-MALE
OUTPUT 1
6
A
B
C
D
6. BLOCK DIAGRAM
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.
13
SEIKAKU TECHNICAL GROUP LIMITED
No. 1, Lane 17, Sec. 2, Han Shi West Road, Taichung 40151 Taiwan
http://www.altoproaudio.com Tel: 886-4-22313737
email: alto@altoproaudio.com Fax: 886-4-22346757
All rights reserved to ALTO. All features and content might be changed
without prior notice. Any photocopy, translation, or reproduction of part of this
manual without written permission is forbidden. Copyright c 2005 SEIKAKU GROUP
NF 01357-1.3
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