LTO ALTO GATE User manual

User's Manual
LTO
R
www.altoproaudio.com
Version 1.0 July 2003
English
EXPANDER/GATE
ALTO GATE

1
SAFETY RELATED SYMBOLS
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
This symbol, wherever used, alerts you to the pre-
sence of un-insulated and dangerous voltages with-
in the product enclosure. These are voltages that
may be sufficient to constitute the risk of electric
shock or death.
Protective Ground Terminal
AC mains (Alternating Current)
Hazardous Live Terminal
ON: Denotes the product is turned on.
This symbol, wherever used, alerts you to impo-
rtant operating and maintenance instructions.
Please read.
OFF: Denotes the product is turned off.
WARNING
Describes precautions that should be observed to
prevent the possibility of death or injury to the user.
CAUTION
Describes precautions that should be observed to
prevent damage to the product.
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.
Unplug the product before electrical storms occur
and when unused for long periods of time to reduce
the risk of electric shock or fire.
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.
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.
Covers should be removed by qualified service
personnel only.
No user serviceable parts inside.
Fuse
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.
Protective Ground
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.
Operating Conditions
Always install in accordance with the manufacturer's
instructions.
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.
Do not install this product near any direct heat source.
Do not block areas of ventilation. Failure to do so
could result in fire.
Keep product away from naked flames.
IMPORTANT SAFETY INSTRUCTIONS
Read these instructions
Follow all instructions
Keep these instructions. Do not discard.
Heed all warnings.
Only use attachments/accessories specified by the
manufacturer.
Power Cord and Plug
Do not tamper with the power cord or plug. These are
designed for your safety.
Do not remove Ground connections!
If the plug does not fit your AC outlet seek advice from
a qualified electrician.
Protect the power cord and plug from any physical
stress to avoid risk of electric shock.
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 use any solvents such as Benzol or Alcohol.
For safety, keep product clean and free from dust.
Servicing
Refer all servicing to qualified service personnel only.
Do not perform any servicing other than those instruc-
tions contained within the User's Manual.
WARNING

PREFACE
Dear Customer:
researches.
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 ound rocessor) and a large range of state of the art algorithms which have been developed by ourSP
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, music-
ians 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
Thanks for choosing LTO GATE and thanks for choosing one of the results of LTO AUDIO TEAM job and

TABLE OF CONTENTS
1. INTRODUCTION........................................................................................................................................4
2.1 Some Technical Stuff
2. THE CONCEPT BEHIND.........................................................................................................................4
2.2 Voltage Controlled Amplifier (VCA)
2.3 Inputs
3. CONTROLS................................................................................................................................................6
3.1 The Front Panel
3.2 The Rear Panel
3
5. TECHNICAL SPECIFICATIONS .................................................................................................................................11
6. BLOCK DIAGRAM .....................................................................................................................................................12
4. INSTALLATION AND CONNECTION.......................................................................................................8
5.1 Mains Connection
5.2 Audio Connection
5.3 Rack Mounting
7. WARRANTY ...............................................................................................................................................................13

1. INTRODUCTION
Feature List:
2.1 Some Technical Stuff
4
2. THE CONCEPT BEHIND
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.
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.
2.1.1 It is not just Music
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.
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.
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.
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
Super quality parts and rigid configuration for long life and full credibility
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.

5
Chart. 1 The dynamic range capabilities of various devices
Chart. 2 The interactive relationship between the operating level and the headroom
Clipping Signal heavily distortedClipping Signal heavily distorted
Low level signal drowned out by noiseLow level signal drowned out by noise
Clipping Area
Noise Area
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.
Usable dynamic range
2.1.3 More about noise: Expanders and Noise-Gates
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.
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.
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.
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.

6
2.3 Inputs
2.3.1 Take it easy: Balanced Inputs
3. CONTROLS
Pic. 1 The Front anel of he LTO GATEPT
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.
1
2. POWER Switch
Turn the apparatus ON or OFF.
3.1 The Front Panel
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.
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.
R
LTO
POWER
ON
OFF
Hz Hz Hz
FREQUENCY FREQUENCY FREQUENCY
500 500
10K 10K 10K100 100 100
Oct Oct Oct
BANDWIDTH
1.2 500 1.2 1.2
0.7 0.7 0.72.3 2.3 2.3
SC FILTER SC FILTER SC FILTER
MON. MON. MON.
1515
80
0
1:1
RANGE
0
1:2 1:2
dBu dBu
35 35 35
10 10
Sec Sec SecSec Sec
0.5 0.50.5 0.5 0.5 0.5
44 4
0
0044 4
0.05 0.05 0.05
HOLD HOLD HOLD
Sec
RELEASE RELEASE RELEASE
THRESHOLD
HOLD 40 30 20 15 10 6 3 1
MODE MODE MODE MODE
CHANNEL 1 CHANNEL 3 CHANNEL 4
GATE GATE GATE
EXP.
COUPLE COUPLE COUPLE
RANGE RATIO
PARAMETRIC SC FILTER
EXPANDER / GATE
PARAMETRIC SC FILTER
CHANNEL 2
1:1 1:4
THRESHOLD
dBu
GATE
1
40 30 20 15 10 6 3
THRESHOLD
HOLD
GAIN REDUCTION (dB)GAIN REDUCTION (dB)
1
40 30 20 15 10 6 3
HOLD
THRESHOLD GAIN REDUCTION (dB)
Hz
FREQUENCY
500
10K100
Oct
SC FILTER
MON.
15
80
0
1:2
dBu
35
10
Sec Sec
0.5 0.5
4
04 0.05
HOLD RELEASE
RANGE RATIO
1:1 1:4
1
40 30 20 15 10 6 3
HOLD
THRESHOLD GAIN REDUCTION (dB)
1.2
0.72.3
15
1:2
80
0
AUDIO INTERACTIVE
QUAD EXPANDER / GATE
LTO GAT E
THRESHOLD BANDWIDTH THRESHOLD BANDWIDTH THRESHOLD BANDWIDTH
BYPASSBYPASS BYPASS
10
BYPASS
RANGE RATIO
1:1 1:4
EXP.EXP.EXP.
80 10
RATIO
1:4
EXPANDER / GATE EXPANDER / GATE PARAMETRIC SC FILTER EXPANDER / GATE PARAMETRIC SC FILTER
2
3
4
56
7
8 9 10
11
12 13
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.
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.
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 LTO gate can be set from 0.05
to 4 seconds. (Used only in GATE mode.)

7
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.
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.
Pic. 2 The Rear Panel of The LTO GATE
14
15
3.2 The Rear Panel
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.
AC INPUT
95-120V 60Hz
or 210-240V 50Hz
Rated Power
Consumption 18W
FUSE:
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
INPUT OUTPUT INPUT
OUTPUT
INPUT
OUTPUT
INPUT
OUTPUT
CHANNEL 1
CHANNEL 2CHANNEL 4 CHANNEL 3
A101
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
21
3
110-120V
220-240V
21
3
21
3
21
3
17 16

15. AC Inlet
Please don't plug power cord into this unit and AC power if voltage has not been correctly set.
THIS IS SET FOR
110V AC TO 120V
AC OPERATION
THIS IS SET FOR
220V AC TO 240V
AC OPERATION
220-240V
110-120V
110-120V
220-240V
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.
8
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.
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
Unbalanced Balanced
Gnd/Screen
Tip
Hot (+ve)
Cold (-ve)
Gnd/Screen
Tip
Ring
Sleeve

9
For XLR connector
XLR Unbalanced input XLR alanced inputB
2 Hot (+ve)
3 Cold (-ve)
1 Screen
Link3to1
2 Hot (+ve)
1 Screen
b. In Line Connection
Please see following drawing for details:
Tip
Ring
Sleeve
Tip
Ring
Sleeve
Tip
Sleeve
Tip
Sleeve
Tip
Sleeve
Cent er
Cent er
Centre
Screen
Screen
Screen
1
2
3
Tip
Ring
Sleeve
1
2
3
1
2
3
TIP SLEEVE
TIP SLEEVE
TIP RING SLEEVE
TIP RING SLEEVE
12
3
21
3
21
3
Tip
Ring
Sleeve
Tip
Ring
Sleeve
Tip
Ring
Sleeve
1
2
3
1
2
3
1
2
3
Tip
Ring
Sleeve
1
2
3
Tip
Sleeve
1
2
3
TIP RING SLEEVE
TIP RING SLEEVE
TIP SLEEVE
SLEEVE RING TIP
Unbalanced
TIP RING SLEEVE
Balanced
21
3
12
3
12
3
12
3
12
3
SLEEVE TIP
SLEEVE RING TIP
Send
Return
Gnd/Screen
Tip
Ring
Sleeve
1/4" TRS insert
c. Insert Points Connection
RETURN, you can use an insert Y cable. Please see following drawing:
In case you are using the main inserts of your mixing console and you have a single jack for SEND and

10
TIP RING SLEEVE
21
3
12
3
TIP RING SLEEVE
SLEEVE TIP
SLEEVE RING TIP
TIP RING SLEEVE
Insert Leads
Centre (Send)
Screen
Centre (Return)
Screen
Tip
Ring
Sleeve
Tip (Send)
Sleeve
Sleeve
Tip
Ring
Sleeve
1
2 (Send)
3
1
2 (Return)
3
Tip
Ring
Sleeve
4.3 Rack ountingM
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.
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.

11
AUDIO INPUT
AUDIO OUTPUT
FUNCTION
SWITCHES
GATE SECTION
IRC (Interactive Ratio Control) expander
5. TECHNICAL SPECIFICATIONS
Connectors
Type
Impedance
Connectors
Type
Max. Output Level
Impedance
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 Fuse: T400mAL (slow below)
AC 210-240 Vac 50Hz Fuse: T200mAL (slow below)
3.3kg(7.27lb)
Max. Input Level
CMRR
XLR and 1/4" JACK
RF filtered, servo-balanced input
alanced: 50kOhm nbalanced: 25kOhmBU
Balanced and Unbalanced: +21dBu
XLR and 1/4" JACK
Electronically servo-balanced output stage
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
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
BUalanced and nbalanced: +21 dBu
typ.40dB, >55dB@1kHz
EXPANDER
SECTION
POWER SUPPLY
Monitor
Couple
INDICATORS
PARAMETRIC
SC FILTER
SYSTEM
SPECIFICATIONS
POWER
CONSUMPTION 18 Watts
DIMENSIONS 483(W) 194.5(D) 44(H)mm (19 7.7 1.7)
WEIGHT

12
123456
A B C
D
6
5
4
3
2
1
D
C B A
BLOCK DIAGRAM
3c 5e 1a 4d 2b
INPUT2
PHONEJACK5 (5-PIN)
2 1 3 4
INPUT2
CN-BAL-FEMALE
SGND SGND
3c 5e 1a 4d 2b
INPUT3
PHONEJACK5 (5-PIN)
2 1 3 4
INPUT3
CN-BAL-FEMALE
SGND SGND
3c 5e 1a 4d 2b
INPUT4
PHONEJACK5 (5-PIN)
2 1 3 4
INPUT4
CN-BAL-FEMALE
SGND SGND
3c 5e 1a 4d 2b
INPUT1
PHONEJACK5 (5-PIN)
2 1 3 4
INPUT1
CN-BAL-FEMALE
SGND SGND
VCA
MON.
EXPANDER/GATE RANGE/RADIO
PARAM ETRIC SC FILTER
GAIN REDUCTION
MON.
RANGE/RADIO
GAIN REDUCTION
MON.
EXPANDER/GATE RANGE/RADIO
PARAM ETRIC SC FILTER
GAIN REDUCTION
MON.
EXPANDER/GATE RANGE/RADIO
PARAM ETRIC SC FILTER
GAIN REDUCTION
INPUT 1
INPUT 2
INPUT 3
INPUT 4
3c 5e 1a
4d 2b
OUTPUT1
PHONEJACK5 (5-PIN)
SGND
OUTPUT 1
3c 5e 1a
4d 2b
OUTPUT1
PHONEJACK5 (5-PIN)
SGND
OUTPUT 2
3c 5e 1a
4d 2b
OUTPUT1
PHONEJACK5 (5-PIN)
SGND
OUTPUT 3
3c 5e 1a
4d 2b
OUTPUT1
PHONEJACK5 (5-PIN)
SGND
OUTPUT 4
2 1 3 4OUTPUT 1
CN-BAL-MALE
2 1 3 4OUTPUT 2
CN-BAL-MALE
2 1 3 4OUTPUT 3
CN-BAL-MALE
2 1 3 4OUTPUT 4
CN-BAL-MALE
VCA
EXPANDER/GATE PARAM ETRIC SC FILTER
VCA VCA
CHANNEL 2
COUPLE
CHANNEL 3
COUPLE
CHANNEL 4
COUPLE
6. BLOCK DIAGRAM

13
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 warrants that this product will be free from any defects in materials and/or workmanship for a period LTO
of 1 year from the purchase date if you have completed the Warranty Registration Card in time.
3.3 During the warranty service, may repair or replace this product at its own option at no charge to you for LTO
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:
Normal tear and wear.
Instead of operating in accordance with the user's manual thoroughly, any abuse or misuse of this product.
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 be liable for any incidental or consequential damages. Some states do not allow the exclu- LTO
sion 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.
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.

SEIKAKU TECHNICAL GROUP LIMITED
No. 1, Lane 17, Sec. 2, Han Shi W. Road, Taichung, 401 Taiwan
http://www.altomobile.com Tel: [phone]
email: [email protected] Fax: [phone]
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 2004 Seikaku Technical Group Limited.
c
NF01357-1.0