R
LTO
User's Manual
ALTO MONITOR
PA MONITOR PROCESSOR
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 2007 Seikaku Group
www.altoproaudio.com
Version 3.0 DEC. 2007
English
IMPORTANT SAFETY INSTRUCTION
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
TO REDUCE THE RISK OF ELECTRIC SHOCK
PLEASE DO NOT REMOVE THE COVER OR
THE BACK PANEL OF THIS EQUIPMENT.
THERE ARE NO PARTS NEEDED BY USER
INSIDE THE EQUIPMENT. FOR SERVICE,
PLEASE CONTACT QUALIFIED SERVICE
CENTERS.
WARNING
To reduce the risk of electric shock
and fire, do not expose this equipment
to moisture or rain.
Dispose of this product should
not be placed in municipal waste
and should be separate collection.
11. Move this Equipment only with a cart,
stand, tripod, or bracket,
This symbol, wherever used, alerts you to the
specified by the
presence of un-insulated and dangerous voltages
manufacturer, or
within the product enclosure. These are voltages that
sold with the
may be sufficient to constitute the risk of electric
Equipment. When
shock or death.
a cart is used, use
This symbol, wherever used, alerts you to
caution when
important operating and maintenance instructions.
moving the cart /
Please read.
equipment
Protective Ground Terminal
combination to
AC mains (Alternating Current)
avoid possible
Hazardous Live Terminal
injury from tip-over.
ON: Denotes the product is turned on.
12. Permanent hearing loss may be caused by
OFF: Denotes the product is turned off.
exposure to \ extremely high noise levels.
CAUTION
The US. Government's Occupational Safety
Describes precautions that should be observed to
and Health Administration (OSHA) has
prevent damage to the product.
specified the permissible exposure to noise
1. Read this Manual carefully before operation.
level.
2. Keep this Manual in a safe place.
These are shown in the following chart:
3. Be aware of all warnings reported
with this symbol.
HOURS X DAY SPL EXAMPLE
4. Keep this Equipment away from water and
90 Small gig
8
moisture.
92 train
6
5. Clean it only with dry cloth. Do not use
95 Subway train
4
solvent or other chemicals.
97 High level desktop monitors
3
6. Do not damp or cover any cooling opening.
100 Classic music concert
2
Install the equipment only in accordance with
102
the Manufacturer's instructions.
1,5
105
1
7. Power Cords are designed for your safety. Do
110
0,5
not remove Ground connections! If the plug
does not fit your AC outlet, seek advice from
0,25 or less 115 Rock concert
a qualified electrician. Protect the power
According to OSHA, an exposure to high SPL in
cord and plug from any physical stress to
excess of these limits may result in the loss of
avoid risk of electric shock. Do not place
heat. To avoid the potential damage of heat, it is
heavy objects on the power cord. This could
cause electric shock or fire.
recommended that Personnel exposed to
equipment capable of generating high SPL use
8. Unplug this equipment when unused for long
hearing protection while such equipment is
periods of time or during a storm.
under operation.
9. Refer all service to qualified service personnel
The apparatus shall be connected to a mains
only. Do not perform any servicing other than
those instructions contained within the
socket outlet with a protective earthing
User's Manual.
connection.
10. 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.
The mains plug or an appliance coupler is used
as the disconnect device, the disconnect device
shall remain readily operable.
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 provide 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.
9
7. TECHNICAL SPECIFICATION
Audio Input
Type
Impedance
Operating level
Maximum input level
CMRR
Audio Output
Type
Impedance
Maximum output level
System Specifications
THD+N%
Noise
Frequency response
Low cut filter
High pass filter
Low pass filter
Notch 1 frequency
Notch 2 frequency
Notch depth
Graphic EQ band separation
Indicators
Output level
Function switch
Power Supply
Main voltages
Power consumption
Fuse
Main connection
Physical
Dimension(W D H)
Weight
Active balanced XLR and 1/4" jack
Balanced: 50k Ohm/Unbalanced: 25k Ohm
+4 dBu/ 10 dBV
Balanced and Unbalanced: +19 dBm
>55 dB @1k Hz
XLR and 1/4" jack
Balanced: 60 Ohm / Unbalanced: 30 Ohm
+21 dBm
0.01% typ. 1k Hz, @+4 dBu
>-92 dBr unweighted 22 Hz to 22k Hz
10 Hz to 30k Hz, 3 dB
Variable (15 Hz to 360 Hz)
40 Hz
16k Hz
400~4k Hz/40~400 Hz
200~2k Hz/2k~20k Hz
Variable 0~-20 dB
2/3 Octave 1 15 bandVariable 0~-20 dB
8-segment LED display: -24/-18/-12/-6/0/+6/+12/+18 dB
LED indicator of every switch
USA/Canada: 95 120 VAC~60 Hz
Europe: 210 240 VAC~50 Hz
U.K/Australia: 240 VAC~50 Hz
8 Watts
95 120 V: T315mAL 250VAC
Standard
receptacle
95 120V:IEC
T315mA
250VAC
483 194.1 44 mm
2.8 Kg
IN THIS MANUAL:
1.
2.
3.
4.
5.
6.
7.
INTRODUCTION.......................................................................1
FEATURES..............................................................................1
CONTROL ELEMENTS.............................................................2
APPLICATION.........................................................................4
INSTALLATION & CONNECTION................................................5
BLOCK DIAGRAM...................................................................7
TECHNICAL SPECIFICATIONS...................................................8
8. WARRANTY............................................................................9
1. INTRODUCTION
Thank you for purchasing the very powerful
LTO PA Monitor Processor.
It is really efficient for PA monitor. Your LTO PA Monitor Processor is based
on many years of experience and is designed to provide studio engineer and
sound contractor with a precise equalization. It can be used to modify the
frequency "contour" of a sound, eliminate the unwanted frequencies and
suppress the feedback well.
Enjoy your
operation.
LTO MONITOR and make sure to read this Manual carefully before
2. FEATURES
Illuminated Power Switch
Mountable in a 19" rack unit
1/4" TRS type jack and balanced XLR connectors available
LED Meter (8 LEDs) to read Output
Low Pass and High Pass filters available to cancel unwanted frequencies
Bypass function
15-band graphic equalizer, low cut filter and notch available
Inverter switch to compensate for phase cancellation
Accurately suppress the feedback
8
1
SP
OT
L
IG
3.
3. CONTROL
CONTROLELEMENTS
ELEMENTS
6. BLOCK DIAGRAM
HT
Front Panel
5
6
8
9
12 14
16
OUTPUT LEVEL(dB)
24
12
6
6
6
12
40Hz
18
12
HI-PASS
0
0
12
6
6
25
40
63
100
160
250
400
630
1K
1.6K
2.5K
4K
6.3K
10K
16K
LEVEL
Bypass
ON
6
12
360
FREQUENCY (Hz)
Bypass
ON
LOW CUT FILTER
3
4
12
7
10
20
0
10
1
dB
DEPTH
Bypass
ON
NOTCH1
13
20K
2K
2K
200
FREQUENCY (Hz)
0
10
1
NOTCH2
11
LTO MONITOR
ON
MODE
MODE
400
4K
400
40
FREQUENCY (Hz)
18
1
3
MODE
15
15 BAND GRAPHIC EQUALIZER
2
INVERTER
270
RANGE
6
12
6
0
0
LOW-PASS
25
MODE
6
16KHz
90
R
LTO
PA/MONITOR
PROCESSOR
OFF
6
20
dB
DEPTH
dB
Bypass
ON
MASTER VOL.
15
POWER
1
1 POWER Switch
When you set this switch to "ON" position, the unit will be turned on; when
you set it to "OFF" position, the unit will be turned off.
2 Graphic Equalizer
These controls will boost or attenuate (either 6 dB or 12 dB) the selected
frequencies. When all slider potentiometers are set in center position, the
frequency response is flat (no boost and attenuate).
3 LEVEL Fader
This fader is used to adjust the input level, which can be varied from -6 dB to
+6 dB.
4 MODE Switch
Engage this switch, it will insert the 15 band graphic equalizer and HI/LOW
Pass filter into signal path, and the next LED (green) will illuminate. When this
switch is in bypass mode, the 15 band graphic equalizer and HI/LOW Pass will
be bypassed.
5 HI-PASS Switch
Engage this switch, it will cut the low frequencies at 40 Hz (12 dB per octave),
and the next LED (green) will illuminate.
6 LOW-PASS Switch
Engage this switch, it will cut the high frequencies at 16k Hz (12 dB per
octave), and the next LED (green) will illuminate.
7 RANGE Switch
This switch is used to choose the gain range of the filter potentiometer either
+6 dB or +12 dB. Up for +6 dB, down for +12 dB.
2
7
SP
3.
ELEMENTS
5. CONTROL
INSTALLATION
AND CONNECTION
Sleeve
Strain Clamp
9 INVERTER Switch
Engage this switch to reverse the audio signal's phase by 180 . In this case, it
may alter the audio phase to compensate for phase cancellation. The next LED
will display whether the function is active or not.
Use for Insert Points
1/4" Stereo (TRS) Jack Plug
2
3
1
2=Hot(+)
1=Ground/Screen
10 MODE Switch (LOW-CUT Filter Section)
2
3
1
Engage this switch to insert the Low-Cut filter into signal path, and the next
LED (green) will illuminate. When this switch is in bypass mode, the Low-Cut
filter will be bypassed.
1=Ground/Screen
3=Cold(-)
3=Cold(-)
Use for Balanced Mic Inputs
(For unbalanced use, connect pin 1 to 3)
Use for Main output
(For unbalanced use, leave pin3 unconnected)
3-pin XLR Male Plug
3-pin XLR Line Socket
(seen from soldering side)
(seen from soldering side)
SLEEVE TIP
TIP RING SLEEVE
Tip
Ring
Sleeve
11 MODE Switch (NOTCH Filter Section)
By engaging this switch, you will insert the Notch filter into the signal path,
and the next LED (green) will illuminate. When this switch is in bypass mode,
the Notch filter will be bypassed.
12 1/ 10 Selection Switch
Tip (Send)
Sleeve
Tip (Return)
Sleeve
SLEEVE RING TIP
1
2 (Send)
1
3
2
Tip
Ring
Sleeve
2
3
1
2 (Return)
3
1
TIP RING SLEEVE
3
Tip
Ring
Sleeve
Screen
Centre (Return)
Insert Leads
5.3 Rack Mounting
The most secure mounting is on a universal rack shelf available from various
rack manufacturers or your music dealer. The LTO PA Monitor Processor
fits into one standard 19" rack unit of space. Be sure that there is enough
air space around the unit for sufficient ventilation and please do not place
the LTO Monitor PA/Monitor Processor on high temperature devices such
as power amplifiers etc. to avoid overheating.
6
This switch is used to change the selected range of the frequency. Engage the
switch ( 1), the adjustable frequency range goes from 40 Hz~400 Hz (Notch1)
or 200 Hz~2k Hz (Notch2), and the next LED will illuminate. Otherwise, engage
the switch ( 10), and the adjustable frequency range goes from 400 Hz~4k Hz
(Notch1) or 2k Hz~20k Hz (Notch2).
13 FREQUENCY Control (Notch Filter Section)
This control provides two frequency ranges. For the details, please refer to the
above. Rotate this knob to control the howling resonance frequency response
at room.
Centre (Send)
Screen
TIP RING SLEEVE
3.
3. CONTROL
CONTROLELEMENTS
ELEMENTS
HT
Through this control, you can select the frequency that you want to cut off, the
adjustable range goes from 15 Hz to 360 Hz.
Tip=Send Signal
Sleeve=Ground/Screen
2=Hot(+)
IG
8 FREQUENCY Control
Ring=Return Signal
Tip
Ring
OT
L
14 DEPTH Control
Rotate this control to adjust the variation, which can be varied from 0 dB to
-20 dB.
15 MASTER VOL. Control
Rotate this knob to attenuate or boost the output level, which can be varied
from - to +6 dB.
16 OUTPUT LEVEL Meter
The meter displays the output level, and the range is from -24 dB to +18 dB.
3
SP
OT
L
IG
3.
3. CONTROL
CONTROLELEMENTS
ELEMENTS
3.
ELEMENTS
5. CONTROL
INSTALLATION
AND CONNECTION
HT
Rear Panel
AC INPUT
95-120V /210-240V 60-50Hz
Rated Power Consumption 8W
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
FUSE:
210-240V: T200mAL 250VAC
95-120V: T315mA 250VAC
REPLACE FUSE WITH CORRECT
TYPE ONLY
Apparaten skall anslutas till
jordat uttag nar den ansluts
till ett natverk
17
OUTPUT
INPUT
INPUT
19
18
17 AC Inlet and Fuse Holder
Standard IEC receptacle. Connect your LTO MONITOR to the AC with the
supplied AC power cord. Before powering up your LTO MONITOR for the
first time, make certain the stated power requirement of the unit matches the
voltage supplied by the AC socket.
If the fuse blows, replaced with a fuse of the correct type only.
18 Input Connectors
The input connectors are supplied with XLR and 1/4" TRS jack, it is used to
input the signal.
19 Output Connectors
The output connectors are supplied with XLR and 1/4" TRS jack, it is used to
output the signal.
3.
ELEMENTS
4. CONTROL
APPLICATION
IN MONITOR SYSTEM
Ok, you have got to this point and you are now in the position to operate your
LTO MONITOR successfully. However, we advise you to read carefully the
following section to be the real master of your own unit. Not paying attention
enough to the input signal level, to the routing of the signal and the assignment
of the signal will result in unwanted distortion, a corrupted signal or no sound
at all. So you should follow these procedures for every single channel:
5.1 Mains Connection
Please ensure that the LTO MONITOR 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. The mains connection of the LTO
MONITOR is made by using the enclosed mains cord and a standard IEC receptacle.
It meets all of the international safety certification requirements.
5.2 Audio Connection
The LTO MONITOR presents with balanced XLR&1/4" TRS connectors. It
can be interfaced in several ways to support a variety of applications without
any signal loss. The LTO MONITOR can be used on a single instrument by
connecting to the mixing console's main inserts, or on an entire mix "in-line" between
a mixing console's outputs and a power amplifier. The defective wiring may degrade
the performance of LTO MONITOR, so please use good quality screened audio
cables only. Please follow the guide below to interface LTO MONITOR without
experiencing any noise or signal loss.
AC INPUT
95-120V /210-240V 60-50Hz
Rated Power Consumption 8W
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
FUSE:
Sleeve
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
210-240V: T200mAL 250VAC
95-120V: T315mA 250VAC
REPLACE FUSE WITH CORRECT
TYPE ONLY
Tip
Ring
Ring=Right Signal
Strain Clamp
Apparaten skall anslutas till
jordat uttag nar den ansluts
till ett natverk
OUTPUT
Tip=Left Signal
INPUT
INPUT
Sleeve=Ground/Screen
Input
Output
Use for Headphone
1/4" Stereo (TRS) Jack Plug
Monitor AMP Input
AUX Send
Sleeve
D1
SIG CLIP PROT
18
16
20
6
500W
SIG CLIP PROT
18
22
24
26
12
CH1
28
30 (dB)
16
20
2
6
Tip
22
24
26
12
CH2
MIC level signal
28
30 (dB)
Monitor AMP Output
Tip=Signal
Strain Clamp
Sleeve=Ground/Screen
Use for Mono Line In, Mono 1/4" Jack Plugs
1/4" Mono (TS) Jack Plug
Monitor Speaker
4
5