Nilfisk ALTO Stereo Equalizer ALTO Q User Manual

User's Manual  
ALTO Q  
5-BAND PARAMETRIC EQUALIZER  
R
Version 2.1 Dec. 2002  
English  
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PREFACE  
Dear Customer:  
Thanks for choosing LTO-Q 5-Band Parametric Equalizer and thanks for choosing one of the results of LTO  
AUDIO TEAM job and 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  
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 would 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, and the best fruits of our continuous researches and the  
best prices.  
Our LTO 5-Band Parametric Equalizer is the result of many hours of listening and tests involving common  
people, area experts, musicians and technicians.  
The results of this effort is a high-end 5-Band Parametric Equalizer which will provide a permanent precise equ-  
alization to the musician, performer, studio engineer and sound contractor.  
Nothing else to add, but that we would like to thank all the people that made the LTO 5-Band Parametric  
Equalizer a reality available to our customers, thank our designers and all 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
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TABLE OF CONTENT  
1. INTRODUCTION ....................................................................................................................................4  
2. FEATURES ............................................................................................................................................4  
3. ELEMENT CONTROLS..........................................................................................................................4  
3.1 The Front Panel  
3.2 The Rear Panel  
4. INSTALLATION & CONNECTION .........................................................................................................6  
4.1 Mains Connection  
4.2 Audio Connection  
- Wiring Configuration  
- In Line Connection  
- Insert Points Connection  
4.3 Rack Mounting  
5. APPLICATION...........................................................................................................................................8  
5.1 The Frequency Range of music Instruments  
5.2 Using your LTO-Q in a sound reinforcement system  
5.3 Application on single instrument  
5.4 Application on main MIX  
6. TECHNICAL SPECIFICATIONS ...........................................................................................................10  
7. WARRANTY ..........................................................................................................................................11  
3
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1. INTRODUCTION  
With LTO-Q you have acquired an indispensable toll to add clarity and flexibility to your music. The LTO-Q 5 bands  
parametric equaliser will provide precise audio signal control to fixed sound installation, live performance and studio  
applications. Thanks to the use of selected and expensive components the performances of LTO-Q are worth much  
more than its price: Variable Q controls allow you to notch out unwanted frequencies while sweepable frequency control  
add maximum flexibility to your mix.  
2.FEATURES  
Mountable in one standard rack unit 19"  
1/4" TRS type jack and balanced XLR connectors available  
Led Meter (12 LED) to read input and output  
Low cut and high cut filters available to cancel unwanted frequencies  
Bypass function to connect automatically input and output  
Optimum transparency of the audio signal and minimum phase shift insured by the parallel architecture of the filters  
Switch-on button on every single band  
Constant Q principle combination  
5 bands of equalisation fully parametric (gain, frequency, Q) for studio and live applications  
The frequency range of the single 5 bands is overlapping. This will allow extreme boost or attenuation  
3.ELEMENT CONTROLS  
3.1 The Front Panel  
11  
4
2
INPUT  
/
OUTPUT LEVEL (dB)  
BAND  
1
BAND  
2
BAND  
3
BAND  
500Hz  
4
BAND  
5
IN  
/
OUT  
IN  
/
OUT  
IN  
/
OUT  
IN  
/
OUT  
IN  
/
OUT  
-30 -24 -18 -12 -6  
-3  
0
+3 +6 +9 +12 +18  
I
/
O
METER  
20Hz  
-
400Hz  
IN  
OUT  
60Hz  
-
1KHz  
IN  
OUT  
150Hz  
-
2.5KHz  
IN  
OUT  
-
8KHz  
IN  
OUT  
1KHz  
-
20KHz  
IN  
OUT  
OUTPUT  
INPUT  
2.3  
75  
10  
0
110  
1.2  
0
260  
1.2  
0
720  
1.2  
0
1.2  
0
5.1  
1.2  
0
Q
5-BAND PARAMETRIC  
EQUALIZER  
45  
30  
150  
250  
-5  
+5  
120  
360  
600  
-5  
+5  
350  
1K  
1.6K  
-5  
+5  
1.0  
+10 0.6  
3.1  
4.8  
-5  
+5  
2.2  
7.0  
-5  
+5  
50  
+10 25  
110  
7
15  
-5  
+5  
R
ON  
-10  
+10 70  
-10  
+10 200  
-10  
-10  
+10 1.3  
12  
-10  
200  
3.5  
22  
+10  
AUDIO  
-10  
OFF  
0.5  
8.0  
IN  
OUT  
20  
400  
0.03  
OCTAVE  
1.6  
-15  
+15  
60  
1K  
0.03  
OCTAVE  
1.6  
-15  
+15  
150  
2.5K  
0.03  
OCTAVE  
1.6  
-15  
+15  
0.03  
OCTAVE  
1.6  
-15  
+15  
1.0  
20  
0.03  
OCTAVE  
1.6  
-15  
+15  
10  
400  
2.5  
30  
-15  
+15  
dB  
KHz  
Hz  
dB  
Hz  
dB  
Hz  
dB  
dB  
KHz  
dB  
Hz  
KHz  
FREQUENCY  
BANDWIDTH  
LEVEL  
FREQUENCY  
BANDWIDTH  
LEVEL  
FREQUENCY  
BANDWIDTH  
LEVEL  
FREQUENCY  
BANDWIDTH  
LEVEL  
FREQUENCY  
BANDWIDTH  
LEVEL  
LOW CUT  
HIGH CUT  
INPUT  
POWER  
10  
9
8
7
6
5
3
1
Your LTO-Q includes 5 channels of equalisation. 3 rotary controls and 1 switch are present in each channel. The  
Master Section includes the power switch, 2 push-on switches, 3 rotary controls and 12 LED's.  
1.POWER switch  
When you set this switch in ON position (green light on) the unit will be turned on. When you set this switch in  
OFF position (green light off) the unit will be turned off.  
2.The INPUT/OUTPUT control  
With this control in ON position, the Led Meter will read the output level. With this control in OFF position, the Led  
Meter will read the input level.  
3.The AUDIO IN/OUT control  
The input jack of your LTO-Q is directly connected to the output jack when this control is OFF or if the unit is not  
connected to the AC socket. It is used to cause a "hard-bypass" and disable the equalisation process in the signal  
path.  
4.The INPUT/OUTPUT LEVEL  
The readable range of this 12 segments LED display is -30dB to +18dB. As mentioned before it will read either the  
INPUT or the OUTPUT level depending on the position of the switch (2).  
4
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5.The INPUT control  
You can control the amount of the audio signal fed into your LTO-Q via this control. The range goes from -15dB  
to +15dB.  
6.The HIGH CUT control  
This control, when activated will cut the high frequencies with a slope of 12dB per octave in a range of 2.5 kHz to  
30 kHz. So if you set this control at the maximum position of 30 kHz, the audio signal will pass through without  
alteration.  
7.The LOW CUT control  
This control, when activated will cut the low frequencies with a slope of 12dB per octave in a range of 10 Hz to  
400 Hz. So if you set this control at the minimum position of 10 Hz, the audio signal will pass through without  
alteration.  
8.The LEVEL control  
The level boost or attenuation is set with this control. The adjusting range goes from -15dB to +15dB.  
9.The BANDWIDHT control  
This control adjusts the width and can be set from a minimum of 0.03 octaves to a maximum of 1.6 octaves.  
10.The FREQUENCY control  
This control set the center frequency point of the filter.  
11.IN/OUT switch  
It activates/disactivates the correspondent band.  
3.2 The Rear Panel  
12  
AC INPUT  
1 1 0 - 1 2 0 V  
TIP  
/
SLEEVE  
/
RING  
PIN  
2
PIN3  
TIP  
/
SLEEVE  
/
RING  
PIN  
2
PIN3  
95-120V /210-240V 60-50Hz  
Rated Power Consumption 9W  
/
PIN  
1
/
PIN  
1
220-240V  
FUSE:  
NEW TIDE  
3
NEW TIDE  
3
210-240V: T200mAL 250VAC  
95-120V: T315mA 250VAC  
REPLACE FUSE WITH CORRECT TYPE ONLY  
2
1
2
1
Apparaten skall anslutas till  
jordat uttag nar den ansluts  
till ett natverk  
A101  
OUTPUT  
INPUT  
13  
15  
14  
12.Voltage Selector and Fuse Holder  
You must be sure of the Voltage available in your Country because this is a Dual Voltage Unit. Voltage operation  
can be changed through the fuse protecting the power supply but this operation must be performed by a qualified  
Engineer.  
1 1 0 - 1 2 0 V  
2 2 0 - 2 4 0 V  
110-120V  
220-240V  
THIS IS SET FOR  
110V AC TO 120V  
AC OPERATION  
THIS IS SET FOR  
220V AC TO 240V  
AC OPERATION  
Please note the triangular markers on both sides of the fuse holder (See figure above), To change the voltage pull  
the fuse holder out, rotate it 180 and push it back again. The operating voltage will be indicated by one of the two  
triangular markers.  
5
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13.AC Inlet  
After the correct voltage has been set you can connect the AC plug to the unit and in the AC power socket.  
14.Input Connectors  
Both XLR and 1/4" TRS jack input connectors are supplied in your LTO-Q for maximum flexibility.  
15.Output Connector  
Both XLR and 1/4" TRS jack output connectors are supplied in your LTO-Q for maximum flexibility.  
4. INSTALLATION & CONNECTION  
4.1 Mains Connection  
A Main AC cable that meets all the international safety regulations is supplied with your LTO-Q. Please make  
sure of the supply voltage available in your Country before plugging in the power cord into the AC socket.  
4.2 Audio Connection  
Both XLR and 1/4" TRS connectors are available on your LTO-Q. In this way you can interface your LTO-Q in  
several different ways without experiencing any noise or signal loss. You can use your LTO-Q with single instruments  
using the mixers main insert or on the complete mix connecting the LTO-Q in between the mixer and the power amp-  
lifier.  
- Wiring Configuration  
Either the 1/4" TRS phone jack or the XLR connector can be wired in balanced and unbalanced modes, which will  
be determined by the actual application status, please wire your system as the following wiring examples:  
For 1/4" Phone jack  
+
+
+
-
Tip  
Sleeve  
Tip  
Sleeve  
Tip  
Ring  
Ring  
Sleeve  
TS Type Unbalanced  
TRS Type Balanced  
TRS Type Unbalanced  
For XLR connector  
Pin2 (+)  
Pin2 (+)  
Pin3 (-)  
Pin3 (-)  
(Linked to Pin1 manually,  
)
Pin1 (  
)
Pin1 (  
)
XLR Type Unbalanced  
XLR Type Balanced  
- In Line Connection  
For these applications the 5-Band Parametric Equalizer provides 1/4" TRS connectors and XLR connectors to  
easily interface with most any professional audio device. Follow the configuration examples below for your parti-  
cular connection.  
6
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Balanced  
Tip  
Ring  
Tip  
Ring  
Sleeve  
SLEEVE RING TIP  
TIP RING SLEEVE  
Sleeve  
1
2
1
2
3
3
Tip  
1
2
3
Ring  
TIP RING SLEEVE  
Sleeve  
Unbalanced  
Tip  
1
2
3
Ring  
Sleeve  
TIP RING SLEEVE  
Tip  
1
2
3
Sleeve  
TIP SLEEVE  
1
2
3
Centre  
Screen  
Tip  
Tip  
TIP SLEEVE  
SLEEVE TIP  
Sleeve  
Sleeve  
Tip  
Tip  
Ring  
Ring  
TIP RING SLEEVE  
SLEEVE RING TIP  
Sleeve  
Sleeve  
Tip  
Centre  
Screen  
Sleeve  
TIP SLEEVE  
Tip  
Centre  
Screen  
Ring  
Sleeve  
TIP RING SLEEVE  
1
2
1
2
3
3
- Insert Points Connection  
If you are connecting to a mixing console's main inserts, you may have a single TRS jack for Send & Return, in  
this case, use an insert "Y" cable that configured like the examples below.  
1/4" TRS insert  
Send  
Return  
Tip  
Ring  
Sleeve  
Insert Leads  
Tip (Send)  
Sleeve  
Tip  
Ring  
SLEEVE TIP  
Sleeve  
Tip (Return)  
Sleeve  
TIP RING SLEEVE  
SLEEVE RING TIP  
1
2 (Send)  
3
Tip  
Ring  
1
Sleeve  
2 (Return)  
TIP RING SLEEVE  
3
Centre (Send)  
Screen  
Tip  
Ring  
Sleeve  
Centre (Return)  
Screen  
TIP RING SLEEVE  
4.3 Rack Mounting  
The most secure mounting is on a universal rack shelf available from various rack manufactures or your music  
dealer. The 5-Band Parametric Equalizer fit 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 5-Band Parametric Equalizer on high  
temperature devices such as power amplifiers etc. to avoid overheating.  
7
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5. APPLICATION  
5.1 The Frequency Range of music Instruments  
Please look at the following table. It gives you an idea of the frequency coverage of the main musical instru-  
ments and the human voice. Select a specific instrument and start to "play" with your LTO-Q applying the  
five bands available on the covered frequencies. Adjust GAIN first and then FREQUENCY and finally Q.  
See how much control your LTO-Q will give you allowing a perfect contour of your sound.  
Mid C  
CDEFGABCDEFGABCDEFGABCDEFGABCDEFGABCDEFGABCDEFGABCDEFGABCDEFGABC  
25 31 40 50 62 80 100 125 160 200 250 320 400 500 640 800 1K 1.3K1.6K 2K 2.5K 3.1K 4K 5K 6.2K 8K 10K 13K 16K 20K  
Human hearing range  
VOCAL  
Soprano  
Contralto  
Baritone  
Bass  
WOODWIND  
Piccolo  
Flute  
Oboe  
Clarinet in B flat or A  
Clarinet in E flat  
Bass Clarinet  
Basset Hom  
Cor Anglais  
Bassoon  
Double Bassoon  
BRASS  
Soprano Saxophone  
Alto Saxophone  
Tenor Saxophone  
Baritone Saxophone  
Bass Saxophone  
Trumpet in C  
Trumpet in F  
Alto Trombone  
Tenor Trombone  
Bass Trombone  
Tuba  
Valve Hom  
STRINGS  
Violin  
Viola  
Cello  
Double Bass  
Guitar  
KEYBOARDS  
Pianoforte  
Organ  
PERCUSSION  
Celesta  
Timpani  
Xylophone  
FREQUENCY  
25 31 40 50 62 80 100 125 160 200 250 320 400 500 640 800 1K 1.3K1.6K 2K 2.5K 3.1K 4K 5K 6.2K 8K 10K 13K 16K 20K  
8
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5.2 Using your LTO-Q in a sound reinforcement system  
You can successfully use your LTO-Q in a sound reinforcement system in order to:  
Cut out undesirable frequencies such as tape hiss and/or floor rumble.  
Create sounds effects enlarging the stereo image.  
Eliminate feedback using very sharp Q control on selected frequencies.  
Overboost or overattenuate selected frequencies thanks to the overlapping frequency range of the five bands  
available.  
5.3 Application on single instrument  
If you wish to use your LTO-Q as an "in line" processor and use it for single instrument equalisation, you must  
connect the output of the instrument to the input of your LTO-Q and the output of the LTO-Q to the input of  
an amplifier.  
AC INPUT  
1 1 0 - 1 2 0 V  
TIP  
/
SLEEVE  
/
RING  
PIN  
2
PIN3  
TIP  
/
SLEEVE  
/
RING  
PIN  
2
PIN3  
95-120V /210-240V 60-50Hz  
Rated Power Consumption 9W  
/
PIN  
1
/
PIN  
1
220-240V  
FUSE:  
NEW TIDE  
3
NEW TIDE  
3
210-240V: T200mAL 250VAC  
95-120V: T315mA 250VAC  
REPLACE FUSE WITH CORRECT TYPE ONLY  
2
1
2
1
Apparaten skall anslutas till  
jordat uttag nar den ansluts  
till ett natverk  
A101  
OUTPUT  
INPUT  
Input  
Main Output  
MIC level signal  
Stereo Program Source  
5.4 Application on main MIX  
Follow this chart and you will use the total flexibility of your LTO-Q on the Main Mix.  
AC INPUT  
1 1 0 - 1 2 0 V  
TIP  
/
SLEEVE  
/
RING  
PIN  
2
PIN3  
TIP  
/
SLEEVE  
/
RING  
PIN  
2
PIN3  
95-120V /210-240V 60-50Hz  
Rated Power Consumption 9W  
/
PIN  
1
/
PIN  
1
220-240V  
FUSE:  
NEW TIDE  
3
NEW TIDE  
3
210-240V: T200mAL 250VAC  
95-120V: T315mA 250VAC  
REPLACE FUSE WITH CORRECT TYPE ONLY  
2
1
2
1
Apparaten skall anslutas till  
jordat uttag nar den ansluts  
till ett natverk  
A101  
OUTPUT  
INPUT  
Main Output  
Insert  
MIC level signal  
9
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6. TECHNICAL SPECIFICATIONS  
AUDIO INPUT  
Type  
Active balanced XLR and 1/4" JACK  
Balanced: 50kOhm Unbalanced: 25kOhm  
+4dBu/ 10dBV  
Impedance  
Operating level  
Maximum input level  
Balanced and Unbalanced: +18dBV  
>55dB @1kHz  
CMRR  
AUDIO OUTPUT  
Type  
XLR and 1/4" JACK  
Impedance  
Balanced: 60Ohm Unbalanced: 30Ohm  
+18dBV  
Maximum output level  
SYSTEM SPECIFICATIONS  
Bandwidth  
THD+N%  
18Hz to 30kHz at 3dBV  
0.02% typ. 1kHz, @+4dBu  
0.04% typ. 1kHz, @ 10dBu  
0.01% typ  
IMD  
>-92dBr unweighted 22Hz to 22kHz  
18Hz to 28kHz, 3dB  
Noise  
Frequency response  
Variable (10Hz to 400Hz)  
Low cut  
High cut  
Variable (2.5kHz to 30kHz)  
PARAMETRIC FILTER  
Variable ( 15dB)  
Level  
Frequency  
Band1: 20Hz to 400Hz  
Band2: 60Hz to 1kHz  
Band3: 150Hz to 2.5kHz  
Band4: 500Hz to 8kHz  
Band5: 1kHz to 20kHz  
Variable (0.03 to 1.6 octaves)  
Bandwidth  
FUNCTION SWITCHES  
INDICATORS  
Relay controlled hard bypass  
Audio IN/OUT  
I/O meter IN/OUT  
IN/OUT  
Switches the meter display from input to output  
Activates each filter band  
12-segment LED display:  
Input/output level  
Function switch  
Main voltages  
-30/-24/-18/-12/-6/-3/0/+3/+6/+9/+12/+18dB  
LED indicator of every switch  
POWER SUPPLY  
AC: 210 240VAC~50Hz  
AC: 95 120VAC~60Hz  
9watts  
Power consumption  
Fuse  
210 240V: T200mAL 250VAC  
95 120V: T315mA 250VAC  
PHYSICAL  
483(W) 194.1(D) 44(H)mm  
3.23kg  
Dimension  
Weight  
10  
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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 exclu-  
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.  
11  
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SEIKAKU TECHNICAL GROUP LIMITED  
No. 1, Lane 17, Sec. 2, Han Shi W. Road, Taichung, 401 Taiwan  
email: [email protected] 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  
c
manual is allowed without prior written permission.Copyright 2004 Seikaku Technical Group Limited.  
NF00961-1.0  
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