Nilfisk ALTO Air Compressor CLE80 User Manual

User's Manual  
COMPRESSOR /LIMITER /GATE  
CLE8.0  
R
Version 2.1 Dec. 2002  
English  
 
PREFACE  
Dear Customer:  
Thanks for choosing LTO CLE 8.0 Compressor/Limter/Gate 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  
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 CLE 8.0 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: intelligent program recognition, smart  
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 CLE 8.0 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 Master Control Section  
3.2 Expander / Gate Section  
3.3 Compressor Section  
3.4 Peak Limiter Section  
3.5 The Rear Panel  
4. READY TO ROLL?.................................................................................................................................10  
4.1 Expander/Gate Section  
4.2 Compressor Section  
4.3 Peak Limiter Section  
5. INSTALLATION AND CONNECTION.....................................................................................................12  
5.1 Mains Connection  
5.2 Audio Connection  
5.3 Rack Mounting  
6. TECHNICAL SPECIFICATIONS .................................................................................................................................15  
7. WARRANTY ...............................................................................................................................................................17  
3
 
1. INTRODUCTION  
You are now the Owner of an LTO CLE 8.0 Compressor/Limiter/Gate. The CLE 8.0 is a very powerful dynamic processor.  
We have included in it several innovative circuit designs that make the CLE 8.0 a very versatile processor: smart and fast  
recognition of the program, adjustable Expander/Gate and very low distortion Voltage Control Amplifier (VCA).  
Feature List:  
Smart Knee Control Compressor (SKC)  
Soft knee or hard knee? This is the question! SKC combines both: In the "soft knee" mode you control the program  
material so that the compression will be the most musical and inaudible. ON the other end, the hard knee function  
is used for better precision, limiting signal peaks with precision and will allow you to add creativity to the dynamic  
processing. This function also allows you to protect other equipment in the signal loop against distortion.  
The AUTO Function  
Your CLE 8.0 includes AUTO function switch on the front panel. Thanks to the AUTO function attack and release  
times of the program materials are automatically analysed. Then the dynamic range of the program is heavily com-  
pressed in a very musical way so that there will not be any audible breathing or pumping effect.  
Attack and Release Controls:  
Ok,Ok, you do not want to get advantage of our AUTO function and be the Master of your own mix.  
We have provided your CLE 8.0 with User Adjustable attack and release time for the best total manual control.  
Smart Ratio Control expander (SRC)  
During music pauses or when a quiet session occurs, the noise floor maybe highly amplified and this effect may  
be exaggerated because of inappropriate use of the expansion ratio. The SRC control will adjust the expansion  
depending on the input signal so that those signals, which are slightly above the noise floor level, will get the major  
benefits.  
Smart Gain Control peak limiter (SGC)  
This function includes two important functions: Clipper and program limiter. The peak limiter will be activated  
above a certain threshold that is adjusted by the User and will radically restrict signal peaks. But what about  
if the threshold of the Limiter is surpassed only for a few milliseconds? SGC will turn on automatically and  
reduce the output signal so that you will not hear any distortion. Smart, isn't it? The SGC proves to be very  
efficient in loudspeaker protection and to reduce undesired peaks in digital situations.  
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 dy-  
namic 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!  
4
 
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 usu-  
ally set at 10-20dB. 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.  
Chart.1: The dynamic range capabilities of various devices  
Clipping Aera  
Clipping Signal heavily distrorted  
Noise Aera  
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.  
Thriky uh?  
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 sig-  
nal 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. So, the name of this device is "Compressor/limiter".  
2.1.3 More technical stuff about Compressor/Limiters  
Try to measure the dynamic range of musical instruments. You will find out that your ear will handle such  
range during which the distortion and overloading will be generated in your audio equipment.  
To avoid these, compressor/Limiters will be used. Both Compressors and Limiters more or less do the same  
job but Limiters brutally limit the audio signal above a set threshold, while Compressors handle signal in a  
much more civilised way and over a wide range of levels. If an audio signal exceeds the threshold set by  
the User the limiter will kill any audio signal above that threshold. Period! Also Compressors perform their  
function when the audio signal exceed a certain threshold but the signal is not killed brutally. The audio signal  
will be reduced in gain in proportion with the amount above the set threshold.  
5
 
2.1.4 More about noise: Expanders and Noise-Gates  
A lot of instruments such as microphones, amplifiers, guitar pickups, etc generate some noise, either at low fre-  
quencies (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 continuously 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 CLE 8.0 and it is one of the best components available today in his category thanks to its exce-  
llent performances in terms of distortion, linearity, noise and temperature stability  
2.3 Inputs  
2.3.1 Take it easy: Balanced Inputs  
To make your life easy and clean we have provided CLE 8.0 with electronically balanced inputs. Even if you  
operate at high signal levels, hum and noise will be reduce automatically. There is also a servo-function that  
will automatically adjust the internal level when unbalanced connectors are detected. The correction if of 6dB  
and it will avoid differences in level in between input and output signal.  
3. CONTROLS  
SMART  
SMART  
SMART  
SMART  
SMART  
SMART  
SMART  
SMART  
Pic.1: Front Panel of The CLE8.0  
The CLE 8.0 presents with 8 channels. Each channel is equipped with the same control elements: 6 push-button switches,  
8 rotary controls and 22 LEDs except channel 1 which short of the LINK CH1 push-button only.  
3.1 Master Control Section  
1
2
GAIN REDUCTION(dB)  
IN/OUT LEVEL(dB)  
30  
25  
20  
15  
-6  
10  
0
6
3
1
-24 -18 -12  
+6  
+12 +18  
SMART  
SOFT  
SC FILTER IN/OUT METER BYPASS/COMP  
INPUT  
COMP  
GAIN REDUCTION(dB)  
IN/OUT LEVEL(dB)  
30  
25  
20  
15  
-6  
10  
0
6
3
1
-24 -18 -12  
+6  
+12 +18  
LINK CH1  
LINK ON  
SMART  
SOFT  
SC FILTER IN/OUT METER BYPASS/COMP  
INTPUT  
COMP  
6
4
7
5
3
Pic.2: The Master Control Section  
6
 
1. Gain Reduction Meter  
It indicated the gain reduction. The range displayed is 1 to 30 dB.  
2. Input / Output Level Meter  
It will read the actual Input or Output Level. The range goes from -24dB to +18dB.  
3. Bypass Switch  
This switch simply turns off the correspondent channel. It can also be used to make an A/B comparison in between  
processed and unprocessed signal.  
4. Input / Output Meter Switch  
When the switch is ON the level indicator will read the input level. When it is OFF the level indicator will read  
the output level.  
5. SC Filter switch  
Engaging this switch to insert a Low-cut filter in the sidechain path and thus limits the influence of low frequencies  
on the CLE 8.0's control processes.  
6. Smart switch  
Engaging this button to switch the "Hard Knee" characteristics to SKC (Smart Knee Control). SKC provides a  
compression of the program material and should therefore be used whenever compression should be more or  
less inaudible.  
7. Link CH 1 switch  
Every channel contains the Link CH1 switch except the CH1. Activating this switch will link the corresponding  
channel to CH1, and the CH1 will take control of the corresponding channel.  
3.2 Expander / Gate Section  
10  
2.5  
45  
0
1.5  
7
OFF  
+15  
1.2  
8
EXP/GATE(dB)  
RATIO(1:N)  
9
8
Pic.3: Expander/Gate Section  
8. EXP/GATE control  
This control adjust the threshold level for the Expander / Gate Section in the range of Off to +15dBu. Signals  
below this level cause expansion.  
9. Ratio Control  
This control determines the expansion ratio when the signal drops below the threshold level. The expansion ratio can  
be set from 1:1.2 to 1:8 (Low ratio for Expander application or 1:8 for Gate application).  
10. Threshold LED  
The "+" Led lights up when an audio signal is below the set threshold. The "-" Led lights up in presence of an  
expansion  
7
 
3.3 Compressor Section  
12  
4
30  
0.5  
0
15  
70  
0.3  
0.1  
1.5  
+10  
-30  
+10 2  
10  
6
3
-10  
-40  
+20  
1
1
150  
0.05  
5
-20  
+20  
AUTO  
COMPRESSOR(dB)  
RATIO(N:1)  
ATTACK(mSec)  
RELEASE(dB/Sec)  
OUTPUT GAIN(dB)  
14  
16  
15  
17  
11  
13  
Pic.4: Compressor Section  
11. Compressor Control  
This control adjusts the threshold level for the Compressor section in the range of -40dB to +20dB. The SKC  
(Smart Knee Control) is applied to the audio signal, which is a maximum of 10dB above the set threshold. Above  
such level (10dB) a hard knee compression will be applied.  
12. Compressor LED  
These LED's will show you the state of the input signal in relation to the threshold level. If the input signal  
falls below the set threshold level, the left "-" LED will light up. This means that no signal is being compressed.  
When the input signal reach the set threshold level, the middle LED lights up. This means the compression  
function hasn't been activated. If the input signal rises above the set threshold level, this signal will be com-  
pressed and the "+" LED lights up.  
13. Ratio Control  
The ratio between the input and output level of audio signals exceeding the set threshold level is determined by this  
control. This control is manually adjustable from 1:1 to :1.  
14. Attack Control  
This control determines how fast the compressor is to respond to audio signals that will exceed the set threshold.  
It can be manually adjusted from 1 to 150 milliseconds.  
15. Release Control  
This control determines how fast is the compressor to return to unity gain when the audio signal falls below the set  
threshold level. It can be manually adjusted from 0.05 to 5 seconds.  
16. Auto Switch  
Who needs Attack and release control? Activate this switch and these controls will be deactivated. Attack and release  
controls will be automatically set by the unit depending on the program material.  
17. Output Gain Control  
Through this control you can vary the output signal by a maximum of 20 dB. In this way you can recover a level  
that had been lost because of the compression process.  
3.4 Peak Limiter Section  
19  
+18  
+4  
0
OFF  
PEAK LIMITER  
18  
Pic.5: Peak Limiter Section  
8
 
18. Peak Limiter Control  
The threshold level of the Peak Limiter is adjusted by this control.  
19. Peak Limiter LED  
This Led will light up when the Limiter function is activated.  
3.5 The Rear Panel  
21  
UK / Aust  
240V 50Hz  
Fuse:T315mAL  
AC INPUT  
EUROPE  
210-240V 50Hz  
Fuse:T315mAL  
INPUT  
INPUT  
INPUT  
INPUT  
INPUT  
INPUT  
INPUT  
INPUT  
USA / Canada  
100-120V 60Hz  
Fuse:T630mAL  
RATED POWER CONSUMPTION: 40W  
OUTPUT  
OUTPUT  
OUTPUT  
OUTPUT  
OUTPUT  
OUTPUT  
OUTPUT  
OUTPUT  
Apparaten skall anslutas till  
Jordat uttag nar den ansluts  
Till ett natverk  
f u s e 2 5 a 0 V i t h  
w
o n l y U s e  
OPERATING LEVEL  
OPERATING LEVEL  
OPERATING LEVEL  
OPERATING LEVEL  
OPERATING LEVEL  
OPERATING LEVEL  
OPERATING LEVEL  
OPERATING LEVEL  
4dBu  
10dBV  
4dBu  
10dBV  
4dBu  
10dBV  
4dBu  
10dBV  
4dBu  
10dBV  
4dBu  
10dBV  
4dBu  
10dBV  
4dBu  
10dBV  
RETURN  
SEND  
RETURN  
SEND  
RETURN  
SEND  
RETURN  
SEND  
RETURN  
SEND  
RETURN  
SEND  
RETURN  
SEND  
RETURN  
SEND  
CHANNEL 8  
CHANNEL 7  
CHANNEL 6  
CHANNEL 5  
CHANNEL 4  
CHANNEL 3  
CHANNEL 2  
CHANNEL 1  
20  
22 23  
25  
24  
Pic.6: Pear Panel Of The CLE8.0  
20. AC Inlet and Fuse Holder  
This connector is used to connect the supplied power cord. Please check the Voltage accepted by the unit and the  
Voltage available from your AC sockets before connecting the unit to the Mains.  
21. Audio In  
These connectors are used to input the signal source. You can input the signal via the balanced 1/4" TRS phone jack  
or XLR connector.  
22. Audio Out  
These connectors are used to output the signal. You can output the signal via the balanced 1/4" TRS phone jack or  
XLR connector.  
23. Operating Level Control  
This control is used to adapt this unit to either the -10dBV home recording operating level or the +4dBu professional  
studio operating level.  
The Input / Output Level Meter (2) is referenced automatically to the selected level, i.e. an optimum operating range  
of the meter will always be ensured.  
24. Send  
Through this 1/4" unbalanced jack the audio signal can be routed to an external processor for sidechain effect.  
25. Return  
The return signal from an external processor will be inputted through this 1/4" jack.  
9
 
4. READY TO ROLL?  
4.1 Expander/Gate Section  
Chart.3: Function of an expander  
As we told you previously in this Manual the downward expander will reduce automatically the level of the audio  
signal when such signal is below a set threshold. So the expander is the opposite of the compressor/limiter. We  
also explained to you how the ratio curve of the expander is flat while a noise gate it is more brutal processor: It  
simply cut-off the entire signal below a certain set threshold. The CLE 8.0 is equipped with a new kind of expander,  
the SRC (Smart Ratio Control). The ratio of the SRC is automatically adjusted according to the audio signal level.  
In fact, conventional expanders could easily cut part of the musical program with unacceptable result: The gain  
changes become audible. We have equipped the SRC with a non-linear ratio curve, which is soft and adjustable  
by the User. Thanks to the SRC low passages close to noise floor level will be processed with a minimum ratio of  
expansion while for signals of reduced level a higher ratio will be used with resultant greater attenuation.  
SRC CURVE  
Chart.4: SRC Curve characteristics of the Adaptive Expander  
4.1.1 EXP/GATE Adjustment  
The EXP/GATE control covers a very wide range and it is efficient with any working level. Turn the threshold control  
fully counterclockwise and the Expander/Gate section will be completely off.  
4.2 Compressor Section  
4.2.1 Another Threshold Control?  
The compressor threshold control sets the point where the input level starts to be reduced. Let's say the level  
is +12dBu and the threshold control is set at +2dBu: In this case up to 10dB can be compressed. If the input  
level is the same and the control is set at -10dBu the maximum compression will be 22dB, The operating range  
of the threshold control is -40 to +20dBu. Turn the threshold control fully clockwise and you will get a threshold  
level of +20dBu.  
You must remember that the degree and the type of compression not only depend by the threshold control but  
also by other controls such as Ratio, Attack and Release.  
4.2.2 Ratio control  
This control sets the change of input level to output level but only for the signals that exceed the threshold. The scale  
of the ratio control on the front panel (calibrated in dB) indicates how much input level is required to increase the  
output level by 1dB. If you have a ratio equal to 1:1 you will get the same level of input and output signal: So, no  
level change.  
10  
 
If you have a ratio of 2:1 this means that for every 2dB increase of the input level (above threshold) you will  
get an increase of output level of 1dB. ON the same way, a ratio of 10:1 means that for every 10dB increase  
of the input level (above threshold) you will get an increase in output level equal to 1dB, and so on.  
You need to be aware that higher ratio settings produce less natural sounds so if you wish a more minute effect  
on the dynamic range of a program you should use a Ratio of 4:1 or lower.  
With the SKC circuit (Smart Knee Control) you can avoid aggressive compression generated by using high  
ratios. How we achieve this? Introducing a "soft knee" curve in the range of up to 10dB above the threshold  
level. Hard Knee compression is then used beyond this range.  
Output  
Gain 0 dB  
Threshold  
Ratio 2:1  
Ratio 4:1  
Hard Knee  
Limiter :1  
SKC Curve  
Input  
Chart.5: SKC characteristic of the compressor section  
4.2.3 Attack control  
The attack time represents the amount of time that passes before the compressor start to lower the output  
level when the signal is above the threshold point. For very fast transients such as drums, handclaps, etc.  
a short attack time will be used. These peaks are consequently carefully regulated by the compressor.  
Sounds of other nature will get advantages if longer attack times are used. Anyway, our advice is always to  
begin the process with longer attack times. Then you can start gradually to reduce the attack time. In the  
CLE 8.0 the attack time can be set in a range of 1 to 150 milliseconds.  
4.2.4 Release Control  
This control determines how much time the compressor needs to get back to normal gain when the audio  
signal falls below the set threshold.  
A too short release time will make the volume to fluctuate and you will experience pumping effect. A too long  
release time will give you pumping and breathing effect especially when you have loud passage followed by  
a quite passage. The release time on CLE 8.0 can be set from 0.05 to 5 seconds.  
4.2.5 Auto switch  
This switch turns off the possibility of manually set the attack and release times. An intelligent program re-  
cognition circuit will automatically set the attack and release times. In such way, undesirable effects such as  
distortion and pumping will be avoided.  
4.2.6 Output control  
This Control is indispensable to compensate the loss of level at output level generated by the gain reduction  
caused by the compression and limiting processing  
4.2.7 Bypass Switch  
This switch simply turns off the processing of the corresponding channel. This is useful to compare quickly  
the processed and unprocessed signal.  
4.2.8 Gain Reduction Meter  
This consists of 8 LED on the front of the CLE 8.0. Through this Led meter you can visualise the amount of  
gain reduction at any given time.  
11  
 
Chart.6: The effect of a compressor can be expressed as the amount  
of gain reduction that is taking place for any given input  
4.3 Peak Limiter Section  
How fast is the compressor to react to a signal which is above the threshold point? This is determined by the attack  
time. A longer attack time is advisable to process low frequencies while shorter attack time is preferable for high  
frequencies. In this way you will avoid undesired dynamic distortion. But what about if you are mixing a program  
with a wide range of frequencies? In this case you should choose a setting that would benefit the low frequency  
better.  
Well, life is not that easy for conventional compressor/limiters. Ok you handle an audio signal made by a wide  
range of frequencies and you have chosen a longer attack time. But, if are using your CLE 8.0 as a limiter the fast  
high frequencies will pass through untouched because the attack time is too slow and such transients could cause  
distortion when the unit is connected to broadcast devices or taper recorders. The solution in CLE 8.0 is represe-  
nted by our Smart Gain Control (SGC) limiter circuit. The curve in bold is the output signal and the dashed curve  
above it is the input signal. The area in between the two is the amount of gain reduction.  
The unit will activate the limiter when the signal exceeds the threshold for more than 15 microseconds. Then 1  
second after that the signal is below threshold again, reduction goes back to 0dB and in this case input and output  
signals are again identical.  
Peak Limiting  
Program Limiting  
Level  
Release  
Threshold  
Input  
Output  
approx. 1 s  
6ms  
20  
15ms  
t/ms  
30  
Chart.7: SGC characteristic of the limiter section  
10  
5. INSTALLATION AND CONNECTION  
5.1 Mains Connection  
You must check the power supply Voltage available in your Country before connecting the unit to the Mains.  
5.2 Audio connection  
The CLE 8.0 Compressor/Limiter/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.  
12  
 
a. Wiring Configuration  
Both types of connectors available on CLE 8.0 can be wired in balanced and unbalanced modes.  
Please see following drawing for details:  
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 (+)  
Pin3 (-)  
(Linked to Pin1 manually,  
Pin2 (+)  
Pin3 (-)  
)
Pin1 (  
)
Pin1 (  
)
XLR Type Unbalanced  
XLR Type Balanced  
b. In Line Connection  
Please see following drawing for details.  
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
13  
 
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  
Tip  
Ring  
Sleeve  
Insert Leads  
Tip (Send)  
Sleeve  
Tip  
Ring  
SLEEVE TIP  
Sleeve  
Tip (Return)  
Sleeve  
TIP RING SLEEVE  
TIP RING SLEEVE  
TIP RING SLEEVE  
SLEEVE RING TIP  
1
2 (Send)  
3
Tip  
Ring  
1
Sleeve  
2 (Return)  
3
Centre (Send)  
Screen  
Tip  
Ring  
Sleeve  
Centre (Return)  
Screen  
5.3 Rack Mounting  
The most secure mounting is on a universal rack shelf available from various rack manufactures or your music  
dealer. The CLE 8.0 Compressor /Limiter /Gate fits into one standard 19" rack unit of space, and its height is 4H.  
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 CLE 8.0 Compressor /Limiter /Gate on  
high temperature devices such as power amplifiers etc. to avoid overheating.  
14  
 
6. TECHNICAL SPECIFICATIONS  
INPUT  
Type  
Active balanced XLR and 1/4"JACK  
Balanced >50KOhm, Unbalanced>25KOhm  
+4dBu/ 10dBV  
Impedance  
Operating level  
Max input level  
+21dBu balanced and unbalanced  
Typically>55dB at 1KHz  
CMRR  
OUTPUT  
Type  
XLR and 1/4" JACK  
Impedance  
Max output level  
Balanced 60 Ohm, Unbalanced 30 Ohm  
>+21dBu  
RETURN  
Type  
1/4" JACK  
>10KOhm  
>+24dBu  
Impedance  
Max input level  
SEND  
Type  
1/4" JACK  
2KOhm  
Impedance  
Max output level  
>+21dBu  
SYSTEM SPECIFICATIONS  
20HZ to 20kHz, +0/ 0.5dB  
Bandwidth  
Noise  
>
90dBu, unweighted, 22Hz to 22kHz  
<0.01% Typical at +4dBu, 1kHz, unity gain  
<0.04% Typical at +20dBu, 1kHz, unity gain  
<0.01% Typical SMPTE  
THD  
IMD  
<
100dB, 22Hz to 22Khz  
Crosstalk  
EXPANDER/GATE SECTION  
COMPRESSOR SECTION  
Type  
Smart Ratio control Expander  
variable (OFF to +15dB)  
variable (1:1.2 to 1:8)  
Threshold  
Ratio  
Type  
Smart Knee control Compressor  
variable ( 40dB to +20dB)  
variable (1:1 to :1)  
Threshold  
Ratio  
variable (Smart knee control)  
variable (1ms to 150ms)  
Threshold Characteristic  
Manual Attack Time  
Manual Release Time  
Auto Attack Time  
Auto Release Time  
Output level  
variable from 0.05s to 5s  
Typical 15ms at 10dB, 5ms at 20dB, 3ms at 30dB  
Program dependent, typical 125dB/s  
variable ( 20dB to +20dB)  
PEAK LIMITER SECTION  
Type  
Smart Gain Control Peak Limiter  
variable (0 to OFF (+22dBu))  
Threshold  
Ratio  
Stage 1 Limiter Type  
:1  
Clipper  
Attack Time  
Release Time  
Stage 2 Limiter Type  
Attack  
"zero"  
"zero"  
Program Limiter  
program dependent, typ. <5ms  
program dependent, typ. 20dB/s  
Release  
15  
 
FUNCTION SWITCHES  
SMART  
SC FILTER  
AUTO  
Enables the "Smart Knee Control" characteristics.  
Allows for frequency dependent processing.  
Enable the automatic and program dependent setting of the Attack  
/Release times, disengaging the manual Attack /Release controls.  
Switches between input and output for the Level Meter.  
Bypass switch.  
I/O METER  
BYPASS  
Changes the internal reference level from +4 dBu to 10dBu.  
Linking both channels for stereo operation. Channel 1 becomes master.  
OPERATING LEVEL  
LINK  
INDICATORS  
8 element LED display: 1/3/6/10/15/20/25/30 dB.  
8 element LED display: -24/-18/-12/-6/0/+6/+12/+18 dB  
GAIN REDUCTION  
INPUT/OUTPUT LEVEL  
Expander/Gate Threshold  
Compressor Threshold  
Peak Limiter Threshold  
Function switch  
2 LED for under "+" and above "  
"
3 LEDs for under "+",Interactive "0" and above "  
1 LED for indication of limiter function.  
LED indicator for each  
"
POWER SUPPLY  
Mains Voltages  
USA/Canada  
U.K./Australia  
Europe  
~120VAC, 60Hz  
~240VAC, 50Hz  
~230VAC, 50Hz  
~100 120VAC  
General Export Model  
~200 240VAC,50 60Hz  
100 120VAC : 630mA (SLOW BLOW)  
Fuse  
200 240VAC : 315mA (SLOW BLOW)  
40Watts  
Standard IEC receptacle  
Power consumption  
Mains Connection  
PHYSICAL  
485.0(W) 233.0(D) 90.0(H)mm  
5.2Kg  
Dimension  
Net Weight  
16  
 
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.  
17  
 
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.  
NF00940-1.0  
 

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