User's Manual CLE8.0 COMPRESSOR /LIMITER /GATE R LTO www.altoproaudio.com Version 2.1 Dec.
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. SAFETY RELATED SYMBOLS CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN Protective Ground This symbol, wherever used, alerts you to the presence of un-insulated and dangerous voltages within the product enclosure. These are voltages that may be sufficient to constitute the risk of electric shock or death.
PREFACE Dear Customer: Thanks for choosing LTO CLE 8.0 Compressor/Limter/Gate and thanks for choosing one of the results of AUDIO TEAM job and researches. LTO 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.
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..............................................................................................................
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).
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.
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 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.
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.
3.3 Compressor Section 12 4 -30 -40 +20 70 0.3 1 1.5 0.1 10 6 +10 2 0 0.5 30 15 150 1 COMPRESSOR(dB) RATIO(N:1) ATTACK(mSec) 11 13 14 0.05 5 AUTO RELEASE(dB/Sec) 16 +10 3 -10 15 -20 +20 OUTPUT GAIN(dB) 17 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.
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.
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.
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.
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.
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 Ring + Tip Tip Ring Sleeve Sleeve TS Type Unbalanced Sleeve 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 b. In Line Connection Please see following drawing for details.
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.
6. TECHNICAL SPECIFICATIONS INPUT Type Impedance Operating level Max input level CMRR Active balanced XLR and 1/4"JACK Balanced >50KOhm, Unbalanced>25KOhm +4dBu/ 10dBV +21dBu balanced and unbalanced Typically>55dB at 1KHz Type Impedance Max output level XLR and 1/4" JACK Balanced 60 Ohm, Unbalanced 30 Ohm >+21dBu Type Impedance Max input level 1/4" JACK >10KOhm >+24dBu Type Impedance Max output level 1/4" JACK 2KOhm >+21dBu Bandwidth Noise THD IMD Crosstalk 20HZ to 20kHz, +0/ 0.
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. Changes the internal reference level from +4 dBu to 10dBu. Linking both channels for stereo operation. Channel 1 becomes master.
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.
SEIKAKU TECHNICAL GROUP LIMITED No. 1, Lane 17, Sec. 2, Han Shi W. Road, Taichung, 401 Taiwan http://www.altomobile.com Tel: 886-4-22313737 email: info@altomobile.com 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 manual is allowed without prior written permission.
