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Nilfisk-ALTO CLE4.0 - page 1
QUAD COMPRESSOR/LIMITER User's Manual LTO R www .altoproaudio.com V ersion 2.0 Dec. 2002 English CLE4.0 ...
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Nilfisk-ALTO CLE4.0 - page 2
1 SAFETY RELA TED 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 T erminal AC mains (Alternating Current) H ...
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Nilfisk-ALTO CLE4.0 - page 3
2 PREF ACE Dear Customer: For our L TO AUDIO TEAM, music and sound are more then 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 L TO line presents unparalleled analogue and digital ...
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Nilfisk-ALTO CLE4.0 - page 4
T ABLE OF CONTENTS 1. INTRODUCTION......................................................................................................................................4 2.1 Some technical stuff 2. THE CONCEPT BEHIND........................................................................................................................4 2.2 V oltage ...
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Nilfisk-ALTO CLE4.0 - page 5
1. INTRODUCTION Y ou are now the Owner of an CLE 4.0 Quad Compressor/Limiter . The CLE 4.0 is a very powerful dynamic LT O processor . We have included in it several innovative circuit designs that make the CLE 4.0 a very versatile processor: smart and fast recognition of the program and very low distortion V oltage Control Amplifier (VCA) Feature ...
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Nilfisk-ALTO CLE4.0 - page 6
5 Chart. 1 The dynamic range capabilities of various devices 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. T ricky uh? There is a very easy way to obtain this. With the volume knob in hand you increase the volume durin ...
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Nilfisk-ALTO CLE4.0 - page 7
6 3. CONTROL ELEMENTS Y our CLE 4.0 presents with four channels. Each channel is equipped with the same control elements: 3 push-button switches, 4 rotary controls and 17 LEDs. Y ou can operate in stereo mode via pressing the Couple switch. The details please refer to following content. 1. Threshold Control for Compressor Section With this control ...
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Nilfisk-ALTO CLE4.0 - page 8
7 9. Threshold Control for Limiter The threshold Level for the Limiter will be adjusted by this control 10. Limiter LED When the Limiter is active, this LED will flash up. 12. V oltage Selector and Fuse holder Please make sure about the voltage available in your Country before connecting the unit to the AC socket. Please consult with a qualified En ...
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Nilfisk-ALTO CLE4.0 - page 9
8 4.1.2 Ratio ontrol C 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 in ...
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Nilfisk-ALTO CLE4.0 - page 10
4.2 The 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 ...
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Nilfisk-ALTO CLE4.0 - page 11
10 b. In Line Connection Please see following drawing for details. 5.3 Rack ounting M The most secure mounting is on a universal rack shelf available from various rack manufactures or your music dealer . The CLE 4.0 Quad Compressor/Limiter fits into one standard 19" rack unit of space. Please allow at least an additional 4" depth for the ...
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Nilfisk-ALTO CLE4.0 - page 12
11 AUDIO INPUT Active balanced XLR and 1/4"JACK Balanced: 50K Ohm Unbalanced: 25K Ohm alanced and nbalanced: B U +21 dBu +21 dBu AUDIO OUTPUT XLR and 1/4" JACK Balanced: 60Ohm Unbalanced: 30Ohm 20Hz to 20KHz at +0,-0.5dB 0.01% typ.1KHz ,@+4dBu 0.04% typ,1KHz ,@+20dBu 0.01% typ >-90dBu <-100dB Interactive Compressor V ariable: from - ...
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Nilfisk-ALTO CLE4.0 - page 13
11 7. W ARRANTY 1. W ARRANTY REGISTRA TION CARD T o obtain Warranty Service, the buyer should first fill out and return the enclosed W arranty Registration Card within 10 days of the Purchase Date. All the information presented in this W arranty Registration Card gives the manufacturer a better understanding of the sales status, so as to purport a ...
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Nilfisk-ALTO CLE4.0 - page 14
SEKAKU ELECTRON IND. CO., L TD NO.1, LANE 17, SEC. 2, HAN SHI WEST ROAD, T AICHUNG, 401 T AIWAN http://www .altoproaudio.com T el:886-4-22313737 email: alto@altoproaudio.com Fax:886-4-22346757 All rights reserved to AL TO. All features and content might be changed without prior notice. Any photocopy , translation, or reproduction of part of this ma ...
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