CN-220 OWNERS MANUAL COMPRESSOR/NOISE GATE. EQUIPOS EUROPEOS ELECTRÓNICOS, S.A.L Avda. de la Industria, TRES CANTOS-MADRID (SPAIN). - PDF

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CN-220 COMPRESSOR/NOISE GATE OWNERS MANUAL EQUIPOS EUROPEOS ELECTRÓNICOS, S.A.L Avda. de la Industria, TRES CANTOS-MADRID (SPAIN)

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CN-220 COMPRESSOR/NOISE GATE OWNERS MANUAL EQUIPOS EUROPEOS ELECTRÓNICOS, S.A.L Avda. de la Industria, TRES CANTOS-MADRID (SPAIN) 2 1. INTRODUCTION SWITCHES, CONTROLS, ADJUSTMENTS AND CONNECTORS...4 FRONT PANEL...4 REAR PANEL WORKING PRECAUTIONS INSTALLATION...6 UNPACKING...6 MOUNTING...6 CHANGING THE VOLTAGE AND THE FUSE...6 CONNECTING TO THE MAINS... 7 INPUT CONNECTION... 7 UNBALANCED INPUT...8 BALANCED INPUT...9 OUTPUT CONNECTION...9 UNBALANCED OUTPUT BALANCED INPUT GROUND LINK OPERATION NOISE GATE TEST MONITOR SWITCH (SIDE TEST) ACTIVITY LED s (SHUT OPEN) HP AND LP KEY FILTER CONTROLS THRESHOLD CONTROL ATTACK TIME SWITCH RELEASE TIME CONTROL RANGE SWITCH BYPASS SWITCH COMPRESSOR BAND COMPRESSOR CONTROL AND SWITCH THRESHOLD CONTROL COMPRESSION RATIO CONTROL GAIN REDUCTION VUMETER BYPASS SWITCH COMMON OUTPUT LEVEL CONTROL OUTPUT LEVEL VU-METER STEREO SWITCH SIDE CHAIN CONNECTOR OPTIONS SECURITY COVER (TP-1) KEY LOCKED SECURITY COVER (TS-1) BLOCK DIAGRAM AND HOW IT WORKS REPAIR GUIDE APPLICATION EXAMPLES SUPPRESSING CROSSTALK IN MULTI-MIC APPLICATIONS GATING DRUMS REDUCING BACKGROUND NOISE REDUCING FEEDBACK IN MICROPHONES WITH HIGH COMPRESSION...20 LEVEL VARIATIONS IN VOICES AND INSTRUMENTS...20 RECORDINGS...20 SPEAKER PROTECTION...20 PRODUCING THE TALKOVER EFFECT INCREASING THE OUTPUT LEVEL OF A MIXING SIGNAL SOUND PRESSURE LEVEL CONTROL SELECTIVE SOUND PRESSURE LEVEL CONTROL...22 TIME CONTROL TECHNICAL SPECIFICATIONS WARRANTY...24 3 1. INTRODUCTION Congratulations on your purchase of the ALTAIR compressor/noise gate CN-220. Our dilated experience in the design and manufacture of effect processing equipment, had led to us to carry out this compressor/noise gate of great performances. There is a lot the characteristics that make of the ALTAIR CN-220, one of the most highlighted of the audio professional market, here enumerated some: The ALTAIR CN-220 incorporates in a compact unit, a Dual Compressor-Limiter with a full-featured Noise Gate front end. Dedicated filters are provided in the Gate section to Trigger the gate, only by the desired instrument, avoiding false gating. Test monitoring of the filtered signal is available to set-up the gate effect. Front panel Attack and Release time parameters are provided for optimal sound reconstruction or special effects creations. Background stage noises are easily removed without signal degradation, enhancing instrument control and mixing operation. Special attention has been taken to provide the professionals with a general purpose device. Specs such as +24 dbu (max) Input/Output level operation and extremely low output noise guarantee a broad range of audio industry applications. Additional features include a Band Compressor mode with adjustable frequency selection to achieve a variety of effects as De-Essing, Vocal Stopping, Drum Levelling, etc by compressing only the desired band without altering the whole audio spectrum. Electric Bass guitar sounds, for example, become more natural as the harmonic contents are unaltered when Slap Bass playing. Full specs, full features take the Altair CN-220 a step further in Audio Dynamic Processing. Naturally, you want to use your compressor/noise gate, but before beginning is important that you read this manual. This manual will help you to install and use your new compressor/noise gate. It is very important that you read it carefully, mainly the paragraphs marked as NOTE, PRECAUTION and DANGER, for your security. Save the original packing, you can re-use it to transport the unit. NEVER SHIP THE ALTAIR CN-220 WITHOUT IT'S ORIGINAL PACKING. 4 DUAL/STEREO COMPRESSOR/NOISE GATE CN SWITCHES, CONTROLS, ADJUSTMENTS AND CONNECTORS These are the switches, controls, adjustments and connectors that you could find in your ALTAIR compressor/noise gate. The description and explanation of each one of them, you will find in the corresponding section. FRONT PANEL TEST MONITOR SWITCH. ACTIVITY LED s. HP AND LP KEY FILTER CONTROLS. THRESHOLD CONTROL. BAND COMPRESSOR CONTROL AND SWITCH. THRESHOLD CONTROL. BYPASS SWITCH. COMPRESSION RATIO CONTROL. ATTACK TIME SWITCH. GAIN REDUCTION VU-METER. RELEASE TIME CONTROL. OUTPUT LEVEL CONTROL. POWER SWITCH. RANGE SWITCH. OUTPUT LEVEL VU-METER. COMMON NOISE GATE SECTION COMPRESSOR SECTION BYPASS SWITCH. STEREO/DUAL SWITCH. REAR PANEL DUAL/STEREO COMPRESSOR/NOISE GATE CN-220 MAINS CONNECTOR, FUSE HOLDER AND VOLTAGE SELECTOR. EARTH LINK SWITCH. OUTPUT SIGNAL CONNECTORS, XLR-3-32 AND JACK ¼. SIDE CHAIN CONNECTOR, JACK ¼. INPUT SIGNAL CONNECTORS, XLR-3-31 AND JACK ¼. 5 3. WORKING PRECAUTIONS DUAL/STEREO COMPRESSOR/NOISE GATE CN The manufacturer is not responsible of any damage occurred in the compressor/noise gate unit outside the limits of the warranty or those produced by not keeping in mind the working precautions. Mains voltage must be correct and the same as that setting on the rear of the unit voltage switch. Damage caused by connection to improper AC voltage is not covered by any warranty. DANGER: Inside the unit there are high voltages, doesn't open it. The unit doesn't contain elements that could be repaired by the user. Whenever the compressor/noise gate unit is connected to the mains, contains elements with high voltages. In order to disconnect the unit completely, you must disconnect it of the mains. CAUTION: Protect the compressor/noise gate from the rain and moisture. Ensure that no objects or liquids enter it. If liquid is spilled into the unit, disconnect it from the mains and consult a qualified service technician. Don't place the unit close to heat sources. 4. INSTALLATION UNPACKING Before leaving from factory, each compressor/noise gate was carefully inspected and tested. Unpack and inspect the unit for any damage that may have occurred during shipment. If any damage is found, doesn't connect the unit to the mains, notify the salesperson immediately, because a qualified service technician must inspect the unit. Save the original packing, you could use if you need to transport the unit. NEVER SHIP THE COMPRESSOR/NOISE GATE WITHOUT IT'S ORIGINAL PACKING. MOUNTING It is always advisable to mount the unit in rack, either for mobile or fixed installations, for protection, safety, aesthetics, etc. The ALTAIR CN-220 is designed for standard 19 rack mounting, and occupy 1u high rack space. CHANGING THE VOLTAGE AND THE FUSE The compressor/noise gate unit is set to operate at 230V, 50-60Hz and at 115V, 50-60Hz. Make sure that the unit is disconnected of the mains. In the unit rear panel, is placed the mains connector, the mains selector and the fuse holder. The box bellow this mains connector is called fuse holder + mains selector. Take out the fuse holder + mains selector. Upon extracting the fuse holder, the fuse will appear, take out it and change for the new one. Insert the fuse holder into the mains connector again, without spin it (make sure that the voltage to which it is going to connect the unit remains indicated in normal position, not inverted), if you only wants to change the fuse. If what you want are change the mains voltage, rotate the fuseholder until remains the mains voltage to which it is going to connect the unit in normal position, not inverted. 7 Compressor/noise gate set up to 115 V. Compressor/noise gate set up to 230 V. Make sure that the fuse is the right one for the selected voltage: FUSE (230V Hz) T0,5A. FUSE (115V Hz) T1A. NOTE: The fuseholder provide a place for spare fuse. CAUTION: Always make sure upon changing the fuse, that this is the adequate for the selected mains voltage (T1A for 115V and T0,5A for 230V). CONNECTING TO THE MAINS The connection of the compressor/noise gate power supply to the mains takes place by a standard cord included in the box. Make sure that the unit power switch is at 0 position (turned off). Insert the female I.E.C. connector of the tripolar cable into the unit power supply male connector, placed at the rear panel. Insert the male connector of the tripolar cable into the mains plug. Turn on the unit power switch. In that moment the ACTIVITY LED indicator (red or green) of the noise gate section will light, indicating that the unit is turned on. CAUTION: Make sure that the mains voltage is the correct as well as their fuse is the adequate. INPUT CONNECTION The compressor/noise gate input signals is carried out through two XLR-3-31 female connectors and two JACK ¼ wired internally in parallel mode, one per each channel. The input connections are balanced, with a nominal impedance of 10 KΩ (5 KΩ unbalanced). The next list shows the input pins correspondence as A.E.S recommendation practice: XLR-3-31 JACK ¼ PIN 1 0 V TIP HOT (+) PIN 2 HOT (+) RING COLD (-) PIN 3 COLD (-) SLEEVE 0 V 8 TIP. RING. SLEEVE. The input connection depends on two factors, the first is the type of input signal balanced or unbalanced, and the second the ground configuration of the sound source (floating or groundreferenced). The next pictures shows some of the different possibilities of connection, relying on the type of input signal, balanced or unbalanced and according to the ground configuration of the equipment (floating or ground-referenced). In the next diagrams, we use the following symbols: Sound source with mains cord without ground connection. Sound source with mains cord with ground connection. UNBALANCED INPUT Sound source with the EARTH-LINK OFF. Sound source with the EARTH LINK ON. This type of connection will be used when the sound source doesn't provide balanced output. When possible, employ the connection type 1. 1) Using twin-lead shielded cable: 9 2) Using single conductor shielded cable: BALANCED INPUT OUTPUT CONNECTION 10 The compressor/noise gate output signal is carried out through two XLR-3-32 male connectors and two JACK ¼ wired internally in parallel mode, one per each channel. The outputs are balanced, with a nominal impedance of 100 Ω. The next list shows the input pins correspondence as A.E.S recommendation practice: XLR-3-32 JACK ¼ PIN 1 0 V TIP HOT (+) PIN 2 HOT (+) RING COLD (-) PIN 3 COLD (-) SLEEVE 0 V TIP. RING. SLEEVE. The output connection depends on two factors, the first is the type of input signal balanced or unbalanced, and the second the ground configuration of the sound destination unit (floating or ground-referenced). The next pictures shows some of the different possibilities of connection, relying on the type of output signal, balanced or unbalanced and according to the ground configuration of the equipment (floating or ground-referenced). In the next diagrams, we use the following symbols: Sound destination unit with mains cord without ground connection. Sound destination unit with mains cord with ground connection. UNBALANCED OUTPUT Sound destination unit with the EARTH-LINK OFF. Sound destination unit with the EARTH LINK ON. This type of connection will be used when the sound destination unit doesn't provide a balanced input. When possible, employ the connection type 1. 1) Using twin-lead shielded cable: 11 2) Using single conductor shielded cable: BALANCED INPUT GROUND LINK In some installations, it might be necessary to isolate the compressor/noise gate electric ground, from the system mains earth, in order to avoid ground loops that could generate 12 unwanted noises. For this reason, the unit provides an EARTH-LINK switch placed at the rear panel in order to lift the mains earth from the unit. MAINS EARTH LINKED WITH THE COMPRESSOR/NOISE GATE ELECTRIC GROUND. MAINS EARTH LIFTED FROM THE COMPRESSOR/NOISE GATE ELECTRIC GROUND. NOTE: For security reasons, the earth connection to the mains is linked with the unit chassis in both cases. CAUTION: Always operate the unit with the AC ground wire connected to the electrical system ground. Precautions should be taken so that the means of grounding of a piece of equipment is not defeated. For this circumstance, NEVER lift the mains earth AC ground to avoid possible accidents. For your security, NEVER use ground isolator adapters; instead it is recommended the EARTH -LINK switch. 5. OPERATION The dynamic range of an audio equipment is limited by the maximum signal level that the audio equipment can drain without audible distortion and the noise generated by this audio equipment. The noise, is generated by the audio equipment because of the current flowing the conductors, due to the random electron movements. For statistical reasons, this produces frequencies within the whole audio spectrum. This noise is called white noise. If this noise is then strongly amplified, a noise will be obtained perfectly audible. The maximum signal level of the audio equipment is limited by the levels of the internal operating voltages. If the signal exceeded the internal operating voltages, audible signal distortion is the result. In practice, this limitation is greater, since a certain reserve must be maintained to avoid distortion of the audio signal if sudden level peak occur. In technical words, we refer to this reserve as headroom. If we reduce the input signal level, we reduce the risk of signal distortion due to level peeks, however, at the same time, the noise floor level will be increased if we want obtain the same output signal level, since, we must amplify more. The compressor/limiter act as automatic gain controls, decreasing the signal level above a certain level (THRESHOLD), restricting the dynamic range and allowing us increase the audio equipment headroom, without decrease the input signal level. The difference between a compressor and a limiter, is that limiters abruptly limit the signal above the threshold while the compressors will decrease the signal level above the threshold, depend on the compression ratio set up and the ratio of the input signal level and the threshold, it s to say, gradually. How we explained previously, the noise limits the audio equipment dynamic range. The noise gates decrease the signal gain abruptly bellow the threshold allowing increase the audio equipment dynamic range, achieving the inverse function of a compressor/limiter. The ALTAIR CN-220 incorporates a dual Compressor-Limiter with a full-featured Noise Gate connected internally. NOISE GATE TEST MONITOR SWITCH (SIDE TEST) 13 The side test switch, allow monitor the output signal obtained after the key filters to set up by ear the signal that we want to open the noise gate. It is a push button, because of that upon releasing it, the noise gate will return to its normal state. This switch will be used only during the sound check since it disables the compressor and noise gate effect. NOTE: The SIDE TEST switch, connect directly the key filters output with the unit output. Therefore, disable the compressor section, and the noise gate BYPASS switch. STEREO: In stereo mode at the channel 2, this switch monitor the output signal obtained after the channel 2 key filters, but the noise gate trigger with the signal obtained of the channel 1 and channel 2 key filters average. ACTIVITY LED s (SHUT OPEN) The activity LED s show the noise gate operation. The SHUT red LED indicate that the key filters signal level output, which trigger the noise gate, is bellow the threshold set up. The other OPEN green LED report that the key filters signal level output, which trigger the noise gate, is above the threshold set up. If the BYPASS switch is not depressed, when the SHUT red LED light, the noise gate will be decreasing the input signal gain, and when the OPEN green LED light, the signal will pass unchanged through the noise gate. STEREO: In stereo mode, the channel 2 activity LED s, won t indicate the channel 2 noise gate operation. The channel 1 activity LED s will indicate the operation of both noise gates. HP AND LP KEY FILTER CONTROLS The lateral filters, filter the signal that will arrive to the noise gate detector, allowing to trigger the noise gate only with the desired instrument, or with the wanted bandwidth, avoiding false gating. The high pass filter (HP) can vary between 30 Hz to 4 KHz, and the low pass filter can vary between 200 Hz and 20 KHz, allowing an adjustment in all the audible band STEREO: Like starting point, it is convenient adjust both filters of both channels (channel 1 and 2) with the same settings since the control on both channels is obtained by the two signals trigger average. THRESHOLD CONTROL The threshold control allows set up the level above the signal will pass unchanged through the noise gate. If the level is bellow this threshold, the noise gate will be decreasing the input signal gain. The threshold control can vary between 50 and +20 dbu. ATTACK TIME SWITCH The noise gate attack time is defined, as the delay in the noise gate opening (allow to pass the signal unchanged) when a signal rise above the threshold level set up. With the ATTACK switch depressed, the noise gate attack time will be configured in AUTO mode. In this mode, the noise gate detector adapts the attack time to the input program content, allowing an easy and quick noise gate adjustment on the part of the user. 14 With the ATTACK switch pressed, the noise gate attack time will be configured in FAST mode. In this mode, the attack time is very fast, saving the signal rise edge. Therefore, in this mode the noise gate adjustment is more difficult. RELEASE TIME CONTROL The noise gate hold time is defined as the delay in the noise gate closing (decreasing the input signal gain) when a signal drop the threshold level set up. The release time begins after the hold time, and ends when the gain reduction adjusted with the RANGE switch is achieved. The release time control adjust the noise gate release time between 10 msg and 2 sg, and at the same time set up a hold time according with the release time adjustment. RANGE SWITCH The range switch determines the amount of gain reduction produced in the program signal when the noise gate is close. With this switch depressed, the program gain reduction will be 80 db, and with this switch pressed, the program gain reduction will be 20 db. In most of the applications, it is preferable use the 20 db range, that although it don't produce a total gate, and introduce less adverse effects when signals with much noise floor are processed. BYPASS SWITCH When we press this noise gate bypass switch, the noise gate will be disabled and the controls and switched won t be operative. The activity LED s continue working indicating our set up, but the program signal will pass unchanged through the noise gate. COMPRESSOR BAND COMPRESSOR CONTROL AND SWITCH When the band compressor is active, it s to say, with the ON switch pressed, the compressor stops compressing in the whole audio spectrum, in order to only compress in the selected band. With the ON switch depresses, the compressor work normally (in the whole audio spectrum). The band compressor control, allow to configure the selected band from 80 Hz to 10 KHz. Configured the band compressor control between 5 KHz and 10 KHz works like DE-ESSER, it allow to reduce notably the sibilance effect that takes place with the treatment of vocals with a great content in high frequencies, mainly with the letter s. In band compressor mode, the compression ratio and the threshold adjusts continues working. STEREO: In stereo mode, any of the ON switches will put both compressors in band compressor mode, however, the band compressor control will be independent in both channels, for that if you want that the band compressors work symmetrical, both controls will placed at the same position. THRESHOLD CONTROL The threshold control sets the level where compression will begin. The signals below the level defined at the threshold control will pass unchanged and 15 the signals above the level defined at the threshold control will be compressed in correspondence with the compression ratio control adjustment. The threshold range control varies from -40 to +20 dbu. COMPRESSION RATIO CONTROL The compression ratio controls the amount of compression, which will happ
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