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S C l a s s S i g n a l P r o c e s s o r s
CH 1 GAIN REDUCTION dB LINK CH 2 GAIN REDUCTION dB CH 3 GAIN REDUCTION dB LINK CH 4 GAIN REDUCTION dB
30 24 18 12 6 4 2 1 30 24 18 12 6 4 2 1 30 24 18 12 6 4 2 1 30 24 18 12 6 4 2 1
HIGH HIGH HIGH HIGH
POWER
TRIGGER ATTACK HOLD RELEASE RANGE IN/OUT TRIGGER ATTACK HOLD RELEASE RANGE TRIGGER ATTACK HOLD RELEASE RANGE IN/OUT TRIGGER ATTACK HOLD RELEASE RANGE
+4 20 .25 1 1 40 +4 20 .5 1 1 40 +4 20 .5 1 1 40 +4 20 .5 1 1 40
4 CHANNEL .1 KHz 10 .1 KHz 1
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Safety Instructions Caution: To reduce the hazard of electrical shock, do not CAUTION remove cover or back. FOR CONTINUED PROTECTIO N AGAINST RISK OF FIRE, REPLACE ONL Y W ITH SAME TYPE FUSE No user serviceable parts inside. Please refer all servicing ATT E NTION to qualified personnel. UTILISER UN FUSI B LE DE RECHANGE DE M Ê ME TYPE WAR NING DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE RISK OF ELECTRIC SHOCK AV IS DO NOT OPEN RISQUE DE C HO C E LE C TRONIQUE NE PAS OU V RIR WARNING: To
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Table of Contents Introduction 2 S gate 4 Features 3 Controls and Functions Front Panel Layout 4–5 Rear Panel Layout 4–5 Operating the S gate 4 Setting Up the S gate 4 6 Gating A Signal 7 Using The Filters 8 Using The Ducker 9 Dynamics Processing 101 10–11 Applications 12 System Set-ups 13–14 S gate 4 Connections 15 Block Diagrahm 16 Specifications 17–18 Copyright 2001, Samson Technologies Corp. Printed October, 2001 Samson Technologies Corp. 575 Underhill Blvd. P.O. Box 9031 Syosset,
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Introduction Congratulations on your purchase of the Samson S Gate 4! The S Gate 4 is a four channel Expander/Noise Gate with frequency sensitive triggering, offering unparalleled control and sonic transparency impressing the most critical listeners. Never before have so many features been packed into a single rack space unit with four noise gates - period. The S gate 4 is a powerful tool for live sound and recording, enabling you to clean up your mix by eliminating hums, buzzes, noisy t
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S gate 4 Features GAIN REDUCTION dB GAIN REDUCTION dB GAIN REDUCTION dB GAIN REDUCTION dB CH 1 LINK CH 2 CH 3 LINK CH 4 30 24 18 12 6 4 2 1 30 24 18 12 6 4 2 1 30 24 18 12 6 4 2 1 30 24 18 12 6 4 2 1 HIGH HIGH HIGH HIGH POWER TRIGGER ATTACK HOLD RELEASE RANGE IN/OUT TRIGGER ATTACK HOLD RELEASE RANGE TRIGGER ATTACK HOLD RELEASE RANGE IN/OUT TRIGGER ATTACK HOLD RELEASE RANGE +4 20 .25 1 1 40 +4 20 .5 1 1 40 +4 20 .5 1 1 40 +4 20 .5 1 1 40 KHz 10 KHz 10 KHz 10 KHz 10 4 CHANNEL .1 .1 .1 .1 GATE
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2 S gate 4 Front Panel Layout 1 3 4 5 6 9 10 7 8 11 GAIN REDUCTION dB GAIN REDUCTION dB GAIN REDUCTION dB GAIN REDUCTION dB CH 1 LINK CH CH 2 2 CH 3 LINK CH 4 30 27 24 18 12 6 2 1 30 27 24 18 12 6 2 1 30 27 24 18 12 6 2 1 30 27 24 18 12 6 2 1 HIGH HIGH HIGH HIGH POWER TRIGGER ATTACK HOLD RELEASE RANGE IN/OUT TRIGGER ATTACK HOLD RELEASE RANGE TRIGGER ATTACK HOLD RELEASE RANGE IN/OUT TRIGGER ATTACK HOLD RELEASE RANGE +4 20 .25 1 1 +4 20 .25 1 1 +4 20 .2
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2 S gate 4 Rear Panel Layout 3 1 4 5 6 7 8 9 10 11 CH 1 GAIN REDUCTION dB CH CH 2 2 GAIN REDUCTION dB CH 3 GAIN REDUCTION dB CH 4 GAIN REDUCTION dB LINK LINK 30 27 24 18 12 6 2 1 30 27 24 18 12 6 2 1 30 27 24 18 12 6 2 1 30 27 24 18 12 6 2 1 HIGH HIGH HIGH HIGH POWER TRIGGER ATTACK HOLD RELEASE RANGE IN/OUT TRIGGER ATTACK HOLD RELEASE RANGE TRIGGER ATTACK HOLD RELEASE RANGE IN/OUT TRIGGER ATTACK HOLD RELEASE RANGE +4 20 .25 1 1 40 +4 20 .25 1 1 40 +4 2
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Operating The S gate 4 Whether you are an experienced audio engineer, just starting out, or you just want to experiment, follow the steps below to get going. Further sections in this manual will cover basic dynamics and the associated parameters, sys- tem set-ups and applications for using dynamics processing in recording and live sound applications. SETTING UP THE S gate 4 • Connect one set of inputs and outputs to the Channel 1 connectors on the rear panel. If possible, use your mixer insert
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Operating The S gate 4 GATING A SIGNAL Unwanted noises, buzzes and hisses can be easily removed by using S gate 4. The idea is to have the Gate open only when the sound you want to hear is playing and to mute off and eliminate (Gate closed) the unwanted noises, buzzes and hisses. Below is a step by step example on gating a signal with the S gate 4. A CD with a sample of a snare drum hit with reverb, or a drum machine is a good signal source for the purpose of this test example, however you
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Operating The S gate 4 USING THE FILTERS The S gate 4 employs a DFT (Dual Filter Trigger) circuit which allows you to create an equalization contour on the trigger filter. The DTF is a two-stage, band-pass equalizer on the trigger or side-chain input. The filters are applied to the trigger whether it is derived from the audio input, or by the KEY input. By using the DTF, you can dial in and out the exact frequency range that you want to influence the opening and closing of the gate. This is
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Operating The S gate 4 USING THE DUCKER S gate 4ʼs Ducker feature is a powerful tool for automatically mixing different sound sources. You can use the S gate 4ʼs Ducker when you want one signal to control the level of another channel or channels. One of the most popular examples of using a ducker is when you have a voice-over turn down a music program track. Another example is to have a vocal track turn down a solo track. This is a great way to mix a sax or guitar solo around a vocal impr
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Dynamics Processing 101 To begin to understand dynamics processing, we must first understand what dynamics are. Dynamics, or the dynamic range of a signal or audio device, is the amount of level between the softest and loudest possible out- put. Dynamics processing is applied to a signal to manage the changes in level. Various types of processing units are available to control dynamics including Noise Gates, Expanders, Compressors, Limiters and De-Essers. All of these processes have a uni
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Dynamics Processing 101 - Continued Soft-Knee / Hard-Knee In order to prevent harsh, unnatural envelopes on compressed signals, sophisticated dynamics processors like the S gate 4 feature an SKD (Smart Knee Detector) or automatic knee circuit. The Smart Knee Detector auto- matically switches from Soft-Knee when the signal is less than 10 dB over Threshold, to Hard-Knee when the signal is 10db above Threshold. In Soft-Knee mode, there is a gradual effect on gain change, which begins as the si
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Applications Using the Expander/Gate to Remove Hiss and Noise The S gate 4 is an extremely useful tool in reducing the level of unwanted noises. By using the Expander/Gate you can effectively fade the noise into the noise floor or abruptly turn the unwanted signal completely off. Letʼs say you want to reduce the bleed or cross talk that occurs when different instruments are recorded in close proximity to each other. You have recorded an acoustic guitar simultaneously in the same room as
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S gate 4 System Set-Ups LIVE SOUND SYSTEM WITH GATES ON INDIVIDUAL CHANNELS KEY CH 4 KEY CH 3 KEY CH 2 CH 1 KEY BALANCED BALANCED BALANCED BALANCED OUTPUT OUTPUT OUTPUT OUTPUT INPUT INPUT INPUT INPUT MIC/LINE 1 MIC/LINE 2 MIC/LINE 3 MIC/LINE 4 MIC/LINE 5 MIC/LINE 6 MIC/LINE 7 MIC/LINE 8 MIC/LINE 9 MIC/LINE 11 MIC/LINE 13 MIC/LINE 15 MDR 16 1 INSERT 2 3 INSERT 4 INSERT MIX L MIX R 1 OUTPUTS 2 1 AUX OUT 2 MONO OUT L CR R LINE LINE LINE LINE LINE LINE LINE LINE MIC/LINE 10 MIC/LINE 12 MIC/LINE 14
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S gate 4 System Set-Ups LIVE SOUND SYSTEM WITH GATES ON SUB INSERT POINTS CH 4 CH 3 CH 2 CH 1 KEY KEY KEY KEY BALANCED BALANCED BALANCED BALANCED OUTPUT OUTPUT OUTPUT OUTPUT INPUT INPUT INPUT INPUT SUB INSERTS MIC/LINE 1 MIC/LINE 2 MIC/LINE 3 MIC/LINE 4 MIC/LINE 5 MIC/LINE 6 MIC/LINE 7 MIC/LINE 8 MIC/LINE 9 MIC/LINE 11 MIC/LINE 13 MIC/LINE 15 MDR 16 1 INSERT 2 3 INSERT 4 INSERT MIX L MIX R 1 OUTPUTS 2 1 AUX OUT 2 L CR R MONO OUT LINE LINE LINE LINE LINE LINE LINE LINE MIC/LINE 10 MIC/LINE 12 M
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S gate 4 Connections CONNECTING THE S gate 4 The are several ways to interface the S gate 4 to support a variety of applications. The S gate 4 features servo- balanced inputs and outputs, so connecting balanced and unbalanced signals is possible without any signal loss. The S gate 4 can be used on a single instrument by connecting to a mixer channelʼs insert points, or on an entire mix "in-line" between a mixerʼs outputs and a power amp or equalizer. INSERT POINTS Many mixers today provide cha
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Block Diagrahm 16 +4dBu +4dBu BYPASS OUT IN KEY LISTEN VCA OUTPUT INPUT OUT IN GAIN REDUCTION METER VCA DC CONTROL C O N N E C T I O N S I / O XLR DUCKER PIN 1 PIN 2 PIN 3 FILTER GND HOT COLD FULL WAVE RECTIFIER GATE CONTROL EXTERNAL I / O 1/4" GATE LED's KEY INPUT TIP RING SLEEVE ATTACK RELEASE TRIGGER HOLD RANGE HOT COLD GND 1/4" KEY RMS to DC HP LP EXPANDER / GATE STEREO CONVERTER TIP RING SLEEVE LINK DETECTOR RETURN SEND GND FILTERS STEREO LINK CH 3,4 are identical to CH 1,2 4 CHANNEL GATE/D
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Specifications System Specifications System Specifications Frequency Response 20Hz to 20kHz +/ - 0.5 dB Dynamic range 95 dBu, un-weighted, 22 Hz to 22 kHz THD 0.008 % typ. @ +4 dBu, 1 kHz Crosstalk 90dB, 22 Hz to 22 kHz Detector RMS Gate Trigger range variable (-50 to +20 dB) Attack variable (0.3 to 3000ms) Release variable (0.02 to 5 sec.) Hold variable (0.01 to 4 sec.) Range variable (0 to 100
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Specifications Audio Input Audio Input Connectors XLR and 1/4" TRS jack Impedance 20k Ohm balanced, 10k Ohm unbalanced Nominal Operating Level Max. Input Level +21 dBu, balanced and unbalanced CMRR Typ. 40dB, >55dB @ 1kHz Audio Output Audio Output Connectors XLR and 1/4" jack Impedance 60 Ohms balanced, 30 Ohms unbalanced Max. Output Level +21 dBu, balanced and unbalanced Power Supply Power Supply Mains Voltages/selectable USA/Canada ~120 V AC, 60 Hz U.K./Aust
