G400 - User Manual
Contents
1. AUDIO G400 4 Channel Frequency Conscious Noise Gate Operation Manual June 2005 This page has been left intentionally blank for your notes Page 2 CONTENTS 1 0 6 0 7 0 OVERVIEW DESCRIPTION OF CONTROLS Bypass switch and led Listen switch Hi Pass control Lo Pass control Ext Key led Threshold control Above Below leds Attack switch Range switch Release control Link switch EXTERNAL CONNECTIONS Side Chain insert Input Output Level switch Power switch Power inlet INSTALLATION Inspection and unpacking Phantom Operating Environment 48V indicator CE Standard and LVD Pad Power Requirement Listen WARRANTY TECHNICAL SPECIFICATION DIMENSIONS Page 3 5 7 8 9 10 11 13 14 1 0 OVERVIEW Main Features 4 channels of Frequency Conscious Noise Gating Variable Hi and Low Pass side chain Filters Fully variable Threshold and Release Fast and Slow Attack modes Range switching between 20dB and 80dB Side chain Listen facility Stereo linking Side chain inserts Balanced Inputs Outputs with 4dBu 10dBV switching The G400 is a professional 4 channel noise gate that can be operated as 4 separate processors or linked as two independant stereo pairs In Link mode Channel 1 and 3 provide Master control and rms summing is used to ensure that signals from both the linked channels operate the gate Each channel has fully variable controls for filter Frequency2. HIEMAN WEAS In keeping with our policy of continuous improvement LA Audio reserves the right to alter specifications without prior notice Manufactured in the UK by LA Audio Web www laaudio co uk Page 14
3. Threshold and Release Range is switchable to provide either full muting 80dBu or a more subtle level of signal attenuation 20dBu Two Attack modes are available Fast or Slow and Release is manually adjustable In built sidechain auto level sensing and Hold circuitry ensure that false triggering and chatter are kept to a minimum High and Low pass filters are included and can be used for a wide range of frequency conscious gating applications A LISTEN facility allows the filters to be easily tuned by ear Each channel also has a sidechain insert with front panel indication when an External Key jack is plugged in Led indicators are provided for Above Below Threshold Bypass and Link All inputs and outputs are electronically balanced and can be switched between 4dBu and 10dBV operating levels Page 4 2 0 DESCRIPTION OF CONTROLS AUDIO BYPASS EXT KEY BELOW ABOVE LINK BYPASS EXT KEY BELOW ABOVE O O O Ojo O HI PASS LO PASS THRESHOLD SLOW RELEASE HI PASS LO PASS THRESHOLD SLOW RELEASE DUAL BYPASS FAST BYPASS FAST 150 15 20 z 1 150 15 20 a 1 2 fet 2 X50 L fi ST REO No fr f a 05 5 a l ATTACK 58 0 5 5 D ATTACK LISTEN J J RANGE a LINK LISTEN 7 I RANGE a 1 w 1 O 22 3k 0 25 30 50 0 0 0 4 2200 3k 0 25 30 Hz z di Hz kHz MASTER SLAVE GATE 1 GATE 2 2 1 2 2 2 3 2 4 BYPASS switch Pressing BYPASS cancels gating by removing
4. the side chain voltage from the voltage controlled amplifier VCA The Input Output and level change circuitry remain in the signal path The BYPASS led lights when the compressor is Bypassed LISTEN switch This facility allows the side chain signal to be monitored at the channel output This is useful for tuning the side chain filters by ear HI PASS control This control sets the cut off frequency of the high pass filter in the side chain signal path Side chain signals at frequencies below the cut off frequency are attenuated and so will not operate the gate Use this control to prevent low frequency signals such as a miked up bass drum opening the gate LO PASS control This control sets the cut off frequency of the low pass filter in the side chain signal path Side chain signals at frequencies above the cut off frequency are attenuated and so will not operate the gate Use this control to prevent high frequency signals such as a miked up hi hat cymbal opening the gate Please note The filters are always in the side chain signal path so if not required it is necessary to set the controls to their extreme frequencies to prevent them affecting the side chain signal Page 5 O Ea a a S S S S cai a l SLOW SLOW Bypass HI PASS LO PASS THRESHOLD SLOW RELEASE Bypass HI PASS LO PASS THRESHOLD SLOW RELEASE 150 15 20 OR 150 15 20 to say bso 4 A f ATTACK 4 i 5e 500 4 A A 7
5. ATTACK 4 AUDIO LISTEN J J J RANGE a LISTEN 4 J J J RANGE 7 25 50 20 0 01 025 50 0 1 O 22 3k 30 22 3k 30 Hz kHz dB m 80dB s Hz Hz dB m 800B s MASTER 20dB SLAVE 20dB GATE 1 GATE 2 2 5 EXT KEY led EXT KEY lights when a jack is plugged into the side chain insert on the rear of the G400 2 6 THRESHOLD control THRESHOLD sets the reference level at which the gate will open and allow audio through to the output Control range is 50dBu to 20dB The side chain on the G400 has been designed with auto level sensing and Hold circuitry to ensure that both fast transient and low frequency signals operate the gate without false triggering and or chatter However if the gate repeatedly opens and closes on a particular signal reducing the THRESHOLD level can often correct this 2 7 ABOVE BELOW leds These two leds indicate the relationship between the side chain signal which is normally the same as the input signal unless the side chain insert is used and the THRESHOLD setting The BELOW led indicates that the signal level is below threshold and the gate is closed In practise when the BELOW led lights the audio starts to fade at a rate set by the RELEASE control The ABOVE led indicates that signal levels are above threshold and the gate is open When the gates closes the ABOVE led starts to fade at a rate set by the RELEASE setting 2 8 ATTACK switch Two switch
6. ONS ELECTRICAL Frequency response Input Impedance Maximum Input Level Input Output Level Output Impedance Max Output Level THD Signal to Noise Ratio Threshold Range Attack Release High Pass Filter Low Pass Filter Power Requirement PHYSICAL Input Connectors Output Connectors Power Connection Dimensions mm Weight Shipping Weight Temperature Range 20Hz to 20kHz 0 0 5dB 20k balanced 20dBu 4dBu or 10dBV 100R balanced 20dBu lt 0 05 1kHz 4dBu gt 90dB 4dBu out 22Hz 22kHz 50dB to 20dB 80dB or 20dB Fast 50uS Slow 1mS 10ms to 4s variable 22Hz to 3kHz 250Hz to 30kKHz 15VA 115 230V AC 50 60Hz XLR 3 pin Pin 2 hot XLR 3 pin Pin 2 hot IEC 3 pin socket Detachable lead 482 19 W 164 6 5 D 44 1 75 H 2 9 kg 6lbs 3 6kg 8lbs Operating 0 C to 50 C Storage 30 C to 75 C 7 0 DIMENSIONS O s s FF ss EE E se 5 5 eat me Le ne mer ba qe one rame mu re ge est D pe pii 4 e400 LA 2 Cy re OF sO Og OQ L Ci 530 A GED a HO OL Or Ge Am ol ef et def ee em D def ee of ont ci 2a cui i 483 0 H 190 0 O ruse foroa CE CAUTION r 4 7 r 1 on A tise Don WUC RAD AO eat Ce lee ent a A tom GM ns Gus oT ses CHOC o OCHO Il 0 O POWER 230V V 50Hz 15VA As
7. able ATTACK rates are available on the G400 SLOW provides an attack speed which is suitable for most program material without introducing transient clicks FAST is intended for gating percussive instruments or signals with fast attacks transients Page 6 BYPASS BYPASS PROG THRESHOLD RATIO omit RELEASE GAIN COMPRESSOR 1 22 18 14 10 8 6 4 00000000 LINK oe 60000000 POWER THRESHOLD RATIO aao RELEASE GAIN 10 4 20g 1 2 f 0 KY f A Pres Patate G6200 MODE a A 1 1 DUAL GATE aa KNEE v LINK PROG KNEE COMPRI N7 0 04 f N N LEA 0 f V7 mSOFT dB dB a dB HARD SLAVE COMPRESSOR 2 2 9 2 10 2 11 RANGE switch The RANGE switch determines the amount of signal attenuation that occurs during gating The G400 provides for full signal muting 80dB or a more subtle attenuation 20dB RELEASE control RELEASE adjusts the speed at which the gates closes once the input signal level has fallen below that set by the THRESHOLD control Control range is 10mS to 4S Please note With instruments such as bass guitars short RELEASE times can cause the gate to chatter If this occurs increase the release time LINK switch Pressing the LINK switch couples channels 1 amp 2 and 3 amp 4 for stereo operation Channels 1 and 3 become the masters the controls on channels 2 and 4 are disabled The sid
8. code Green and Yellow Earth Blue Neutral Brown Live WARNING THIS APPLIANCE MUST BE EARTHED Please note A protective earth connection made by way of the earth conductor in the power cord is essential for safe operation Page 11 5 0 WARRANTY Your LA Audio G400 has been manufactured to a high standard using quality components If correctly installed and operated the unit should give years of problem free operation However in the event of a defect in material or workmanship causing failure of the unit within 1 year of the date of original purchase we will agree to repair or at our discretion replace any defective item without charge for labour or parts To receive service under this warranty it is necessary to return the unit to an LA Audio authorised service centre or to the factory with a dated receipt as proof of purchase After repair the unit will be returned to you free of charge Limitations This warranty does not cover damage resulting from accident or misuse The warranty is void unless repairs are carried out by an authorised service centre The warranty is void if the unit has been modified other than at the manufacturers instruction The warranty does not cover components which have a limited life and which are expected to be periodically replaced for optimal performance We do not warrant that the unit shall operate in any way other than as described in this manual Page 12 6 0 TECHNICAL SPECIFICATI
9. e Power cord country specific please check e Operator Manual this book OPERATING ENVIRONMENT The G400 is designed to operate between 0 C and 40 C 32 112 F with relative humidity no more than 80 Should the units be installed in an equipment rack ensure that the ambient temperature conforms to these levels CE STANDARDS AND THE LOW VOLTAGE DIRECTIVE LVD The G400 has been designed to comply with the latest Electromagnetic Compatibility EMC regulations However we recommend you do not operate the unit close to strong emitters of electromagnetic radiation such as power transformers motors mobile telephones or radio transmitters The unit should only be connected to a power supply of the type described in 4 4 POWER REQUIREMENTS or as marked on the unit Disconnect the mains supply before removing any cover POWER REQUIREMENTS The G400 is factory configured for either 230V 50Hz ac or 115V 60Hz ac mains operation Please refer to the following diagram which shows the transformer connections for 230V and 115V The rating of the rear panel fuse is shown on the cover 230V 115V T125mA T250mA All are slow blow type Page 10 Please note If the fuse requires changing at any time please ensure the correct type is fitted An incorrect fuse could cause damage to the unit and may constitute a fire hazard The detachable IEC mains lead connections to the appliance are coloured in accordance with the following
10. e chain circuitry on the G400 uses true rms summing to ensure that the signals in both the linked channels are used to control the gate Page 7 3 0 EXTERNAL CONNECTIONS CD SIDE CHAIN m Ring Send Tip Return F o i amp m D 3 1 3 2 3 3 3 4 SIDECHAIN The Side chain TRS jack allows connection of an external processor such as a parametric equaliser for more sophisticated frequency conscious gating applications External key signals are often used for gated reverb rhythmic and bass enhancement effects This is an unbalanced insert with Ring wired as Send and Tip wired as Return Please note Plugging a jack into the side chain connector breaks the control signal path which must then be completed by the externally connected equipment INPUT Electronically balanced Input with pin 2 wired hot signal Unbalanced operation is possible by joining pin 3 to pin 1 signal ground and using pin 2 as signal hot Please note To maintain correct signal levels in un balanced applications pin 3 must be joined to pin 1 and not left un connected OUTPUT Electronically balanced Output with pin 2 wired hot signal For un balanced operation pin 3 can be joined to pin 1 i e pin 2 signal hot and pins 1 amp 3 ground screen Please note To maintain correct signal levels in un balanced applications pin 3 must be joined to pin 1 and not left un connec
11. ted LEVEL These switches select the input and output operating level for each channel between 4dBu switch out and 10dBV switch in Page 8 on FUSE CE CAUTION ie A LEVEL OUTPUT RISK OF ELECTRIC SHOCK SIDE OUTPUT INPUT DO NOT OPEN CHAIN O CH 3 O I THIS UNIT MUST BE EARTHED Ring Send O Ch ONG Or eee m 4dB I I AVIS dB RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR INTERVENTION SEULMENT PAR PERSONNEL QUALIFIE O CO POWER 230V V 50Hz 15VA REFER SERVICING TO QUALIFIED PERSONNEL CH 4 Cc TO REDUCE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE MADE IN THE UK BY LA AUDIO The Side Chain insert operates at 2dBu in both 4dBu and 10dBV modes 3 5 POWER Mains power switch for G400 3 6 POWER INLET Standard IEC mains inlet for use with a detachable mains cable See Section 3 4 for details of power requirements and fusing Please note The mains protection fuse is inside the unit accessed by removing the top cover Ensure that the unit is disconnected from the mains supply before attempting to replace the fuse Page 9 4 0 INSTALLATION 4 1 4 2 4 3 4 4 INSPECTION AND UNPACKING The G400 has been carefully packed at our factory in a carton designed to withstand handling in transit Should the unit appear to have been damaged in transit notify your dealer immediately and do not discard any of the packing The carton should contain e The G400
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