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1. VOLFRAM LIMITER USER S MANUAL IGS Audio Igor Sobczyk 3 Maja 76d 41 400 Mys owice Poland e mail igs o2 pl ph 48 601 597 592 www igsaudio com Please read all of the following instructions and save them for later reference before attempting to connect the unit to the mains EARTH This unit is connected via its power cord to the mains safety earth NEVER OPERATE THE UNIT WITH THIS EARTH CONNECTION REMOVED COVERS DO NOT remove the covers Refer servicing to qualified personnel only VOLTAGE Equipment is set to operate only at the voltage indicated on the back of the unit CHECK that the correct voltage is selected before connecting the AC mains supply FUSES CHECK that the fuse fitted is the correct type for the local mains voltage ALWAYS replace fuse with the correct type MOISTURE DO NOT expose the unit to rain or moisture If the unit should become so exposed REMOVE the mains power immediately CABLES PROTECT the mains power cord from damage though impact or abrasion HEAT ALWAYS site the unit away from sources of heat including direct sunlight and ensure adequate ventilation around the unit A CAUTION AVIS A RISK OF ELECTRICAL SHOCK DO NOT OPEN RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR CAUTION TO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK DO NOT EXPOSE THIS PRODUCT TO RAIN OR MOISTURE TO REDUCE THE RISK OF ELECTRICAL SHOCK DO NOT REMOVE TOP OR BOTTOM COVER REFER SERVICING TO QUALIFIED SERVI2. CE PERSONNEL Copyright 2014 All rights reserved The information in this document is subject to change without notice IGS Audio makes no warranty of any kind with respect to the material in this document and shall not be liable for errors contained herein or for incidental or consequential damages related to the use of the material Manual revision 1 0 December 2014 R IGS Thank you for buying this IGS Audio product Please read the information provided below very carefully before using your IGS unit Unpacking Your VOLFRAM LIMITER has been carefully and meticulously tested and inspected before dispatch Please check for any signs of transit damage If any signs of mishandling are found please notify the carrier and your dealer immediately Your VOLFRAM LIMITER packing should contain an VOLFRAM LIMITER with IGS Audio tag and power cord and this manual with the Warranty and RoHS CE WEEE Declaration attached Compatibility and Power There is a fuse socket near the power cable connector on the on the back of the unit Ensure that the correct fuse is being used before plugging the VOLFRAM LIMITER to the power outlet gt For US area 115V use 630mA Slow Blow Type T gt For Europe and rest of the world area 230V use 315mA Slow Blow Type T Always check the voltage selector on the back of the unit to ensure that it is set to the proper voltage available in your country IGS AUDIO VOLFRAM LIMITER Stereo FE
3. T compressor limiter The Volfram Limiter is a dual mono version of the legendary 1176 archetype The 1176 is a very well known and appreciated compressor in professional recording studios all over the world Whoever heard how this compressor works with vocals will never be able to manage without one Additionally the Volfram works great with drums and synthesizers It is a 45dB transistor amplifier equipped with a remarkable limiter Compression is achieved with the FET transistors At extreme settings the Volfram adds some pleasant distortion to the output The core of versatility in sound of the 1176 lies in the balance between the Input Output and Release knobs All manipulators are 12 pole 6 pole for ratio HPF switches It is a pure A class circuit Block diagram So ee eet oe BYPASS E gt rt WET DRY GR STAGE SIGNAL AMP DRIVER Balanced OUTPUT Balanced INPUT VOLFRAM LIMITER BLOCK DIAGRAM INPUT OUTPUT LINK ON OFF ATTACK RATIO GR METER VOLFRAM LIMITER RELEASE GR METER INPUT RATIO ATTACK RELEASE WET DRY BYPASS OUTPUT HPF LINK ON OFF BYPASS HPF WET DRY Big GR meter showing the amount of gain reduction applied Input level knob Allows to adjust the compressor ratio From 2 1 up to 20 1 SLAM mode all buttons in Time delay between the appearance of the signal and the compressor reaction Time delay between the disappearance of the signal and the compressor
4. plays thru the unit regardless the settings at the front panel Please check the cables connecting the rack Warranty This device is declared to be free from defects in material and workmanship for a period of three years Any device found defective within three years from the delivery date and returned to the factory will be repaired adjusted or replaced and sent to the customer with no charge The customer always pays the shipping cost to us This warranty does not cover expendable items such as tubes or fuses If the defect has been caused by a misuse or abnormal operation conditions the repair will be billed at a nominal cost The product should be returned in its original package if this is possible or packed in such a way that it is not damaged during the shipment We are not to be held responsible for any damages during the shipment 19 units shall always be packed in a box with support for the rack ears All 500 series modules need to be secured in ESD bag and protected with foam We will charge the customer 20 VAT if the packing material needs to be replaced If we find that the product works perfectly the customer will be invoiced 50 VAT to cover our costs of examination and handling plus the cost for returning the product to the customer www igsaudio com
5. reaction MIX knob for parallel compression The audio signal passes thru the compressor circuit when this switch is set to IN The BYPASS setting causes the circuit to be taken off the signal path Output level knob This switch applies the high pass filtering to the sidechain circuit It allows to avoid the pumping sound of ie the kick drum low frequencies will not trigger the compressor Set to OFF or one of the available frequencies Channel linking option for stereo compression VOLFRAM LIMITER technical specification Legendary FET design A class design Two linkable channels Wet Dry mix knob for parallel compression Operating Level 4dBu Maximum Input 18dBu Maximum Output 18dBu Input impedance 10k ohm Output Impedance 600 ohm Max Gain Reduction 30 Maximum Gain 45 Attack Time 0 1 1ms Release Time 0 1 to 1 5s Frequency response 20Hz 20kHz THD N Q0dBu 80 dB A Power consumption 20W Shipping weight 7kg Dimensions 19 2U 230mm deep Troubleshooting My unit doesn t light up the VU meter is dark Please check the power cord and the switch at the front of the unit is in ON position Check the fuses The signal plays thru but there is no change in signal when i turn the knobs Please check the bypass switch Check the MIX knob should be turned fully clockwise No signal
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