Series 80B User Manual
Contents
1. 3 Statement of ROHS Compliance PMI Audio Group manufactures complete electronic products which are covered by the European Union s Removal of Hazardous Substances directive 2002 95 EC ROHS This directive seeks to eliminate toxic substances from the manufacturing process such that when equipment is disposed of at the end of its life cycle the materials it contains do not contaminate the environment and pose health risks Banned substances are lead mercury cadmium hexavalent chromium polybrominated biphenyls PBB and poly brominated diphenyl ethers PBDE Lead is used together with tin in solder connections to reduce the melting point of solder Lead free solder requires higher soldering temperatures which in turn places greater thermal stress on components OMPLIANT Pe PMI Audio Group takes seriously its obligations under the ROHS directive and insists that its factories use only components that are certified ROHS compliant as well as lead free solder In a very few cases the necessary components may not yet be available to the world market but we work continuously to eliminate any such exceptions at the earliest opportunity Our printed Circuit Boards PCB s and all soldered joints have been lead free since 2005 Statement of WEEE Policy PMI Audio Group manufactures many complete electronic products which are covered by the European Union s Waste Electric and Electronic Equipment dir2. DUAL MICROPHONE PREAMPLIFIER AND EQUALISER TRIDENT AUDIO DEVELOPMENTS SERIES 80B OWNERS HANDBOOK TRIDENT AUDIO DEVELOPMENTS Designed in England and assembled in the UK and USA to Trident Audio s strict specifications Trident Audio is manufactured under the direction of and distributed exclusively by PMI AUDIO GROUP USA 1845 W 169th Street Gardena CA 90247 toll free 877 563 6335 fax 310 323 0900 UK Unit 4 Minerva Court Woodland Industrial Estate Torquay TQ2 7BD tel 44 0 1803 612700 fax 44 0 1803 612009 email info trident audio com www trident audio com Written by Professor Malcolm Toft C SAA TRIDENT AUDIO DEVELOPMENTS TRIDENT AUDIO TRIDENT SERIES and SERIES 80B are all registered trademarks of PMI Audio Group Important Safety Information CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated dangerous voltage within the product s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons The exclamation point within an equilateral triangle is intended to alert the user to the presence of
3. album James Taylor s first album and three albums with T Rex He was also the mixing engineer on the Beatles Hey Jude single In 1972 Trident studios decided to buy a new recording console and Malcolm was able to convince the owners that they could in fact build one themselves From this idea was born Trident Audio Developments Ltd which went on to become a leading manufacturer of music recording consoles One of the company s earliest advertising slogans was designed by recording engineers for recording engineers This became a key component of what made the Trident Sound unique As a recording engineer rather than an electronics engineer Malcolm has always designed with his ears rather than a text book and it is this coupled with over thirty years experience that has enabled him to develop his own philosophy of sound that is his trademark The Series 80B rack unit is derived from the legendary Series 80 Consoles designed by Malcolm in the late 1970 s It incorporates an exact replica of the mic preamp and equaliser design that gave the original console its unique sound These consoles have been used to record just about every major artist in the past three decades including Elton John Dire Straits David Bowie Rod Stewart and Stevie Wonder to name but a few More recently they have been used to record artists such as Radiohead and Pavarotti The Trident Audio Developments Series 80B rack unit therefore brings with it a
4. Dealers are expressly forbidden to export to North South Central and Latin America Grey Market purchases are not covered by any warranty In the case that a PMI Audio Group PMI Audio UK Product must be returned to the factory from outside its respective territory customer shall adhere to specific shipping customs and commercial invoicing instructions given with the Return Authorization as PMI Audio Group PMI Audio UK will not be responsible for transportation costs or customs fees related to any importation or re exportation charges whatsoever Disclaimer of Warranty EXCEPT FOR THE FOREGOING WARRANTIES PMI HEREBY DISCLAIMS AND EXCLUDES OTHER WARRANTIES EXPRESS OR LIMITED INCLUDING BUT NOT LIMITED TO ANY OR ALL IMPLIED WARRANTIES OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE AND OR ANY WARRANTY WITH REGARD TO ANY CLAIM OF INFRINGEMENT THAT MAY BE PROVED IN SECTION 2 312 12 OF THE UNIFORM COMMERCIAL CODE AND OR IN ANY COMPARABLE STATE STATUTE PMI HEREBY DISCLAIMS ANY REPRESENTATIONS OR WARRANTY THAT THE PRODUCT IS COMPATIBLE WITH ANY COMBINATION OF NON PMI AUDIO PRODUCTS PURCHASER MAY CHOOSE TO CONNECT TO THE PRODUCT Limitation of Liability THE LIABILITY OF PMI IF ANY AND PURCHASER S SOLE AND EXCLUSIVE REMEDY FOR DAMAGES FOR ANY CLAIM OF ANY KIND WHATSOEVER REGARDLESS OF THE LEGAL THEORY AND WHETHER ARISING IN TORT OR CONTRACT SHALL NOT BE GREATER THAN THE ACTUAL PURCHASE PRICE OF THE PRODUCT WITH RESPECT TO WHICH
5. Mic or Line input is selected via 7 r the front panel Input switch The outputs from each channel are low impedance and designed to operate with long cable runs without signal degradation A standard IEC mains inlet is provided for AC mains power Operating voltage of either 120 or 240 volts is selectable by rotating the fuse holder incorporated into the mains inlet socket INPUT SECTION The input section of the Series 80B rack is designed specifically for professional audio applications It consists of a very high quality transformer coupled microphone amplifier and a separate electronically balanced line input amplifier The microphone amplifier is of a unique design that is able to handle signal levels from 60dBu to as high as 15dBu without the use of a separate pad switch Even though such a wide range of signal levels is accommodated adjustment of the gain is extremely smooth particularly at high signal levels where other designs tend to have cramped level adjustment at the end of the control In addition it exhibits near theoretical minimum noise figures has an extremely fast transient response and accommodates a wide range of input levels with a frequency response that extends to above 40kHz Naturally best results will be achieved using a high quality condenser microphone The microphone amplifier will however also bring out the best in either a dynamic or ribbon microphone The combination of high gain with
6. Number Serial Number Dealer s Name RETAIN FOR YOUR RECORDS PLEASE DISPATCH AND RETURN THE REGISTRATION CARD BELOW TO PMI AUDIO WITHIN 14 DAYS OF PURCHASE Specifications and model numbers are subject to change without notice l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l Y 0 Product Registration Information Please fill in the sections below and return Name Address City State Zip Code Telephone Number email Address Model Purchased Date Purchased Serial Number Dealer Comments What magazines do you read to inform your buying decision check all that apply _ MIX _ Electronic Musician _ EQ _ Sound on Sound _ Pro Audio Review _ Recording _ Pro Sound News _ Audio MIDI TRIDENT AUDIO DEVELOPMENTS DISTRIBUTED BY PMI AUDIO GROUP 1845 W 169th Street Gardena CA 90247 USA
7. low noise is particularly useful when working with ribbon microphones as most models have an inherently low output level When connecting a microphone set the Mic gain control to its minimum position fully anti clockwise and the Output Level control to its 0 position The Input switch should not be pressed in If required engage the 48V phantom power whilst the Mic gain control is at minimum Allow up to 30 seconds for the microphone to reach its normal operating level and advance the Mic gain control until a suitable level is achieved at the output of the unit The O P Peak LED signal indicator is located above and to the left of the output level control It is designed to light when a signal level of 10dB occurs at the output stage This provides plenty of overload margin as the Series 80B rack unit is capable of very high output levels up to 26dBm into a balanced load By setting the level as described above adequate headroom is maintained and there should be no danger of overloading following equipment The phase polarity reverse switch is employed when phase interference occurs between multiple microphones Such interference results when microphones at various placements pick up the same sound source at slightly different times When the output of the microphones combine cancellation occurs at certain frequencies This effect is known as comb filtering Switching the polarity on one microphone may serve to
8. provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet 10 Protect the power cord from being walked on or pinched particularly at plugs convenience receptacles and the point where they exit from the apparatus 11 Only use attachments and accessories specified by the manufacturer 12 Use only with a cart stand tripod bracket or table specified by the manufacturer or sold with the apparatus When a cart is used use caution when moving the cart apparatus combination to avoid injury from tip over 13 Unplug this apparatus during lightning storms or when unused for long periods of time 14 Refer all servicing to qualified service personnel Servicing is required when the apparatus has been damaged in any way such as power supply cord or plug is damaged liquid has been spilled or objects have fallen into the apparatus the apparatus has been exposed to rain or moisture does not operate normally or has been dropped 15 Apparatus designed with Class construction must be connected to a mains socket outlet with a protective earthing connection the third grounding prong 16 This apparatus may be equipped with a single pole rocker style AC mains power switch If so this switch is located on the front panel and should remain readily accessible to the user 17 The manufacturer reserves the right to change the technical specification of the product without prior notice
9. SUCH CLAIM IS MADE IN NO EVENT SHALL PMI BE LIABLE TO PURCHASER FOR ANY SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES OF ANY KIND INCLUDING BUT NOT LIMITED TO COMPENSATION REIMBURSEMENT OR DAMAGES ON ACCOUNT OF THE LOSS OF PRESENT OR PROSPECTIVE PROFITS OR ANY OTHER REASON WHATSOEVER Information in this User Guide is subject to change without notice No part of this User Guide may be reproduced or transmitted in any form or by any means electronic mechanical or by any other means for any purpose without the express written permission of PMI Audio Group PMI Audio Group may have trademarks copyrights or other intellectual property rights covering the subject matter of this User Guide Except as expressly provided in any written agreement from PMI Audio Group the furnishing of this User Guide is provided for the sole use of the authorized User or Service Agent where applicable and does not give the User any license to use any trademarks copyrights or other intellectual property of PMI Audio Group PMI PMI AUDIO TED FLETCHER MEEQUALIZER STUDIO PROJECTS JOEMEEK TOFT AUDIO DESIGNS CURRENTSENSE MEEKROPHONE TRAKPAK and If it Sounds Right It is Right are either registered trademarks or trademarks of PMI Audio Group in the USAand or other countries Copyright 2010 PMI Audio Group All rights reserved Owners Registration TO BE COMPLETED AT TIME OF PURCHASE Name Date of Purchase Model
10. ective 2002 96 EC WEEE This directive seeks to ensure that waste electric and electronic equipment is disposed of in an environmentally responsible manner at the end of its life cycle PMI Audio Group takes seriously its obligations under this directive to take back WEEE affected products and from 13th August 2005 will mark all such products with the crossed out wheeled bin symbol Business to Business products PMI Audio Group will cost neutrally take back WEEE affected electric and electronic equipment in this category from 1st January 2006 PMI Audio Group will work with disposal and recycling partners working within the EU The waste electric and electronic equipment can then be turned over to a disposal and recycling companies in the countries concerned Business to Customer products emerging electric and electronic equipment will be disposed of by local authorities collection systems Dual Use products this equipment will be disposed of by local authorities collection systems CONTENTS About the Designer Product Description Connecting the Unit Input Section Equaliser Trouble Shooting Technical Specifications 11 12 ABOUT THE DESIGNER Malcolm Toft started his career in the late 1960 s as a recording engineer and was the first engineer to be employed at the famous Trident Recording Studios in London Among his credits are the recording of David Bowie s Space Oddity
11. fication trademark serial number markings have been defaced altered or removed PMI excludes from warranty coverage Products sold AS IS and or WITH ALL FAULTS and excludes used products which have not been sold by PMI to the purchaser PMI also excludes from warranty coverage consumables such as fuses and batteries tubes etc 14 4 Proof of Purchase The dealer s dated bill of sale must be retained as evidence of the date of purchase and to establish warranty eligibility 5 Grey Market All warranties apply only to PMI Audio Group Products purchased and used in the USA and to PMI Audio UK Products purchased and used in the UK EU and all other countries outside of the USA All warranties apply only to PMI Audio Group PMI Audio UK Products originally purchased from an authorized PMI Audio Group PMI Audio UK dealer PMI Audio Group PMI Audio UK Product that was not purchased through an authorized and legitimate sales channel is considered Grey Market Warranties for PMI Audio Group PMI Audio UK Products purchased outside their respective territories will be covered by the PMI Audio Group PMI Audio UK Importer for that specific country or region Products originally sold to the USA market and consequently resold overseas forfeit their warranty as do PMI Audio UK Products sold outside of the UK and Europe American PMI Audio Group Dealers are expressly forbidden to export PMI Audio Group Products and PMI Audio UK Distributors and
12. g time and materials rate No repair or replacement by Purchaser of any Product or part thereof shall extend the warranty period as to the entire Product The specific warranty on the repaired part only shall be in effect for a period of ninety 90 days following repair or replacement of that part or the remaining period of the Product warranty whichever is greater 2 Exclusive Remedy Acceptance Purchaser s exclusive remedy and PMI s sole obligation is to supply and pay for all labor necessary to repair any product found to be defective within the warranty period and to supply at no extra charge new or rebuilt replacements for defective parts If repair or replacement fails to remedy the defect then and only in such an event shall PMI exchange to Purchaser a new or reconditioned unit Purchaser s failure to make a claim as provided in paragraph 1 above or continued use of the product shall constitute an unqualified acceptance of such Product and a waiver by Purchaser of all claims thereto 3 Exceptions to Limited Warranty PMI shall have no liability or obligation to Purchaser with respect to any Product subjected to abuse negligence accident modification failure of the end user to follow the operating and maintenance procedures outlined in the users manual attempted repair by non qualified personnel operation of the unit outside of the published environmental and electrical parameters or if such Product s original identi
13. historic pedigree but what excites Malcolm tremendously is the fact that he is able to offer his designs at a price that is now affordable to the smaller studios and home recordists E PRODUCT DESCRIPTION TA tk gat 15 00 eu 1 30 tt 450 5 gt 35 5 ie tes ria Sa er N 30B i D Ty dl Ak jn E N a 55 JL PRE EQ 0 a 10 60 hi r POST EQ e ON OO et g 4 ke B 7 E J lt 10 a PHANTOM POWER 2 180 m 180 2k se at ae C m 5 e Cl we TRIDENT 1 1 aer ne Jn gt o hd e e 4k 6t1 1 1 50Hz A i O 0 eo o OV O ooe 10 e 4 r n n e 20 a R e n 30 PO o e 10 The Trident Audio Developments Series 80B is a 2 channel rack mountable version of the legendary Series 80B console Comprising two independent channels each with a microphone line amplifier and four band equaliser it is designed to process incoming signals from a microphone or line level instrument and output to a recording device such as a digital audio workstation or analog multi track tape recorder Mains powered with 48 volt phantom power independently switchable for the two channels the 80B operates as acomplete stand alone unit offering two channels of high quality audio processing In keeping with the functionality of the Trident Series 80 console each channel strip of this rack unit features insert points phase reve
14. important operating and maintenance servicing instructions in the literature accompanying the appliance WARNING TO AVOID FIRE OR ELECTRIC SHOCK HAZARD DO NOT EXPOSE THIS APPARATUS TO WATER RAIN OR MOISTURE NOTE This apparatus does not exceed the Class A Class B whichever is applicable limits for radio noise emissions from digital apparatus as set out in the radio interference regulations of the Canadian Department of Communications ATTENTION Le pr sent appareil num rique n met pas de bruits radio lectriques d passant las limites applicables aux appareils num riques de class A de class B selon le cas prescrites dans le r glement sur le brouillage radio lectrique dict par les ministere des communications du Canada These limits are designed to provide reasonable protection against harmful interference in a commercial residential installation respectively This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications There is no guarantee that interference will not occur in a particular installation If this equipment does cause interference to radio or television equipment reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by any combination of the following measures 1 Relocate or
15. l control is turned up 3 The line input doesn t work Is it connected to the correct input on the back of the unit Is the input selected to LINE Make sure the Line input level control is set to O 4 The equaliser doesn t work Is the EQ switch selected to IN LED illuminated 11 TECHNICAL SPECIFICATIONS Input Impedance Microphone Line Output Impedance Gain Microphone Line Noise Microphone Line Maximum Levels Mic Input Line Input Distortion Mic Input Line Input Frequency Response Mic Input Line Input Nominal Operating Level Peak LED Threshold 1 2k ohm transformer balanced 15k ohm electronically balanced lt 100 ohm electronically balanced 15dB to 60dB 15dB to 10dB lt 128dBu ref 150 ohm 20Hz 20kHz lt 85dBu EQ In 20Hz 20kHz 24dBu at all frequencies 24dBu at all frequencies lt 0 05 T H D 50dBu input 4dBu output lt 0 05 T H D 4dBu input 4dBu output 1dB 20Hz to 20kHz 1dB 20Hz to 20kHz 4dBu 10dBu In accordance with our policy of continuing product improvement we reserve the right to alter specifications without prior notice 12 Notes 13 Limited Warranty THIS PRODUCT IS FOR PROFESSIONAL USE ONLY PMI Audio Group warrants that all products will be free from defects in material or workma
16. minimise this effect To set up the Series 80B for a line level signal depress the Input switch and adjust the Line gain control to its midway position with the Output Level control set to 0 Avoid selecting the 48V phantom power in the Line mode as this will cause a loud noise when the phase reverse switch is operated At its midway position in Line mode the unit is designed to give unity or OdB gain This makes for an easy reference point when using line level inputs and a detent is provided at the centre point of the gain control for this purpose As described above the Output Level control and LED indicator is used to set an appropriate level through the unit EQUALISER The Series 80B rack incorporates a classic four band equaliser which is identical to that employed in the Trident Series 80 console It consists of frequency switchable high and low pass shelving sections coupled with two swept low and high mid range bands and a switchable 50Hz 12dB per octave filter Both swept midranges have been carefully chosen for maximum effect on music programme and a good degree of overlap is provided For those not familiar with the difference between a shelving and peaking equaliser the differences are as follows Ashelving equaliser boosts or attenuates all frequencies equally above or below a certain point The frequency specified for a shelving equaliser circuit is usually at the point where i
17. nship A For a period of one 1 year from the date of purchase hereinafter the labor warranty period PMI Audio Group will repair or replace this Product if determined to be defective After the expiration of the labor warranty period the Purchaser must pay labor charges B In addition PMI Audio Group will supply at no charge replacements for defective parts for a period of one 1 year from the date of purchase During the labor warranty period to repair the Product the Purchaser must return the defective Product freight prepaid or deliver it to a PMI Audio Group Service Center The Product to be repaired is to be returned in either its original carton or a similar package affording an equal degree of protection PMI Audio Group will return the repaired Product freight prepaid to the Purchaser PMI Audio Group is not obligated to provide the Purchaser with a substitute unit during the warranty period or at any time Conditions of Warranty 1 Notification of claims Warranty Service If Purchaser discovers that the Product has proven defective in material or workmanship then written notice with a full explanation of the claim shall be given promptly by the Purchaser to PMI but all claims for warranty service must be made within the warranty period If after investigation PMI determines that the reported problem was not covered by the warranty Purchaser shall pay PMI for the cost of investigating the problem at it s the prevailin
18. pectively Lastly set the EQ switch to the in position the associated LED will illuminate Rotation of the high frequency shelving control in a clockwise direction emphasises high frequencies while turning the control in an anti clockwise direction from centre attenuates high frequencies Operating the frequency select switch in the high frequency section introduces a subtle change of emphasis to the affected high frequencies as the shelving knee is changed from 12kHz to 8kHz Likewise rotating the low frequency shelving control in a clockwise direction will emphasise low frequencies while turning the control in an anti clockwise direction from centre attenuates low frequencies Adjusting the frequency select switch in the low section introduces a subtle change of emphasis on the affected low frequencies by altering the shelving point from 120Hz down to 60Hz The low mid and high mid equaliser sections are peaking filters Adjustment of their parameters is achieved by use of the center detented boost cut knob and its associated frequency sweep knob The relation between each pair of controls is denoted by a white line on the front panel connecting the two together Boost or cut of a given frequency is performed by moving that control from its centre detent position clockwise for boost anti clockwise to cut The frequency to be boosted or cut is selected by the frequency sweep control knob The range of frequencies of
19. reorient the receiving antenna 2 Increase the separation between the equipment and the receiver 3 Plug the equipment into an outlet on a circuit different from that to which the receiver is connected 4 Consult your dealer or experienced radio television technician for additional assistance CAUTION Changes or modifications to this equipment not expressly approved by the party responsible for compliance could void the user s authority to operate this equipment Important Safety Instructions 1 Read these instructions 2 Keep these instructions 3 Heed all warnings 4 Follow all instructions 5 Do not use this apparatus near water Do not expose to drips or splashes Do not place any objects filled with liquids such as vases on the apparatus 6 Clean only with dry cloth 7 Do not block any ventilation openings Do not install this apparatus in a confined space such as a book case or similar unit Install only in racks designed for the purpose and in accordance with manufacturers instructions 8 Do not install near any heat sources such as radiators heat registers stoves or other apparatus including amplifiers that produce heat 9 Do not defeat the safety purpose of the polarized or grounding type plug A polarized plug has two blades with one wider than the other A grounding type plug has two blades and a third grounding prong The wide blade or the third prong are provided for your safety If the
20. rse which operates on both microphone and line inputs and an output level control with peak signal indication All inputs and outputs are balanced so that maximum signal integrity and high output levels are assured with minimum distortion The Series 80B rack provides a pristine signal path of exceptional quality for subtle control of the audio path or to give extra punch and dynamics to a lacklustre signal Whatever the application the Series 80B will deliver that signature sound for which the Trident Consoles are so highly regarded CONNECTING THE UNIT Distributed Exclusively by PMI Audio Group Gardena California 90247 USA www trident audi The rear panel of the unit provides both XLR and 1 4 jack inputs for the line input and output of each channel while a separate XLR is provided for the microphone input The insert sends and returns are balanced 4 jacks The XLR connectors use the standard industry convention of pin 1 ground pin 2 positive and pin 3 negative The jacks are tip positive ring negative and sleeve ground For unbalanced use connect the ring to the sleeve When connecting a microphone set the input level control for each channel to minimum with the phantom power 48V switch off The microphone input is designed to accept the signal from low impedance balanced microphones of either dynamic ribbon or condenser types The line input is designed to accept balanced or unbalanced line level audio signals
21. t effectively reaches its shelf state A high shelf EQ boosts cuts high frequencies and a low shelf type boosts cuts low frequencies This type of circuit is very popular in hi fi systems but is also actually highly musical when applied in a recording environment In contrast a peaking equaliser is one that as its name implies has a centre frequency that is boosted or attenuated more than others The frequency range over which it reaches its peak and then falls down is known as the bandwidth or Q Because this type of design reaches a peak and then falls away it is possible with this type of circuit to home in on particular frequencies and make adjustments without affecting those around them This can be particularly useful when working with instruments such as bass guitars and snare drums By incorporating both shelving and peaking equalisers into the design of the Series 80B it is possible to get the best of both types of design Operating the Equaliser Set the input level in accordance with the procedures detailed in the Input Section section of this manual Begin with all boost cut controls those with centre detents set to their mid way 0 positions Adjust the low and high mid frequency sweep controls to their minimum positions fully anticlockwise The 50Hz high pass Filter switch should be in the out position Set the frequency select switches controlling the high and low shelving sections to 120Hz and 12kHz res
22. the low mid control extends from 100Hz up to 1 5kHz For the high mid sweep the frequency range begins at 1kHz overlapping with the low mid section and continues up to 15kHz Finally selecting the Filter switch introduces a smooth 50Hz 12dB octave roll off to effectively eliminate rumble caused by among other things someone s feet moving about near a microphone stand nearby traffic noise and AC systems The amount of boost accentuation or cut attenuation that is applied to the audio signal is entirely dependent on the programme content and it is not our intention to advise on this Application of equalisation is a very subjective matter and is best learned by experiment The equaliser bypass switch EQ is a useful facility for comparing the signal before and after the application of equalisation 10 TROUBLE SHOOTING 1 No Power Ensure the unit is selected for the correct mains voltage via the selector incorporated in the mains inlet socket on the back of the unit Check the fuse also in the mains inlet socket if the unit has been powered with the wrong voltage Check there is a mains supply reaching the unit 2 The microphone doesn t work Is it connected to the correct input on the back of the unit Is the 48V phantom power switched on for condenser microphones Is the input selected to Mic LINE switch not depressed Make sure the Mic input leve
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