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TRUE

TRUE

systems

PRECISION 8

8-CHANNEL PRECISION MICROPHONE PREAMPLIFIER with M/S decoding

and Direct Inputs

OPERATION MANUAL

Version 1.5

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Summary of Contents for PRECISION 8

Page 1: ...TRUE TRUE systems PRECISION 8 8 CHANNEL PRECISION MICROPHONE PREAMPLIFIER with M S decoding and Direct Inputs OPERATION MANUAL Version 1 5 ...

Page 2: ...ensing moisture Liquid entering the product enclosure presents the risk of electric shock injury Do not touch the AC plug or enclosure with wet hands Do not defeat intended AC power connection polarization Do not use a damaged or excessively worn cord to connect this unit to AC power CAUTIONS Severe damage may be caused to your unit if it is connected to an AC power source other than 120VAC 60Hz S...

Page 3: ...esign Inc 8175 E Slate Ridge Drive Tucson Arizona 85715 USA Owner s Record We recommend that you record the following information for reference in the event that you need to contact TRUE Systems TRUE Systems for technical support or repairs Please return your completed Warranty Card today Serial No _____________________ Purchase Date ______________________ Dealer __________________________________...

Page 4: ... IN A HURRY 6 INSTALLATION 7 Unpacking and Inspection 7 Mounting 7 Ventilation 8 OPERATION 8 Connections 8 AC Mains Connection 8 Output Cable Connection 8 Microphone Cable Connection 9 A Word About Cables 10 Front Panel Controls 11 More About M S Decoding 13 DESIGN APPROACH 15 SPECIFICATIONS 15 TROUBLESHOOTING 16 REGISTRATION and WARRANTY 17 SERVICE and SUPPORT INFORMATION 18 ...

Page 5: ...uments and keyboards The 5 segment peak hold level metering with selectable peak reference allows rapid optimization of program levels between the PRECISION 8 and devices to which it is interfaced Dual output connections provide easy interconnection as well as the ability to act as a mic splitter PRECISION 8 is ideal for location recording due to its compact 1U rack size 8 channel format useful le...

Page 6: ...ctric instrument input 1 Connect your instrument cables to Direct In 1 and Direct In 2 on the rear panel The Direct In jacks are located within the same connectors as MIC 7 and MIC 8 Simply plug your 1 4 phone plug into the center portion of the desired connector NOTE DO NOT use TRS plugs for these inputs as the DI will not function correctly 2 Set φ φ buttons as appropriate 3 Adjust DI 1 or DI 2 ...

Page 7: ...ntom power transients to activate the PEAK HOLD indicators Simply depress RESET to clear the indicators INSTALLATION Unpacking and Inspection We recommend that you inspect your PRECISION 8 upon unpacking it from the factory shipping carton In the unlikely event that the unit exhibits any physical damage DO NOT connect it to the AC mains power but contact your dealer immediately In addition to the ...

Page 8: ...n Prior to connecting the AC mains power cord to the Precision 8 verify that the AC mains voltage in your area is nominally 120VAC 60Hz This insures that the Precision 8 will operate according to specifications To provide continued protection against fire replacement fuses should be only of the types listed on rear panel T 315mA L 250V Product damage caused by incorrect voltage settings or fuse se...

Page 9: ...is will result in audible distortion The wiring configuration used for the output connectors on the Precision 8 is For TRS Tip is positive Ring is negative Sleeve is shield For DB25 This output connector is wired according to the Tascam 8 channel analog wiring configuration DO NOT USE TDIF CABLES Microphone Connection MIC 1 MIC 2 MIC 3 MIC 4 MIC 5 MIC 6 MIC 7 MIC 8 Direct In 1 Direct In 2 MS PIN 2...

Page 10: ...e inputs as the DI will not function correctly M S mid side Microphone Connection You may note the M S mid side connection symbol below the MIC 1 and MIC 2 connectors 4 This is simply a visual reminder when using an M S mic setup to connect the MID mic to channel 1 and the SIDE mic to channel 2 See the section More About M S Decoding for more information A Word About Cables Most users of the Preci...

Page 11: ...the PEAK REFERENCE selector 9 The 3 indicator activates at peak level minus 3 dB The 6 indicator activates at peak level minus 6 dB Generally the PEAK REFERENCE selector is set for the maximum level you want to present to your mixing console recorder etc Depress RESET 10 to clear PK NOTE Only the OL light indicates impending preamp overload The red PK light simply indicates that the signal has exc...

Page 12: ... REFERENCE selector This sets the level at which the Peak Hold indicators 4 activate It also changes the operating level indication 6 to 10 dBV operation when the 10 dBV position is selected 10 Peak Hold reset RESET clears the peak hold indicators on all channels NOTE It is normal for the Peak Hold indicators to activate when phantom power is applied when AC power is applied or when a new setting ...

Page 13: ...nd production But there is another significant benefit varying the gain of the Side mic in relation to the Mid mic causes a variation in the stereo image from none to extreme separation It is not necessary to change the angle or position of the microphones in order to change the stereo image This feature can really speed up the time consuming process of finding a sweet spot that provides both good...

Page 14: ...u wish to configure the unit for this mode proceed as follows WARNING ELECTRIC SHOCK HAZARD Dangerous voltage exists inside the enclosure of this product This operation should only be performed by qualified personnel NEVER open the product enclosure while the AC power cord is attached Disconnect AC power cord Remove the twelve screws securing the top cover to the enclosure Remove the cover Locate ...

Page 15: ...it areas These design features result in the transparent detailed sound quality for which TRUE preamps have become known SPECIFICATIONS Gain preamp 15 5 to 64dB DI 4 to 44dB Frequency Response 1 5 Hz to 500kHz 3dB gain 40dB Maximum Output Level 31 dBu Maximum Input Level 15 dBu Noise Rs 0 Ohms 132 dB e i n Slew Rate 40 V uS CMRR CMV 10 dBu 85 dB THD preamp 26dBu 100kOhm 0008 Input Impedance preamp...

Page 16: ...ce or monitoring system to which it is connected Set PEAK REFERENCE selector to match capability of device or monitoring system then adjust gain according to indications on the Peak Hold LEDs Check continuity of output cable Make sure outputs are not connected to a load impedance of less than 600 ohms Output signal is distorted Outputs are connected for unbalanced operation Make sure the minus out...

Page 17: ...connected to the Direct Input Make sure that the instrument cables have standard tip sleeve 1 4 phone plugs DO NOT use TRS plugs Radio Frequency Interference can be heard in the audio program swishing sound or audio from a radio transmitter Make sure that mic cables are of good quality and that the shield is properly connected Avoid excessive length Make sure that earth ground connection is mainta...

Page 18: ...ll SUNRISE be held liable for any special indirect incidental or consequential damage or for injury loss or damage sustained by any person or property that may result from the use of or failure of this product to operate correctly at any time In the USA some states do not allow the exclusion or limitation of implied warranties or liability for incidental or consequential damage so the previous exc...

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