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TRUE

systems

PRECISION 8i

8-CHANNEL PRECISION MICROPHONE PREAMPLIFIER with M/S decoding

and Direct Inputs

OPERATION MANUAL

Version 1.2

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Summary of Contents for PRECISION 8i

Page 1: ...TRUE systems PRECISION 8i 8 CHANNEL PRECISION MICROPHONE PREAMPLIFIER with M S decoding and Direct Inputs OPERATION MANUAL Version 1 2 ...

Page 2: ...g 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 the AC voltage setting is not correct for the AC power available in your area The voltage setting is visible on the AC inlet module on the International Power Supply Module PSU P8i S...

Page 3: ... at corporate headquarters of Sunrise Engineering and Design Inc 1634 S Research Loop Suite 110 Tucson Arizona 85710 USA Owner s Record We recommend that you record the following information for reference in the event that you need to contact TRUE Systems for technical support or repairs Please return your completed Warranty Card today Serial No _____________________ Purchase Date ________________...

Page 4: ... IN A HURRY 6 INSTALLATION 7 Unpacking and Inspection 7 Mounting 8 Ventilation 8 OPERATION 8 Connections 8 AC Mains Connection 8 Output Cable Connection 10 Microphone Cable Connection 11 A Word About Cables 11 Front Panel Controls 12 More About M S Decoding 14 DESIGN APPROACH 16 SPECIFICATIONS 16 TROUBLESHOOTING 17 REGISTRATION and WARRANTY 18 SERVICE and SUPPORT INFORMATION 19 ...

Page 5: ...nd keyboards The 5 segment peak hold level metering with selectable peak reference allows rapid optimization of program levels between the PRECISION 8i 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 8i is ideal for location recording due to its compact 1U rack size 8 channel format useful level me...

Page 6: ...the level indicators of the device to which it is connected If you re using the DI s for electric 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 a...

Page 7: ...ors for all channels It is normal for power on transients and phantom 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 8i 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 m...

Page 8: ... Ventilation We recommend that you provide adequate ventilation so that the air temperature surrounding the unit does not exceed 55 C 122 F If multiple units are to be mounted in a poorly ventilated rack or travel case a 1 3 4 blank space should be located after every two units two units mounted together blank space two more units etc OPERATION Connections PSU P8i 240 1 AC Mains Connection Prior t...

Page 9: ...a small screwdriver or similar tool remove the Voltage Selector 2 5 Rotate the Voltage Selector to the appropriate position for the AC voltage measured in Step 1 above See Table below for proper Voltage Selector setting Select the setting that places your measured voltage nearest the middle of the Operating Voltage Range Voltage Selector Operating Voltage Range Fuses 2 ____ 100V 90 110VAC 50 60Hz ...

Page 10: ...ltaneously to connect to Line Inputs on mixing consoles recorders etc If both pairs of outputs are used care should be taken to avoid system ground loops See Troubleshooting section for tips on avoiding hum caused by grounding problems The DB25 and TRS output connectors are not electronically isolated Therefore if you chose to connect either one of the output connectors to an unbalanced input the ...

Page 11: ...onnected to its outputs not to mention your ears Electric Instrument Connection Dual purpose input connectors 5 are available on channels 7 and 8 Insert XLR microphone connector for normal MIC 7 and MIC 8 operation Insert 1 4 phone plug for use as Direct Input for instruments DI 1 and DI 2 DI 1 and DI 2 are controlled by Gain and phase controls for channels 7 and 8 respectively The gain range for ...

Page 12: ...polarity is reversed when the button is depressed 2 Phantom power selector Phantom power 48V is activated when the 48V button is depressed Avoid selecting phantom power if you are using a ribbon microphone While not required it is advisable to de select 48V when using a dynamic microphone or a DI input 3 Overload warning indicator OL illuminates and holds at 26 dBu which is 5 dB below actual overl...

Page 13: ...n applications where this is necessary Please consult the factory for assistance 5 Signal Present indicator The SIG indicator activates at approximately 24 dBu 6 Operating level indicator The 4 indicator activates when the output level reaches 4 dBu normal operating level When the PEAK REFERENCE selector 9 is set to the 10 dBV position the operating level indicator activates at 10 dBV output level...

Page 14: ...What is M S It is a stereo microphone placement technique that uses a center forward facing omni or cardioid mic Mid and a side facing figure 8 mic Side The signals from these two mics are passed through matrix circuitry that combines them in particular phase and level relationships to produce a stereo L and R output What good is M S versus the typical XY microphone placement Originally M S was us...

Page 15: ...il RESET is depressed This mode can be helpful in live sound and recording applications where the PRECISION 8i is remotely located from the device s to which it is connected Jumpers inside the unit select this optional mode If you 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 sh...

Page 16: ...E 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 5 5 kOhm DI 2 5 Mohm Power Consumption 44W Preamp Enclosure Dimensions 17 5 in 44 5 cm W 13 ...

Page 17: ...ading the device 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...

Page 18: ...nected 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 maintaine...

Page 19: ...o event shall 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 p...

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