TRUE systems PRECISION 8i 8-CHANNEL PRECISION MICROPHONE PREAMPLIFIER with M/S decoding and Direct Inputs OPERATION MANUAL Version 1.
SAFETY and OPERATING PRECAUTIONS Important Information: This symbol indicates the presence of dangerous voltage within the product enclosure that presents the risk of electric shock injury. When this symbol appears next to an operation discussed in this manual, only qualified technical personnel should perform that operation. This symbol indicates important operating or maintenance instructions that should be read carefully.
CERTIFICATIONS Declaration of Conformity – CE Sunrise Engineering and Design Inc. hereby declares the TRUE Systems PRECISION 8i 8-channel microphone preamplifier to be in material conformity with the following directives and related standards: 73/23/EEC – Low Voltage Directive 89/336/EEC – EMC Directive EN60065:1998 EN55103-1: 1997 EN55103-2: 1997 Technical files are maintained at corporate headquarters of Sunrise Engineering and Design Inc., 1634 S.
PRECISION 8i OPERATION MANUAL CONTENTS SAFETY and OPERATING PRECAUTIONS 2 CERTIFICATIONS 3 Owner’s Record 3 Table of Contents 4 INTRODUCTION 5 PRODUCT OVERVIEW 5 UP-AND-RUNNING IN A HURRY 6 INSTALLATION 7 7 8 8 Unpacking and Inspection Mounting Ventilation OPERATION Connections AC Mains Connection Output Cable Connection Microphone Cable Connection A Word About Cables Front Panel Controls More About M/S Decoding 8 8 8 10 11 11 12 14 DESIGN APPROACH 16 SPECIFICATIONS 16 TROUBLESHOOTI
PRECISION 8i OPERATION MANUAL INTRODUCTION The PRECISION 8i is designed to provide the detailed, transparent sonic performance necessary for the most critical direct tracking and live sound applications. It includes a unique combination of functions that make it useful as a complete input system for standalone or PC-based recording systems. And, the PRECISION 8i has special features that provide the serious musician or recordist with useful tools to get the best sound more quickly and easily.
PRECISION 8i OPERATION MANUAL UP-AND-RUNNING IN A HURRY 1. Read the “Safety and Operating Precautions”on page 2 of this manual. 2. Check the voltage selector on the International Power Supply Module (PSU-P8i) to make sure it is set for the appropriate AC mains voltage in your area. 3. After making sure the main power switch is off, connect the AC power cord. 4. Connect output signal cables between PRECISION 8i and the analog line level inputs of your recorder, mixer, signal processor, etc.
PRECISION 8i OPERATION MANUAL About the Level and Peak-Hold Indicators: 1. SIG indicates that a signal is present on the channel. It illuminates when the signal level exceeds -24dBu. 2. +4 illuminates when the output signal reaches normal operating level of +4 dBu. 3. OL illuminates when the signal level exceeds +26 dBu, which is 5 dB below the overload point for the Precision 8i. 4.
PRECISION 8i OPERATION MANUAL Mounting The PRECISION 8i is designed for conventional rack mounting, or stand-alone mounting by use of the adhesive rubber feet supplied. Avoid locating the unit next to equipment that emits strong electromagnetic fields. If the unit is to be permanently mounted in a high-vibration environment, you may wish to provide additional side or rear support to prevent possible distortion of the mounting ears.
PRECISION 8i OPERATION MANUAL To change the AC operating voltage selection: This procedure should be performed only by qualified technical personnel. If you are not qualified, please consult TRUE Systems or your dealer for assistance. 240 2 1 1) Using an appropriate AC voltmeter, measure the AC line voltage at the installation site. 2) Make sure the AC power cord is disconnected from the PSU-P8i Power Supply Unit.
PRECISION 8i OPERATION MANUAL must be of the same type. AC mains power cord must be removed to gain access to Fuse Drawer 1 for fuse replacement. 3 4 TRUE Systems - Precision 8i Sunrise Engineering and Design Inc. Tucson, Arizona USA LINK CONNECT ONLY PSU-P8i 7 5 3 1 8 6 4 2 DO NOT DISCONNECT WITH AC POWER ON S/N 1-8 (4-40) BALANCED OUT Signal Ground Connection: LINK 3 connects signal ground to earth ground. Signal ground is isolated from earth ground if the LINK jumper is removed.
PRECISION 8i OPERATION MANUAL 5 6 MIC 8 MIC 7 Direct In 2 Direct In 1 MIC 6 MIC 5 MIC 4 MIC 3 MIC 2 MIC 1 PIN 2 + PIN 3 - MS Microphone Connection: Microphone connection is made to standard XLR receptacles on the rear panel. The wiring configuration used for the microphone connectors on the PRECISION 8i is: Pin 2 is positive (+) Pin 3 is negative (-) Pin 1 is shield Do not attempt to connect unbalanced microphones (with single-pin connectors) to the PRECISION 8i.
PRECISION 8i OPERATION MANUAL Use high-quality, low capacitance cable. Braided shielding and “star quad” type mic cables will perform better in electrically noisy environments. Manufacturers such as Canare, Mogami (and others) make high performance cable of this type. Some “house brand”cables are made by quality manufacturers, but others can be inferior. Be careful. Use cables with high-quality connectors (Neutrik, Switchcraft, etc.).
PRECISION 8i OPERATION MANUAL 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 exceeded the level selected on the PEAK REFERENCE switch. Note that the overload level of the PRECISION 8i is +31dBu at the output.
PRECISION 8i OPERATION MANUAL 9 PEAK 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.
PRECISION 8i OPERATION MANUAL Drum kits: use an M-S pair for drum overhead micing. Vocal and instrumental ensembles: use M-S to give realistic perspective to backup vocals or instrumental groups. Individual instruments or vocals: try M-S on acoustic guitar and in situations where you wish to capture room ambience. Broadcast/film sound: use M-S to capture audience noise or background ambience. M-S can also be used in TV and film work to match the sonic image width to the visual image width.
PRECISION 8i OPERATION MANUAL DESIGN APPROACH PRECISION 8i features a high-voltage composite architecture with discrete devices plus integrated circuits. The totally balanced, dual servo, dc-coupled design provides exceptional transient response, headroom, imaging and noise performance. Critical devices have been selected on the basis of extensive listening tests as well as engineering tests. Military grade, hand-matched components are utilized in critical circuit areas.
PRECISION 8i OPERATION MANUAL TROUBLESHOOTING T Solution Symptom No signal output. Main power switch Check AC power source and cord. is on, but no LED’ s are illuminated. Check fuses (pull fuse drawer next to power cord inlet) No signal output. Main power switch Check status of phantom power. is on and green power LED is Check continuity of mic and illuminated. instrument cables. Check continuity of output cables. electric Output signal is distorted.
PRECISION 8i OPERATION MANUAL Channel 1 signal can be heard in Check status of M-S selector. It should be Channel 2 output - and vice versa. “out”for individual channel mode and “in”for Mid-Side mode. Channel 2 seems to have no output Check status of M-S selector. It should be when used with Channel 1 as a “out”for individual channel mode and “in”for stereo pair Mid-Side mode. Make sure the selectors for both Channels 1 and 2 are “out”.
PRECISION 8i OPERATION MANUAL repaired or replaced at the manufacturer’ s option, free of charge. Supplementary shipping charges will apply to units returned to addresses outside the continental USA. All units returned to SUNRISE or authorized TRUE systems repair facility must be prepaid, insured and properly packaged. Purchaser must obtain a Return Authorization (RA) number from SUNRISE prior to returning a product.