Page 2 - WORLDWIDE; NORTH AMERICA; THREE YEAR
WORLDWIDE SUMMARY OF WARRANTY The Crown Audio Division of Crown International, Inc., 1718 WestMishawaka Road, Elkhart, Indiana 46517-4095 U.S.A. warrants to you,the ORIGINAL PURCHASER and ANY SUBSEQUENT OWNER of eachNEW Crown 1 product, for a period of three (3) years from the date of purchase by th...
Page 3 - Crown Audio Division Technical Support Group; IMPORTANT; WATCH FOR THESE SYMBOLS:; C A U T I O N; A V I S; WARNING
The information furnished in this manual does not include all of the details of design, production, or variations of theequipment. Nor does it cover every possible situation which may arise during installation, operation ormaintenance. If your unit bears the name “Amcron,” please substitute it for t...
Page 4 - Studio Reference; Professional Studio Amplifiers; CONTENTS
Page 4 Studio Reference IIIII & II II II II II Professional Studio Amplifiers CONTENTS 1 Welcome .......................................................................... 7 1.1 Features ................................................................... 7 2 Facilities .............................
Page 5 - ILLUSTRATIONS; II
Page 5 Studio Reference IIIII & II II II II II Professional Studio Amplifiers ILLUSTRATIONS 1.1 Studio Reference I Amplifier ........................................... 6 2.1 Front Facilities ................................................................. 8 2.2 Rear Facilities ...................
Page 6 - Unpacking Instructions; NEVER SHIP; Amplifier
Page 6 Studio Reference IIIII & II II II II II Professional Studio Amplifiers Unpacking Instructions Please unpack and inspect your new amplifier forany damage that may have occurred during transit.If damage is found, notify the transportation com-pany immediately. Only you, the consignee, may i...
Page 7 - Welcome
Page 7 Studio Reference IIIII & II II II II II Professional Studio Amplifiers 1 Welcome The stunning realism you will experience when listen-ing to a Crown Studio Reference ™ amplifier will redefine your expectations. The evolution of this studiostandard ushers in a new era of powerful, ultraqui...
Page 8 - Facilities; ODEP Indicators; During normal operation of the amplifier, the; IOC Indicators; The; D. Signal Presence Indicators; See; Meter Switches
Page 8 Studio Reference IIIII & II II II II II Professional Studio Amplifiers 2 Facilities A. Level Controls Each channel’s output level can be adjusted accuratelyusing the 31-position detented level controls on the frontpanel (see Section 4.4). B. ODEP Indicators During normal operation of the ...
Page 9 - Studio; L. Balanced XLR Inputs; O. Balanced Phone Jack Inputs; Do not use the channel 2 input in either mono mode.; P. Ground Lift Switch
Page 9 Studio Reference IIIII & II II II II II Professional Studio Amplifiers I. Reset Switch This back panel switch can be used to trip and reset theAC mains circuit breaker (see Section 4.3.4). J. Power Cord For 120 VAC, 60 Hz North American units, the Studio Reference I includes a 10 AWG powe...
Page 10 - Installation
Page 10 Studio Reference IIIII & II II II II II Professional Studio Amplifiers 3 Installation 3.1 Mounting Studio Reference amplifiers are designed for standard19 inch (48.3 cm) rack mounting or stacking without acabinet. In a rack, it is best to mount units directly ontop of each other. This pr...
Page 11 - can; If your; STEREO MODE; Reference
Page 11 Studio Reference IIIII & II II II II II Professional Studio Amplifiers Fig. 3.5 Stereo Wiring you may want to install supplemental cooling like arack-mounted blower or an air conditioner. A “squirrel cage” blower can be installed at the bottomof the rack so it blows outside air into the ...
Page 12 - This practice reduces the chance of
Page 12 Studio Reference IIIII & II II II II II Professional Studio Amplifiers making connections, selecting sources and controllingoutput levels. The load you save may be your own!Crown is not responsible for damaged loads that resultfrom carelessness or deliberate overpowering. CAUTION: Always...
Page 14 - The amplifier’s built-in; Fig. 3.10 Balanced and Unbalanced Phone Plugs; Twin-lead shielded cable
Page 14 Studio Reference IIIII & II II II II II Professional Studio Amplifiers 3.3.4 Input Connection The balanced inputs have a nominal impedance of10 K ohms (5 K ohms unbalanced) and will accept theline-level output of most devices. Phone jacks are pro-vided on the back panel, while the factor...
Page 15 - subsonic; Input Wiring Tips; ground loops; quencies
Page 15 Studio Reference IIIII & II II II II II Professional Studio Amplifiers S O L V I N G I N P U T P R O B L E M S Sometimes large subsonic (subaudible) frequencies are present in the input signal. These can damageloudspeakers by overloading or overheating them. Toattenuate such frequencies,...
Page 16 - lation; from the load current flowing in the loop. To; Use Good Connectors
Page 16 Studio Reference IIIII & II II II II II Professional Studio Amplifiers power cables and power transformers. We also recom-mend using shielded or twisted pair wire. With loosewires, use tie-wraps to bundle together each pair of in-put wires. This helps reduce magnetically-inducedcurrent b...
Page 17 - subsonic currents; IQ System is often used so; High frequency oscillations
Page 17 Studio Reference IIIII & II II II II II Professional Studio Amplifiers amplifiers share a common cable tray or jacket,use tie-wraps to bundle individual conductors sothe wires for each loudspeaker are kept closetogether. (Do not bundle wires from differentamplifiers.) This reduces the ch...
Page 19 - Operation; Turn off the amplifier and unplug it from the AC; able indicator
Page 19 Studio Reference IIIII & II II II II II Professional Studio Amplifiers 4 Operation 4.1 Precautions Although your amplifier is protected from internal andexternal faults, you should still take the following pre-cautions for optimum performance and safety: 1. Improper wiring for the Stereo...
Page 20 - Protection Systems; ODEP, standby mode, an AC circuit breaker; signal presence indicators; dynamic range / level meters; Fig. 4.2 Studio Reference Indicator States
Page 20 Studio Reference IIIII & II II II II II Professional Studio Amplifiers As dynamic range meters they show each channel’sratio of peak-to-average power in dB. The dynamicrange may be low for sources like AM/FM radio or low-quality recordings. Other sources like live music orhigh-quality re...
Page 22 - enable switch; AMPLIFIER TOP VIEW
Page 22 Studio Reference IIIII & II II II II II Professional Studio Amplifiers former than in the output devices. This can overheatthe transformer and activate its protection system. Studio Reference amplifiers are designed to keep work-ing under conditions where other amplifiers would fail.But ...
Page 23 - input sensitivity switch; ground lift switch
Page 23 Studio Reference IIIII & II II II II II Professional Studio Amplifiers Fig. 4.5 Input Sensitivity and Ground Lift Switches Fig. 4.4 Meter Switches ® METER ON/OFF SWITCH ON OFF DYNAMIC RANGE OUTPUT LEVEL METER MODE SWITCH 0.775 V 1.4 V SENSITIVITY SWITCH INSIDE ACCESS HOLE 2 6 d B UNBALAN...
Page 24 - Technical Information; Studio Reference ampli-
Page 24 Studio Reference IIIII & II II II II II Professional Studio Amplifiers 5 Technical Information 5.1 Overview Studio Reference amplifiers incorporate several newtechnological advancements including real-time com-puter simulation of output transistor stress, low-stressoutput stages, an adva...
Page 27 - Specifications; Performance; voltage and current; Controls
Page 27 Studio Reference IIIII & II II II II II Professional Studio Amplifiers 6 Specifications The following applies to units in Stereo mode with 8 ohm loadsand an input sensitivity of 26 dB gain unless otherwise specified. Low-Distortion 1 kHz Power: refers to maximum average power in watts at...
Page 28 - Meter Display Mode:; Indicators
Page 28 Studio Reference IIIII & II II II II II Professional Studio Amplifiers Sensitivity: A three-position switch inside the P.I.P. com- partment used to select the input sensitivity for both chan-nels: 0.775 or 1.4 volts for standard 1 kHz power, or a 26dB voltage gain. Meter On/Off : A two-p...
Page 29 - Crown specifications are guaranteed for three years.; Mode; Stereo
Page 29 Studio Reference IIIII & II II II II II Professional Studio Amplifiers Crown specifications are guaranteed for three years. In an effort to provide you with as much information as possible about the high power-producing capabilities of your amplifier,we have created the following power m...
Page 31 - Maximum Power Specifications
Page 31 Studio Reference IIIII & II II II II II Professional Studio Amplifiers Fig. 6.3 Studio Reference I Maximum Power Matrix Maximum Power Specifications Crown’s maximum power specifications represent the largest amount of output power you can expect from your ampli-fier when it is driven to ...
Page 36 - AC Power Draw and; Studio Reference amplifiers and the amount of heat
Page 36 Studio Reference IIIII & II II II II II Professional Studio Amplifiers 7 AC Power Draw and Thermal Dissipation This section provides detailed information about theamount of power and current drawn from the AC mainsby Studio Reference amplifiers and the amount of heat produced under vario...
Page 38 - Accessories; FTE; AMC; EDC
Page 38 Studio Reference IIIII & II II II II II Professional Studio Amplifiers 8 Accessories 8.1 P.I.P. Modules One advantage of Studio Reference amplifiers is the ability to customize them using P.I.P. (Programmable In- put Processor) modules. Each amplifier is equipped withan edge card connect...
Page 39 - ISO; ATN; XOV; FXT; RPA
Page 39 Studio Reference IIIII & II II II II II Professional Studio Amplifiers pressors, it only compresses the signal to prevent over-load. It can deliver up to 13 dB of additional headroomwithout being noticeable. ISO ProgrammableInput Processor (P.I.P.) —WARNING — THIS P.I.P. PROVIDES FULL IS...
Page 40 - Service; Worldwide Service; Service at a North American Service Center; Crown Audio Division
Page 40 Studio Reference IIIII & II II II II II Professional Studio Amplifiers 9 Service This unit has very sophisticated circuitry which shouldonly be serviced by a fully trained technician. This isone reason why each unit bears the following label: CAUTION: To prevent electric shock, do not re...
Page 41 - Crown Factory Service Information; NATURE OF PROBLEM; If warranty has expired, payment will be:; ENCLOSE THIS PORTION WITH THE UNIT. DO NOT MAIL SEPARATELY.
Page 41 Studio Reference IIIII & II II II II II Professional Studio Amplifiers Crown Factory Service Information Shipping Address: Crown International, Inc., Factory Service, 57620 C.R. 105, Elkhart, Indiana 46517 Phone: 1-800-342-6939 or 1-219-294-8200 Fax: 1-219-294-8301 Owner’s Name: ________...
