Fender SRA 200 User's Manual
Contents
1. MADE IN U S A NER AMPLIFIER Professional Sound Reinforcement Amplifier OPERATION INSTRUCTION MANUAL MANUAL NO 017055 WARNING TO REDUCE THE RISK OF FIRE OR SHOCK HAZARD DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE COPYRIGHT 1979 CBS MUSICAL INSTRUMENTS A DIVISION OF CBS INC LITHO USA SRA 200 STEREO POWER AMPLIFIER OPERATION INSTRUCTION MANUAL BY EMAN MADE IN U S A Aa Professional Sound Products 9 mms LEVEL db PHYSICAL DIMENSIONS APPROXIMATE FOR SHIPPING PURPOSES U S System Metric System Weight 25 pounds 11 3 kg Width 19 inches 48 3 cm Depth 11 4 inches 29 8 cm Height 5 25 inches 13 3 cm P O BOX 4137 e 1300 EAST VALENCIA DRIVE e FULLERTON CALIFORNIA 92634 NOTE See accompanying limited warranty folder TABLE OF CONTENTS PAGE PAGE Introduction Ges ili SECTION II SECTION SETTING UP THE SYSTEM 3 SRA 200 FRONT PANEL 1 Sound System Connections 3 But ARENGO e tater 1 Speaker Placement 3 LED Peak Indicators 1 Speaker Connection 3 POWER SWILOIV re doit 1 Stereo Program Connection 3 SRA 200 REAR PANEL AT PEN OD INC 1 Monophonic Connection 4 Right Channel Output Jacks 1 Monophonic Monitor2. 350 volt amperes maximum at 120 V Ap proximately 30 volt amperes at idle Speaker Fuses 3 A 250 V quick acting Littlefuse Cat No 312003 or equivalent SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE ED WARRANTY FOLDER MADE IN U S A P O BOX 4137 1300 EAST VALENCIA DRIVE e FULLERTON CALIFORNIA 92634
3. corporated in bi amplified sound systems to realize these advantages This diagram shows the left and right program mixes fed to a two channel electronic crossover where each channelis frequency divided into low frequencies and high frequencies The left program channel s low frequency material is fed to the SRA 200 right channel input while the left pro gram channel s high frequency material is fed to the SRA 200 left channel input The SRA 200 left channel output is connected to the high frequency driver tweeter ofthe left bi amplified speaker The SRA 200 right channel output is con nected to the low frequency driver woofer of the left bi amplified speaker Similiarly the right program channel s material is processed and eventually amplified by an additional stereo power amplifier and fed to a right bi amplified speaker Stereo Bi Amplified Connection 2 Fig 8 This diagram shows a second bi amp scheme that is widely used In this stereo system one power amplifier is used to amplify only the highs and another amplifier to process the lows In most popu lar music low frequency material contains con siderably more energy than high frequency material and most sound reinforcement speaker systems have high frequency drivers which have greater ef ficiencies than their associated low frequency driv ers a result the power amplifier chosen to amplify the high frequency material need NOT be as power ful as the one chosen t
4. Connection 4 Left Channel Output Jacks 1 Stereo Bi Amplified Connection 4 FUSES han te a te ta bek ant tr ae eat an ba e an 1 Stereo Bi Amplified Connection 2 4 Right Channel input Jacks 2 Monophonic Bi Amplified Connection 4 Left Channel Input Jacks 2 SECTION CCU a je yota nana 2 Sound System Block Diagrams 5 7 Line Cord Receptacle 2 Preliminary Operating Sequence 8 Voltage Selector Switch 2 SRA 200 General Specifications 9 FIGURE Or CG LIST OF FIGURES DESCRIPTION PAGE Front Panel FUNCIONS Rest ee 1 Rear Panel Connections aussen tn re ee en Tant 2 es 3 Typical Stere Program CONNECCION a wow ann as 5 Two Channel Output From Single Source Monophonic 5 Monophonic Program Monitor Connection 6 Stereo Bi Amplified Connection bande 6 Stereo Bl Afipified CONN CHON 2 a a a an Monophonic Bi Amplified Connection 7 INTRODUCTION The Fender SRA 200 is a 100 watts per channel solid state Stereo power amplifier designed for sound reinforcement applications It is designed for standard 19 rack mounting and is ruggedly cons
5. ED Peak Indicators Fig 1 2 These LED Indicators glow red when the corres ponding power amplifier output channel is distorting due to clipping or to slew induced distortion Power Switch Fig 1 Item 3 This switch controls AC power to the SRA 200 unit The internal switch lamp glows red whenthe poweris turned on SRA 200 REAR PANEL Right Channel Output Jacks Fig 2 1 Left Channel Output Jacks Fig 2 2 Each pair of these phone jacks is wired in parallel and serves to connect each speaker enclosure toits respective output channel Total impedance of the speakers in each channel should not be less than 8 ohms Fuses Fig 2 Item 3 These fuses are connected in series with their re spective speaker jacks They protect the speakers In the event of amplifier failure and prevent damage to the amplifier caused by driving low impedance loads Each fuse is rated at 3 amperes and should be replaced only with one of the same rating and type 4 Q 5 FIGURE 1 Front Panel Right Channel Input Fig 2 4 Left Channel Input Fig 2 Item 5 These phone jacks on each channel are unbalanced and are used to connect an external signal such as that from the output of a mixer to the respective power amplifier input channel input impedance 33K ohms If only the right channel input jack is used the left channel input jack is automaticallv fed the right channel s input i
6. ement Fig 3 In order to minimize feedback in a typical stage set up the speakers should be placed forward of the microphones The speakers should be used in their normal up right position not tumed on their sides in order to take advantage of their inherent directional quality FIGURE 3 Typical Stage Setup SPEAKER CONNECTION Each output channel of the SRA 200 is designed for a minimum total load impedance of 8 ohms If the total impedance of the speakers on either channel output is less than 8 ohms the amplifier may be overloaded and cause the corresponding channel s speaker fuse to blow For example at high volume overload might occurif two 8 ohm speakers were plugged into one channel s pair of output jacks a parallel connec tion resulting in a load impedance of 4 ohms or if only one 4 ohm speaker were used Connect the speakers to the power amplifier using 18 AWG or larger unshielded wire Zip is suitable for this purpose For long runs of speaker cable over 25 feet 16 AWG or larger wire is recommended While use of a shielded guitar cable to connect the speakers will not damage the equipment a loss of volume or damage to the shielded cable may result Choose only high quality 74 phone plugs check the cables for possible short circuits an inter nal short circuit or a cracked phone plug insulator might blow a fuse in the power amplifier Stereo Program Connection Fig 4 The convent
7. ional stereo program system setup 1 illustrated in Figure 4 In this connection the program outputs of a conventional stereo mixer are fed to the corresponding channel inputs of the SRA 200 Channel outputs of the SRA 200 are then connected to their corresponding speakers The speakeron the left side of the stage should be connected to one of the left speaker output jacks on the back of the amplifier The speaker on the right side should be connected to one of the right speaker output jacks Monophonic Connection Fig 5 This shows how a monophonic signal source such as one program channel ofamixer can be used to drive both channels of the SRA 200 power amplifier in monophonic mode When a monophonic source is connected to the right channel input jack the left channel input jack is automatically fed the right channel s input information via an internal switch Monophonic Monitor Connection Fig 6 This diagram shows that if stereo program output is not necessary one channel of power amplification in the SRA 200 may be allocated to the program mate rial and the other to the monitor material In the case illustrated the left channel has been allocated to the program material and the right channel has been assigned to the monitor material Stereo Bi Amplified Connection Fig 7 A bi amplified system can provide increased head room efficiency damping factor and decreased distortion The SRA 200 Power Amplifier can be in
8. mplified Connection 1 SRA 200 STEREO POWER AMPLIFTER SOUND SYSTEM CONNECTIONS ELECTRONIC l CROSSOVER INPUT L l d SPEAKER _ L _ m l 4 mi WOOFER L HEN OO aol ADDITIONAL STEREO AMP DIR CHL IN _ 7 H FREQ R CHL FREQ our OR CHL OUT F FIGURE 8 Stereo Bi Amplified Connection 2 2 FIGURE 9 Monophonic Bi Amplified Connection PRELIMINARY OPERATING SEQUENCE NOTE If the SRA 200 is to be rack mounted care should be taken to position it so that the fuse holders and AC line cord do NOT interfere with the unit mounted directly above it This can be prevented if a unit of less depth than the SRA 200 or a spacing panel is mounted above it 1 Connect the sound system required for your specific application See Sound System Connec tions pp 5 7 2 Turn on sound system s mixer and adjust per owner s manual to proper program and monitor level outputs 3 Set both channel input attenuators Fig 1 Item 1 to their minimum level position e 4 Plug the power cord supplied into the line cord receptacle located on the rear panel Fig 2 Item 7 Do NOT remove the grounding prong the AC plug it prevents hum and possible shock If necessary use a three prong to two prong adapter Turn the power switch on Fig 1 Item 3 The swi
9. nformation via an internal switch This feature is verv beneficial in monophonic sound applications See Sound Svstem Connections Circuit Breaker Fig 2 This Circuit Breaker provides protection in the event of internal amplifier failure The breaker is reset by pushing in the red button CAUTION TOJREOUCE T RISK OF FIRE MIFLACE ONL WITH SAME TYPE 260 FUS w FHGHT CHANNEL FIGURE 2 Rear Panel Line Cord Receptacle Fig 2 Item 7 This receptacle provides connection for the detach able power cord Voltage Selector Switch Fig 2 Item 8 Export version only This switch allows selection of the following 50 or 60 Hz AC line voltages 100 120 127 220 240 260 Always turn OFF the power switch Figure 1 Item 3 before making line voltage changes Selection should be made only to the proper AC line voltage for your area TO REDUCE FRE RISK OF ELECT FE HOCK OT REMO COVERS NO USER PARTS INDE REFER SERVICING D QUALIFIED SERVICE PERSONNEL SECTION II SETTING UP THE SYSTEM SOUND SYSTEM CONNECTIONS The SRA 200 is a stereo two channel amplifier and special care must be taken in setting it up The unit contains two channels of power amplification and offers some special connections which may be ad vantageous under certain conditions The normal set up and some of the special connections are de tailed in this section Speaker Plac
10. o amplify the low frequency material In the system shown in Figure 8 the SRA 200 was chosen as the low frequency amplifier Monophonic Bi Amplified Connection Fig 9 This diagram shows how the SRA 200 can also be used independently in a monophonic bi amplified system SECTION III SRA 200 STEREO POWER AMPLIFIER _ SOUND SYSTEM CONNECTIONS LEFT L CHL OUT SPEAKER L PROGRAM CHL L CHL IN R PROGRAM CHL CHL IN RIGHT SPEAKER FIGURE 4 Tvpical Stereo Program Connection SPEAKER MONO INFO L CHL OUT L CHL IN PROGRAM CHL MONO SRA 200 R CHL IN R CHL OUT 2 MONO INFO FIGURE 5 Two Channel Output From Single Source Monophonic SRA 200 STEREO POWER AMPLIFIER SOUND SYSTEM CONNECTIONS L CHL OUT PROGRAM SPEAKER PROGRAM CHL L CHL IN MONITOR CHL R CHL IN R CHL OUT SPEAKER FIGURE 6 Monophonic Program Monitor Connection L CHL OUT H FREQ OUT L CHL IN L CHL SRA 200 L FREQ OUT R CHL IN TO TWEETER LEFT BIAMP SPEAKER SYSTEM PROGRAM CHL TO WOOFER L CHL INPUT R CHL OUT TWO CHANNEL ELECTRONIC CROSSOVER MIXER R PROGRAM CHL CHL INPUT L CHL OUT TO TWEETER H FREQ OUT L CHL IN ADDITIONAL STEREO AMP L FREQ OUT R CHL IN RIGHT BIAMP SPEAKER SYSTEM TO WOOFER R CHL R CHL OUT FIGURE 7 Stereo Bi A
11. tch s internal lamp will light up If it does not check the power cord connection and the circuit breaker Fig 2 Item 6 Adjust the volume level with the channel input attenuators Maximum permissible volume is reached when the LED peak indicators Fig 1 2 begin to flicker Beyond this point audible distortion and blown fuses may result GENERAL SPECIFICATIONS Power Output per Channel 100 watts continuous average sine wave power into 8 ohms with 007 THD at 1 kHz both channels driven 90 watts continuous average sine wave powerinto 8ohms With 0 296 THD over a bandwidth of 20 Hz to 20 kHz both channels driven Frequency Response 0 0 7 dB 20 Hz 20 kHz 0 3 0 dB 10 Hz 60 kHz Total Harmonic Distortion 007 at 100 watts 8 ohms 1 kHz 0 2 at 90 watts 8 ohms 20 Hz to 20 kHz Intermodulation Distortion 0089 using frequencies of 60 Hz 7 kHz mixed in a ratio of 4 1 single channel power output of 100 watts into 8 ohms Input Sensitivity An input of 1 28 VRMS produces an output of 100 watts into 8 ohms Input attenuator set for maximum level Input Impedance 33 K Input attenuator at max level stereo operation 00 K input attenuator at min level stereo operation Hum and Noise 102 dB signal to noise ratio Unweighted measurement reference to full power output 100 W into 80 Power Requirements 120 volts AC nominal 50 60 Hz 108 VAC minimum 132 VAC maximum
12. tructed to withstand the physical abuse often encountered in road travel Unique fast act ing LED Indicators show the operator when actual clipping occurs rather than simply indicating a near clipping level In addition they inform the operator when the unit is operating with large amounts of slew induced distortion present in the output The SRA 200 incorporates detented input attenuators with 22 steps calibrated in dB These input attenuators allow for predictable and repeatable set ups accurate input sensitivity adjustments and precise channel tracking Each channel employs aFET controlled turn on turn off muting circuit alow noise high slew rate operational amplifier and four rugged NPN output transistors mounted on conservatively designed heatsinks The SRA 200 features protective circuits such as output transistor ther mal cutout fast action speaker fuses power transformer thermal cutout and primary circuit breaker making it practically abuse proof The following pages of this manual detail the functions of the various controls and jacks and use of the SRA 200 in a professional sound system BEFORE ATTEMPTING TO USE THE UNIT FAMILIARIZE YOURSELF WITH THE INFORMATION CONTAINED IN THIS MANUAL SECTION I SRA 200 FRONT AND REAR PANELS SRA 200 FRONT PANEL Input Attenuators 1 Item 1 These calibrated stepped Input Attenuators lower input signal levels to their respective channels ahead of amplification stages L
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