On Point Audio OPA-151SA User Manual
Contents
1. OPA Net offers 5 bands of fully programmable equalization The filter type gain frequency and filter Q may all be set for each of the 5 bands 5a The filter type may be set by clicking on the box directly above the gain indicator as shown above The selections are Bell standard parametric Hi Shelving and Low Shelving m EQ Filters 5b The filter gain may be set by holding the left mouse click down and then the slider up or down The gain in dB will be displayed immediately above the slider in the Gain box EQ Filters shape Gain dE oc The center frequency in the case of a bell filter parametric or corner frequency in the case of a High Shelf or Low Shelf may be set by left clicking on the Frequency back spacing to erase the current frequency and then entering the desired center frequency or corner frequency EC Filters Bell Bell Bell Bell Flat Pn an TE sn Syn ass i pass bynes Bypass 5d The Q of the bell filter or shelving filter may be adjusted by either step clicking the left mouse button or by left clicking and holding the mouse button down The Q range is from 0 5 to 10 Clicking the right facing arrow will increase the Q and clicking on the left facing arrow will decrease the Q As a reference a quick conversion of Q to bandwidth in octaves is Q Bandwidth Octaves 0 5 2 54 1 0 1 40 1 4 1 0 2 9 0 5 4 3 0 33 ie 1 3 oct 10 0 0 142. 5 systems WARNING Only the OPALine 82 is designed to be speaker pole mounted on the OPA 151SA Use the PSA 82 pole adaptor and bracket when speaker pole mounting the OPALine 82 on the OPA 151SA Information about the PSA 82 can be found on the On Point Audio web site The OPA 8NP OPA 28NP and OPA 5 are NOT designed to be speaker pole mounted on the OPA 151SA Frequency Response Coverage Pattern Input Thru Power Peak Total System Continuous Total System AC Mains Power Universal Input to achieve rated output Max Acoustic Output Peak Supplied Accessories Dimensions H X W X D Weight Operating temperature C F Specifications 40 Hz 150 Hz Essentially omnidirectional 3 Pin XLR type Pin 2 2 000 Watts 1000 W to Sub and 1000W to top box 1 000 Watts 500 W to Sub and 500W to top box 115 V AC to 230 V AC Min 85V AC Max 265 V AC 50 Hz 60 Hz 0 774 V RMS 131 dB AC Mains Cable RS 485 Cable OPA Net software 530mm x 420mm x 598 1mm 20 87 x 16 54 x 23 55 30 8 kg 68 Ib 0C 43C 32F 110F NOTE Max Acoustic Output is based on smoothed system response not peak driver response The image below shows the OPA 151SA with two OPALine 82 enclosures using the PSA 82 speaker pole adaptor and TBEC 82 coupling bracket Read all of the instructions included in this manual Copies of this manual should be retained by both the system installer an
3. B SIGNAL CLIP OPA Net PRE SET EQ LINE INPUT OPA Net input The first screen to display is the Configure ID Device screen as shown below Configure ID Device RS485 Connection with one device The simplest selection is to highlight with one device as shown above Now click the Search COM button on the window shown above The Search function will determine which COM port the USB connector is plugged in to and set the com port for that address automatically For typical applications where only one OPA 151SA is being used the ID Select will be the value 1 After the OPA Net communications have been established the next screen that will appear is shown below The ID List will populate with the devices that the OPA Net software detects To access a device simply double click on the desired device ID List o x The main OPA Net screen will now appear as shown below All of the allowable parameters are now available for modification recall saving or monitoring udu 7 O 2 The set up process should be as follows 1 Source selection select either the analog input or noise generator Note Ensure that the noise generator level is fully attenuated prior to selecting this source The normal selection is the analog input The noise generator may be used for system eq Source selection 2 DLF selection DLF is adynamic loudness filter The dynamic loudness compensation c
4. RS 485 cable for remote programming of selected features of the OPA 151SA DSP based pre amplifier 3 OPA 151SA AC mains cables 120VAC or 230VAC 4 OPA Net installation CD ROM A WHEN USING THE PSA 82 POLE ADAPTOR WITH THE OPA 151SA THE OPA 151SA ENCLOSURE MUST BE PLACED ON A LEVEL SURFACE DO NOT USE THE POLE IF THE GROUND S SURFACE IS NOT LEVEL FEATURES AND APPLICATIONS The OPA 151SA is a professional product and is designed to be used with a high quality mixing console The OPA 151SA includes factory preset crossover and equalization functions Additional equalization and delay settings are user programmable via a PC and the supplied RS 485 cable Any additional equalization functions attempted in via a mixing console or outboard EQ device should be very carefully applied in order to prevent input overload and signal clipping in the OPA 151SA pre amp The OPA 151SA features an onboard digital signal processor DSP that performs analog to digital conversion equalization high order crossover delay and system dynamics processing The system s dynamics processing consists of a compressor limiter function designed to provide both ultra fast threshold system protection and maximized system dynamics SETUP AND USE OF THE OPA 151SA AC MAINS CONNECTION Prior to connecting the AC mains cable please ensure that the AC mains switch on the OPA 151SA is in the OFF position Speaker Level High Pass Output Beware High Volta
5. This feature allows the user to name the OPA Net preset used in a specific installation or environment USING THE OPA 151SA Application and Trouble Shooting Tips The OPA 151SA is a high quality professional sound reinforcement system designed for use in indoor applications Some basic precautions will insure long term reliability EQUALIZATION The OPA 151SA has all the required equalization functions included in the internal Digital Signal Processor DSP All equalization and gain functions have been optimized for flat frequency response and maximized system dynamics Care should be taken to insure that external gain and EQ user settable gain and EQ and fixed internal EQ and gain to do not sum to produce signal clipping If clipping or distorted sound is heard then gain eq must be reduced The gain function on the OPA 151SA should be set to ensure the desired acoustic response and output of the system Care should be taken when setting the gain of the OPA 151SA and the gain of the mixing console to insure that the gain of the external mixing console is not turned too high and induce clipping and overload in the OPA 151SA The mixing console should be capable of providing sufficient output signal levels to supply the necessary voltage levels to drive the OPA 151SA to full power and still insure adequate headroom in the mixing console The OPA 151SA will produce full power with a 0 774 V RMS OdBu input signal If additional equali
6. observe the same polarity when replacing the woofer The OPA 151SA has been tested to the following standards EN55013 2013 EN55020 2007 A11 2011 EN61000 3 2 2006 A2 2009 EN61000 3 3 2013 EN60065 2002 A1 2006 A11 2008 A2 2010 A12 2011 2015 On Point Audio Nashville TN 37215 U S A www onpointaudio com One Systems Inc www onesystems com
7. INPUT GAIN an OPA Net LINE INPUT Parallel Output Input The Line Input connector should be used for the MAIN full range audio input signal The Parallel output is used to parallel the input signal to other powered loudspeaker enclosures All full range input material is high pass filtered in the system DSP The low frequency material is routed to the internal high power 15 inch woofer The high frequency material is routed to the Speaker Level High Pass Output found near the AC mains switch This output directs all signal content above the program selected high pass filter frequency to the selected top enclosure OPALine 28 OPA 5 OPA 8NP or OPA 28NP Any professional grade XLR to XLR cable may be used for the line level input wiring In all cases pin 2 on the XLR connector is the positive terminal The Speaker Level High Pass Output requires a standard Neutrik Speakon connector The other end of the Speaker Level High Pass Output cable must be stripped and terminated to allow for wiring to the approved On Point Audio top box loudspeaker Presets 1 thru 4 are factory programmed for the OPALine 28 OPA 5 OPA 8NP or OPA 28NP The Speaker Level High Pass Output is shown below The speaker cable is NOT supplied by On Point Audio On Point Audio recommends wire gauge between AWG 16 and AWG 12 depending on the length of the wire between the OPA 151SA enclosure and the top box enclosure A 4 pin Speakon is required for the a
8. REPLACE ONLY WITH THE SAME TYPE OF FUSE THIS FUSE TYPE IS NOTED ON THE INPUT PANEL NEAR THE FUSE HOLDER THE LOCATION OF THE FUSE HOLDER IS SHOWN BELOW NOTE This fuse type is 6 3AH250VP CAUTION F EN60065 WARNING NO USER SERVICEABLE PARTS INSIDE ONLY QUALIFIED SERVICE TECHNICIANS AUTHORIZED TO REMOVE AMPLIFIER PANEL CAUTION To REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE AVIS RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR Fuse 6 3AH250VP Made in China AC Mains Voltage 90V 240V Mains Frequency 50Hz 60Hz Power Consumption 1000VAmxa FUSE HOLDER located inside the IEC AC mains connector PRODUCT SERVICE There are NO user serviceable parts inside the OPA 151SA enclosure or amplifier The OPA 151SA amplifier module MUST be serviced by a company authorized by On Point Audio or One Systems Inc Replacement of Components REPLACEMENT OF COMPONENTS MUST BE PERFORMED BY A QUALIFIED TECHNICIAN OR ONE KNOWLEDGABLE IN THE REPLACEMENT OF TRANSDUCER COMPONENTS DO NOT ATTEMPT ANY REPAIRS UNLESS THE OPA 151SA AMPLIFIER HAS BEEN DISCONNECTED FROM THE AC MAINS SOURCE In the event of woofer failure the woofer may be accessed by removing the front grille and then removing the woofer This should be done by a qualified technician or contractor There is no need to remove the amplifier s panel in the event of a woofer failure Please note the wiring polarity and
9. d the end user This manual must be read and understood and all warnings must be followed Follow all instructions to ensure optimal product performance The OPA 151SA is a convection cooled device and it requires at least 7 inches 178 mm of clearance behind the enclosure to allow the heat sink to adequately cool the internal electronics DO NOT INSTALL NEAR ANY HEAT SOURCES Use only the supplied AC Mains connector Protect the AC Mains power cord from being walked on or otherwise damaged and inspect for damaged connections and damaged insulation There are NO user serviceable parts inside the enclosure DO NOT REMOVE THE AMPLIFIER MODULE See Service section for details or contact One Systems FCC STATEMENT The OPA 151SA has been tested and is compliant with the limits for Class B digital devices per Part 15 of the FCC rules Test data is available from On Point Audio INTRODUCTION Thank you for purchasing the On Point Audio OPA 151SA and for your faith in us and our products The OPA 151SA will provide you many years of useful service with proper use and care Please read this manual completely and become familiar with the design and operation of this advanced active subwoofer system CONTENTS The OPA 151SA system is shipped in one carton The contents of the carton are as follows OPA 151SA System 1 One OPA 151SA that includes a Class D digital power amplifier system with onboard Digital Signal Processing DSP 2
10. ed for selected On Point Audio products Presets 5 thru 7 are available for user defined presets via OPA Net pc software Pre Set 8 is low level pink noise Preset 8 is included in case the knob is removed from the PRE SET EQ selector The selector shaft can be easily rotated until the low level noise is heard Once the low level noise is heard the knob can be re attached with the know selector arrow set to position 8 Presets 1 thru 4 are set at the factory and cannot be modified As an example if the OPA 151SA is being used with the OPALine 82 Preset 4 should be opened Then any modifications to equalization or delay settings required for the venue acoustics or desired voicing may be made and the resultant program can be saved into Presets 5 thru 7 The preset list is found immediately below the OPA 151SA input section as shown below POWER LIMIT SIGNAL CLIP w Skee OPA Net PRE SET EQ LINE INPUT Preset 1 OPA 151SAwith OPA 5NP Preset 2 OPA 151SAwith OPA 8NP Preset 3 OPA 151SAwith OPA 28NP Preset 4 OPA 151SAwith OPA Line8 amp 2 Preset 5 OPA 151SAwith User Defined Out Preset 6 OPA 1f 1SAwith User Defined Out Preset 7 OPA 1 51SAwith User Defined Out Preset 8 OPA 151SAPink Noise 10dB No Output on Channel 2 The OPA 151SA Preset list USING THE OPA 151SA PRE AMP AND OPA NET COMPUTER CONTROLLED SOFTWARE The OPA 151SA features a high performance digital signal processor DSP The operating software allo
11. en setting this gain level Itis recommended that the gain be set to the OdB point and that all system gain be controlled via the mixing desk If excessive output levels are presented to the input of the OPA 151SA it is possible to overload clip the input and produce distortion If distortion is heard the OPA 151SA input gain may be reduced or the mixer level gain at the output of the mixing desk may be reduced to eliminate the system overload POWER LIMIT SIGNAL CLIP INPUT GAIN ele ee OPA Net PRE SET EQ LINE INPUT OPA 151SA system Input Gain The OPA 151SA offers processor dynamics limit indications as well as signal present and signal input clipping indication POWER LIMIT SIGNAL CLIP W INPUT GAIN Pat tee OPA Net PRE SET EQ LINE INPUT Processor Dynamics Limiting Signal Present and Input Signal Clipping Processor Dynamics Limiting will indicate the status of the factory programmed peak limiter and compressors When this LED is illuminated the input gain should be reduced The Signal Clip indication will illuminate when signal is present If the Signal Clip indicator is blinking the input signal to the OPA 151SA is too high indicating input clipping If the Signal Clip indicator is blinking then the audio signal supplied to the OPA 151SA must be reduced ie mixer output or other source output level The OPA 151SA also offers 7 Pre Set EQ programs Presets 1 thru 4 are factory defin
12. ge AEA EN60065 WARNING NO USER SERVICEABLE PARTS INSIDE ONLY QUALIFIED SERVICE TECHNICIANS AUTHORIZED TO REMOVE AMPLIFIER PANEL CAUTION To REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE AVIS RISQUE DE CHOC ELECTRIQUE NE PAS OUVR MANUFACTURING Made in China AC Mains Voltage 90V 240V Mains SEAE ARE ope Hz 1000VA On Off Switch The OPA 151SA will operate on AC mains voltages of 115 volts to 230 volts The required AC mains frequency is between 50 Hz and 60 Hz The OPA 151SA uses an industry standard IEC mains connector system To mate the AC mains cable with the AC mains connector on the amplifier simply align the plug with the panel s connector and press the AC mains cable into place Always support the OPA 151SA enclosure with one hand while performing this operation The AC mains connector is shown below Itis located on the lower portion of the OPA 151SA input panel CAUTION To REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THs EQUIPMENT TO RAIN OR MOISTUR AVIS RISQUE Oe CHOC ELECTRIQUE NE PAS OUVR MANUFACTURING Made in China AC Mains Voltage 90V 240V Mains agueran oo AC Mains panel connector To disconnect the cable end of the AC mains connector from the OPA 151SA simply pull the cable end away from the enclosure Make certain to support the OPA 151SA enclosure with one hand while performing this operation Pull from the molded end of
13. mplifier output side of the speaker cable The speaker side will be stripped bare wire or stripped bare wire with terminals suitable for the loudspeaker input barrier strip Speaker Level High Pass Output Beware High Voltage AGHA EN60065 WARNING NO USER SERVICEABLE PARTS INSIDE ONLY QUALIFIED SERVICE TECHNICIANS AUTHORIZED TO REMOVE AMPLIFIER PANEL CAUTION To REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE AVIS RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR MANUFACTURING SERIAL NUMBER DATE Speaker Level High Pass Output An audio input level of 0 774 V RMS will drive the OPA 151SA amplifier to full power Because each preset offers different equalization this 0 774 Vrms 0 dBu level is simply a mid band reference WARNING DO NOT PLACE ANY OTHER LOUDSPEAKERS EXCEPT FOR THE APPROVED ON POINT AUDIO MODELS ON THE OPA 151SA POLE ONLY THE OPALINE 82 MOUNTED WITH THE PSA 82 BRACKET IS APPROVED USE ONLY THE POLE s SUPPLIED AND REFER TO THE PSA 82 INSTALLATION MANUAL THIS MANUAL MUST BE READ AND UNDERSTOOD PRIOR TO MOUNTING THE OPALINE 82 AND PSA 82 ONTO THE OPA 151SA SUB WOOFER ENCLOSURE DO NOT SUBSTITUTE ANY OTHER MOUNTING POLES ALL ASSOCIATED RIGGING IS THE RESPONSIBILITY OF OTHERS A WARNING DO NOT POLE MOUNT ANY OTHER LOUDSPEAKERS ON TOP OF THE OPALINE 82 The OPA 151SA features user settable input level gain Caution should be exercised wh
14. onpointaudio ACOUSTIC EXCELLENCE On Point Audio OPA 151SA User Manual January 2015 The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operation and maintenance instructions High voltage The lightening flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated dangerous voltage within the products enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION TO REDUCE THE RISK OF ELECTRICAL SHOCK DO NOT REMOVE COVER NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL The On Point Audio OPA 151SA was designed to provide very high performance sound reinforcement very high output and low frequency response all in a small format design The OPA 151SA was designed for use in portable and fixed installation indoor environments such as night clubs churches meeting halls and general live performance applications The OPA 151SA features a 15 inch 381 mm diameter woofer Class D amplifier digital processing DSP and an enclosure design that provides very high acoustic output with extended low frequency response The system also features OPA Net programming software The system was designed to work in conjunction with the On Point Audio OPALine 82 OPA 8NP OPA 28NP and the OPA
15. ontour is set with peak frequencies at 50Hz and 12kHz When the DLF is activated there is amaximum low frequency boost of 9 3dB and a maximum high frequency boost of 5dB At 16dBu the gain of the low frequency boost and high frequency boost begins reducing As the input levels increase above 16dBu the gain progressively reduces The DLF function is 1 6dB low frequency boost at OdBu input level and the high frequency boost at OdBu is 0 6dB The DLF is basically out of circuit at 2dBu input level Care should be taken when using the DLF as the combination of DLF boost as well as additional DSP based EQ and outboard EQ ie mixer or graphic EQ can produce system clipping at high input levels ud 2 O 2 DLF Selection 3 High Pass Filter A selectable High Pass Filter may be inserted into the signal path if desired NOTE Presets 1 thru 4 already have high order 24dB Oct Butterworth filters in the signal path The addition of this High Pass Filter will likely not be necessary but is available if additional rapid attenuation is required HU 2 O 2 The high pass filter frequency is set by left clicking on the Frequency section in the High Pass Filter box The slope is selected in the drop down menu next to the Slope box 4 Gain The input gain of the OPA 151SA is set by left clicking on the slider in the Gain box It is recommended that this be set to 0 u 2 C 2 OPA 151SA input gain 5 EQ
16. s Activating this function sets all equalization settings to a unity gain OdB level The EQ bypass will set ALL EQ bands to a gain of OdB 9 Mute functions Input The entire OPA 151SA and top enclosure may be muted Low The subwoofer may be muted High The top enclosure may be muted E ud 2 O 2 N Bik i When a Mute is selected it will be highlighted in red colo 10 Temperature The Temperature section indicates the temperature of the OPA 151SA amplifier output section heat sink 11 Load Clicking on the Load button will open a window that allows a program to be imported from a saved location in the PC to the on board OPA 151SA memory 12 Save Clicking on the Save button will allow a program in the on board OPA 151SA memory to be saved to a location on the PC 13 Store This function allows modified programs to be stored in the DSP memory by selecting the program name and position NOTE Program Preset positions 1 thru 4 are locked and cannot be overwritten The only allowable positions to store new programs are 5 thru 7 14 Recall This function allows programs to be recalled to active status Programs Presets 1 thru 4 are factory defined and can only be recalled 15 Setup The Setup mode should NOT be used for the OPA 151SA or ANY OTHER On Point Audio products The selected mode should be 2 way mode ONLY Do not activate Bridge Mode configuration 16 Name Device
17. s00 fy 1000 i soo EE 100 250 1000 5000 epen aa nn aa sani nn O Facto 5e Each individual filter may also be bypassed by left clicking on the Bypass button immediately below the filter 6 Delay Units The Delay Units can be set in either time mSec or distance meters The maximum delay is 9 mSec 3 meters The delay increments can be adjusted in 0 01mSec steps using the Fine adjust function 7 Delay The Delay function can be used to provide signal delay for three basic sections of the OPA 151SA as noted below a Input This allows the delay of the overall OPA 151SA and top box system to be adjusted when multiple OPA 151SA systems are being used u C 2 Delay functions b Low The Low delay is used when the physical placement of the OPA 151SA is closer to the listening area then the top enclosures This allows the subwoofer signal to be aligned with the arrival time of the top enclosure c High The High delay is used when the physical placement of the top enclosure is closer to the listening area then the subwoofer This allows the top enclosure to be aligned with the arrival time of the subwoofer NOTE When the sub enclosure or top enclosure is substantially closer to the listening area then itis likely that sound pressure level differences between the sub and top enclosure will be experienced Broad band EQ essentially gain may be used as well as delay to optimize the acoustic response 8 EQ Bypas
18. the AC mains cable s plug not the cable itself NOTE ALWAYS turn off the AC mains power BEFORE disconnecting the AC mains cable from the OPA 151SA amplifier module DO NOT CONNECT THE AC MAINS END OF THE AC MAINS CABLE IN AN AREA THAT IS WET OR SUBJECT TO CONDENSATION OR DAMP CONDITIONS Once the AC mains cable is securely connected to both the amplifier and AC mains supply the OPA 151SA enclosure may be turned on It is good practice is to make certain that the audio levels on the mixer s output or other source output are reduced or muted prior to applying power to the OPA 151SA NOTE When power is applied to the OPA 151SA and the unit is turned on there is approximately a 5 to 15 second delay before the pilot light illuminates POWER LIMIT SIGNAL CLIP 30 0dB INPUT GAIN eee OPA Net PRE SET EQ LINE INPUT Pilot Light NOTE lf the pilot light does not illuminate within 30 seconds the unit may be ina FAULT CONDITION If this occurs the unit should be returned to On Point Audio for evaluation THERE ARE NO USER SERVICABLE PARTS INSIDE DO NOT REMOVE THE AMPLIFIER MODULE AUDIO CONNECTIONS The OPA 151SA includes both a male and female XLR type connectors Any standard XLR type cable end connectors may be used The image below illustrates the top portion of the OPA 151SA input plate Both the audio input and audio high pass output connectors are shown POWER LIMIT SIGNAL CLIP L 30
19. ws a user to program selected features of the DSP These features include gain equalization and delay The delay functions are available on both the sub channel and the high pass output channel This allows delay to be set based on the physical location of the OPA 151SA subwoofer enclosure relative to the top enclosure OPALine 82 OPA 5 OPA 28NP and OPA 8NP Programs Presets 1 thru 4 are factory defined and cannot be overwritten The recommended process to define new settings is to recall one of the 4 factory presets based on the specific top box being used and make the required modifications to EQ Delay and Gain and then store into the onboard DSP in Program Preset 5 thru 7 These Programs Presets can also be saved to a PC Control of the OPA 151SA is via a supplied RS485 to USB connector The PC system requirements are as follows Windows XP or newer operating software 512 MB Ram min 20 MB hard drive min NET Framework 4 0 USB Monitor 1024x768 The OPA 151SA is supplied with the required CD ROM To load OPA Net onto a PC follow the steps shown in the popup windows when the exe file is running The PC must be connected to the OPA Net input on the OPA 151SA as shown below The required cable USB to RS485 is supplied First connect the USB to RS485 cable to the OPA 151SA and then to PC where OPA Net is loaded Do NOT start OPA Net yet Switch the OPA 151SA power on then start OPA Net on the PC POWER LIMIT
20. zation is required care should be taken to avoid excessive EQ in any frequency band but particularly at low frequencies Excessive equalization can produce band selective clipping and distortion All EQ boost levels should be monitored if system distortion is present DISTORTED SOUND When input levels to the OPA 151SA exceed 0 774 Vrms OdBu the internal dynamics processing functions automatically engage to provide system protection However it is Still possible to overdrive the input section of the subwoofer system If distorted sound is present the following steps should be taken 1 Verify that the mixer s output is not clipping or overloaded If the output metering of the mixing console is continuously in the red then the output level should be reduced occasional red indications are usually fine but are dependent on the mixing console s output capability 2 Verify that excessive equalization is not present anywhere in the signal chain 3 Verify that AC mains levels are within the required range Voltage measurements on the AC Mains should be performed by a licensed electrician or individual trained in making high voltage measurements NO SOUND 1 Verify that signal is present on the input of the OPA 151SA 2 Verify that there is AC Mains voltage on the AC Mains input to the OPA 151SA 3 If AC Mains voltage is present verify that the OPA 151SA s fuse is not blown NOTE IF THE FUSE IS BLOWN
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