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572

572 SPL Computer

User

’s

Guide

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Содержание 572 SPL

Страница 1: ...572 572 SPL Computer User s Guide...

Страница 2: ...y means electronic or mechanical including photocopying scanning recording or by any information storage and retrieval system without permission in writing from Symetrix Inc 572 6408 216th St SW Mount...

Страница 3: ...on and identifies errors You show the 572 the parameters of the acoustic environment during calibration and then set the way you want the unit to respond to changes The 572 then takes the information...

Страница 4: ...kes one to two seconds Any signal applied to the paging inputs during this time immediately terminates the sense period If a silent period never occurs the 572 forces one A front panel control determi...

Страница 5: ...power cord is essential for safe operation Grounding The chassis of this product is grounded through the grounding conductor of the power cord To avoid electric shock plug the power cord into a proper...

Страница 6: ...by the 571 during the calibration procedure is used by the microprocessor to calculate gain changes As a result the unit doesn t care what the actual ambient noise level is during calibration However...

Страница 7: ...2 Line level paging source or other source to the PAGE terminals on TB1 Remember that mic or line paging sources duck the signal connected to the MUSIC input 3 Background or foreground music source to...

Страница 8: ...rs unity gain when the output is operated unbalanced and the gain is 6 dB when the output is operated balanced Calibration Procedure 1 Apply program or paging signals to the 572 s input s 2 Press the...

Страница 9: ...OUTPUT Sets the ambient gain ratio from 2 1 to 1 2 This determines whether the 572 makes a smaller change than the ambient 2 1 or a larger change than the ambient 1 2 GAIN LEDdisplay LED bargraph tha...

Страница 10: ...wering is not present If using a phantom powered microphone ensure that the phantom voltage does not exceed 15V Higher voltages may be used if the powering device contains blocking capacitors or isola...

Страница 11: ...long as this terminal is grounded The terminal must remain grounded for at least one second in order to perform sensing SPARE TB2 1 Not used not connected GROUNDS TB1 10 6 3 Connect to circuit ground...

Страница 12: ...hat the input signal causes a sample period the timer resets If the input material has sufficient silent periods the timer generated sample periods never occur In CAL mode the 572 acquires a history o...

Страница 13: ...572 the RATIO control determines how much the output changes for a given change at the sense input In the 12 00 position the ratio is 1 1 a 1 dB sense change results in a 1 dB output change Turning th...

Страница 14: ...does not predispose them to only this usage After all 1 4 inch jacks are sometimes used for loudspeakers which are anything but high impedance Therefore the presence of 3 pin XLR connectors should not...

Страница 15: ...o the aforementioned impedances XLR Polarity Convention The 572 uses the international standard polarity convention of pin 2 hot The following chart shows the connections for each type of connector In...

Страница 16: ...r source exter nally Note The microphone input is direct coupled there are no dc blocking capacitors If you use a phantom powered microphone the phantom supply voltage must be 15 volts or less 15 volt...

Страница 17: ...en collector of a 2N4401 NPN transistor You must supply power for any external relay used The transistor s limits are VCEO 40V and Icmax 625 mA In when the BYPASS switch is pressed the line level MUSI...

Страница 18: ...as many operational options mostly controlled by a 4 wide DIP switch located on the front panel The microprocessor scans the switches continuously any changes in their settings are acted upon almost i...

Страница 19: ...g The system audio level will return to normal in 10 seconds It may be helpful to monitor the acoustical level in the space with a sound level meter 10 Calibration is complete The 572 will adjust the...

Страница 20: ...DOWN Disabled OptionSwitchC SAMPLEAVERAGING UP Running Average DOWN No Average OptionSwitchD EXTERNALSENSE UP Enabled DOWN Disabled What Could Go Wrong Here are the two most common situations and som...

Страница 21: ...f this isn t desirable then exclude that particular speaker from the speakers used for sensing by connect the offending speaker s directly to the amplifier output bypassing the 572 In other cases dire...

Страница 22: ...the line transformers With highly efficient speakers this may present a problem because the sense input of the 572 may be overloaded Use OPTION switch B to check the level coming back Refer also to t...

Страница 23: ...the RATIO control determines how much the output changes for a given change at the sense input In the 12 00 position the ratio is 1 1 a 1 dB sense change results in a 1 dB output change Turning the R...

Страница 24: ...imum output level of the 572 regardless of the setting of the RATIO control or the ambient noise level The rule here is the change in ambient level times the slope may not exceed MAXL If the computed...

Страница 25: ...espresso machines for sensing In bars and lounges keep any speakers mounted near the blenders and dishwashers behind the bar out of the sensing circuit Remember that any extraneous sound sources like...

Страница 26: ...nd the line level paging input for facility wide paging Use the music input for background music if any RaceTracks Different race tracks have different noise sources In auto racing the cars usually ma...

Страница 27: ...he PAGE MIC INPUT Unitdoesnotaccuratelyadjustsystemasambientnoisechanges Bad calibration Repeat procedure during quiet time Hum induced in speaker wiring Ensure that speaker wiring is not routed adjac...

Страница 28: ...40 dB overall max range and shall be governed by a microprocessor which shall be controlled by embedded software The device shall vary its gain based upon measurements of the sound pressure level of...

Страница 29: ...on and buyer s remedies hereunder are SOLELY and exclusively as stated herein This Symetrix product is designed and manufactured for use in professional and studio audio systems and is not intended fo...

Страница 30: ...collect shipments Just do these five things and repairs made in warranty will cost you only one way freight charges We ll prepay the return surface freight If you choose to send us your product in so...

Страница 31: ...lling the 572 when to sense electronic wizardry slavelabor etc OPTION switch D has one additional use forcing multiple 572s to sample simultaneously There are two reasons for doing this 1 Adjacent sou...

Страница 32: ...M TO SPEAKER MUSIC LINE INPUTS Vc LINE PAGE SENSE TRIG EXT RELAY CNTRL EXT SPARE OUTPUT AMP FROM TO SPEAKER MUSIC LINE INPUTS Vc LINE PAGE SENSE TRIG EXT RELAY CNTRL EXT SPARE OUTPUT AMP FROM TO SPEAK...

Страница 33: ...D OUT FEMALE XLR PIN 1 GROUND PIN 2 HIGH PIN 3 LOW MALE XLR PIN 1 GROUND PIN 2 HIGH PIN 3 LOW MALE TS PLUG TIP HIGH SLEEVE GROUND LOW MALE TRS PLUG TIP HIGH RING LOW SLEEVE GROUND MALE TRS PLUG TIP HI...

Страница 34: ...572 32 Symetrix Inc 6408 216th St SW Mountlake Terrace WA 98043 USA Tel 425 778 7728 Fax 425 778 7727 Website http www symetrixaudio com Email symetrix symetrixaudio com...

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