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Содержание 5547A

Страница 1: ...TRONIC PRODUCTS model 5547A model 5549A 1 3 OCTAVE EQUALIZERS JBL Incorporated 8500 BALBOA BOULEVARD P 0 BOX 2200 NORTHRIDGE CA 91329 U S A PHONE 818 893 8411 TELEX 4720424 SERVICE ADDRESS UREI Incorp...

Страница 2: ...unit during shipment Nevertheless we recommend careful examination of the shipping carton and its contents for any sign of physical damage which may have occurred in transit If damage is evident do no...

Страница 3: ...will operate satlfactorily over a range of ambient temperatures from 0 C to 50 C 32 F to 122 F and up to 80 non condensing relative humidity If the unit is installed in an equipment rack console or ot...

Страница 4: ...to allow precise tailoring of system gain and headroom In order to best utilize this capability it is important for you to understand the action of these controls The INPUT control changes the gain of...

Страница 5: ...pade or ring lugs or a 6 position fanning strip When using stranded wire take care that no individual strands work loose to short to adjacent connectors or to the chassis Because of the high pressure...

Страница 6: ...fferential amplifiers Balanced wiring is the preferred style especially when running long lines due to the ability of a balanced input to reject signals such as hum fields which are induced equally in...

Страница 7: ...lity of noise pickup in those lines We recommend that two conductor shielded cable be used even in an installation using unbalanced wiring Do not depend on the shield wire itself to complete the signa...

Страница 8: ...entists and engineers at Bell Telephone Laboratories The technology that they and others developed has had a lasting influence on the design and specification of all types of audio products Among thei...

Страница 9: ...270 ohm resistor in each leg of a balanced system However most modern audio systems do not require the use of 600 ohm transmission line practices This is for two reasons First most audio systems are...

Страница 10: ...ould be to remove the strap on the rear panel barrier strip which connects audio ground and chassis Removal of this strap may have a significant effect on reducing the hum Audio ground will then be re...

Страница 11: ...ake a trade off of any excess headroom for improved signal to noise ratio Unfortunately this is not always easy to do An equalizer in a sound system should be operated at as high a signal level as pos...

Страница 12: ...in FIGURE 2A the noise and headroom numbers are unchanged from the example in FIGURE 1A In the case of the 10 dBu signal however the gain of the input amplifier may be raised by 14 dB and the gain of...

Страница 13: ...tead of one and in some instances it may be necessary to do so Traditionally the adjustment of controls affecting headroom has either been a hit or miss proposition or one that required test equipment...

Страница 14: ...nvironment this means that the equalizer may serve double duty The end cut filters of these equalizers are 12 dB octave and are tunable through a wide range In addition the High Cut filter low pass ma...

Страница 15: ...asily heard without distracting level changes The third bypass circuit is just for the End Cut Filters The End Cut Filters may be completely removed from the signal path so that they have absolutely n...

Страница 16: ...ways flush mounted with the panel and rack ears in the same plane or recess mounted with the rack ears extending forward so that the controls do not extend beyond the front panel of the rack ears With...

Страница 17: ...one third graphic equalizer for desired results the first time you work with it The remainder of this section first covers areas of common concern in the use of all equalizers followed by specific cre...

Страница 18: ...ies may be at a high level at the output due to the equalizer s action The limiter which is actuated by the level of the signal should see the equalized or balanced signal The use of the equalizer pri...

Страница 19: ...and the signal to noise and distortion characteristics of the individual components of the system and the system as a whole 2 Check polarity of signal lines from all inputs through to all outputs 3 C...

Страница 20: ...quent changes of high frequency response are required as in control and monitor rooms to adjust to different program material or producers taste The filter skirts intersect at the continuously variabl...

Страница 21: ...he freedom to do it wrong without offending someone else Doing it the wrong way means to know what does not work Start out with simple program material of various types and try to make it sound better...

Страница 22: ...n controls are in the flat position or attenuated no special care is necessary with regard to input signal level other than keeping it below 20 dB Ref 0 77B V rms However if any of the controls are ad...

Страница 23: ...storted For example a clarinet has a specific characteristic with regard to the levels of various harmonics compared to the fundamental tone If these signals are processed through an audio system with...

Страница 24: ...considerably greater level which cover up the sounds in the intelligibility band the words may simply not be understood Equalization is very helpful to correct some of these problems SOME PROBLEMS WIT...

Страница 25: ...Widely disparate settings of adjacent controls should be avoided if at all possible A control panel in which adjacent adjustment knobs are 8 to 10 dB apart may look interesting but the resultant soun...

Страница 26: ...tion The natural tendency is to fill in the holes of the frequency response with Boost equalization Unfortunately if the cause of the dip is not amenable to correction then no amount of Boost EQ will...

Страница 27: ...e generated and plotted on a chart or strip recorder 4 Time delay spectrometry TD5 is a more recent development with the capability of analyzing not only frequency versus amplitude but also with respe...

Страница 28: ...gh frequencies and between speakers covering different parts of the listening area ADJUSTMENT OF CORRECTIVE EQUALIZERS Room equalization is performed as a series of approximations of control settings...

Страница 29: ...the gain until the feedback frequency becomes detectable and stabilize the feedback to a constant comfortable level Caution feedback is not only annoying to the ear but it is also dangerous to unprote...

Страница 30: ...erial and workmanship for a period of one year from the date of purchase We suggest that you retain a copy of your dated sales receipt for proof of warranty status should that be necessary If you wish...

Страница 31: ...period and repair attempts by unqualified personnel may invalidate the warranty THE MODELS 554 _AND_5549 This manual was written to cover the JBL UREI Models 5547A and 5549A They were preceeded by th...

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Страница 33: ...M 70pF 0033 j 00lt t r f 1 r 1 it sfc i Hi s J_C5 _1_C5 _i_ C 1 25K 1 6K 2K TX C N N CI07 CIOS T J 2 5K 3 15K SK 1C 2 6 3K I N N 009 CHO tfj SR96 S 36K i R07 33K 1 1 R89 2OK R90 43K q R88 20K J q D 1...

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