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JBL Control 19CS Application Manual

Other manuals for Control 19CS: Owner's Manual, Owner's Manual

Summary of Control 19CS

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    Control contractor ceiling loudspeakers 7hfkqlfdo$ssolfdwlrq*xlgh rev a mar-99 rick kamlet.

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    7deohri&rqwhqwv reference charts from owner’s manual ........................................................................... Iv optional brackets, cutout sizes, connector hookup, instructions & descriptions -%/'lvwulexwhg6\vwhp'hvljq'6'6riwzduh &ryhudjh understanding coverage ......................

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    Iv 5hihuhqfh&kduwviurp2zqhu·v0dqxdo the following charts and diagrams from the owner’s manual are included here for reference: 7deoh 2swlrqdo1hz&rqvwuxfwlrq%udfnhwv m o d e l n e w c o n s t r u c t io n b r a c k e t p la s t e r - r i n g b r a c k e t control 24c & 24ct mtc-24nc mtc-24mr control ...

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    1 this technical application guide is intended as an adjunct to the owner’s manual that comes with the jbl control contractor ceiling speaker. The intent is to assist sound system designers – from the new designer to the experienced systems contractor – to design superior distributed system installa...

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    2 the sound system designer needs to work with the coverage over a flat listening plane – this is called the listening-plane coverage specification. The listening-plane spec represents the reality of the speaker’s coverage for the listeners. Laws of physics dictate that the listening-plane coverage ...

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    3 polar-to-listening-plane conversion – to compute the listening-plane coverage more precisely, you need to use the exact polar plot of the speaker (real polar plots directly from test equipment are better than an artist’s redrawing). Polar plots are usually normalized to the on-axis value, which is...

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    4 control contractor ceiling speaker coverage: following are both the polar and isobar coverage angles for the control contractor ceiling speakers: 7deoh &21752/&2175$&725 &29(5$*($1*/(6 model nominal coverage (polar) nominal coverage (listening plane) control 24c & 24ct 130 ° conical 100 ° conical ...

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    5 3rodu&ryhudjh ri&rqwuro& $fwxdo&ryhudjhe\)uhtxhqf\ single speaker coverage – the coverage area of a single speaker depends on the distance of the speaker from the listener, which depends upon the ceiling height and the listening height (seated vs. Standing). The following chart assumes a 4 ft (1.2...

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    6 downward adjustment of at least 4 db must be made to the maximum pink noise computation to reflect the maximum average spl capability for music or speech. To compute the “maximum spl (sound pressure level) of music or speech” of a single loudspeaker use the following formula: max average spl (for ...

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    7 spl of 70v/100v vs. Low impedance speakers – 70v/100v speakers produce lower maximum output due to a number of factors. First, they are tapped at lower power levels than the low-impedance speaker’s capabilities. Second, there is always some “insertion loss” through the speaker transformer. In addi...

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    8 square pattern – the square pattern often requires fewer speakers, resulting in a lower system cost. A square pattern sometimes may be easier to lay out on a suspended ceiling tile grid. It may also be easier to zone large open spaces using the square pattern. The square pattern is usually a good ...

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    9 considerations for selecting layout density -- higher speaker density (tighter spacing) provides higher spl capability, overcomes ambient noise better and reduces the differences in sound level from location to location within the space. Lower densities result in fewer speakers and lower system co...

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    10 it is important to consider level variation in distributed systems design, and not assume that every location within a listening space will be at the same level – or can achieve the same maximum spl – as does a location directly under a speaker. 7deoh /hyho9duldwlrq'xhwr/d\rxw3dwwhuq'hqvlw\ layou...

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    11 7deoh5rxjk*xlgholqhiru/d\rxw'hqvlw\ edge-to-edge minimum overlap full overlap low level background music ✔ ✔ ✔ background music with basic paging maybe ✔ ✔ foreground music with high quality paging ✗ maybe ✔ heavy speech reinforcement ✗ maybe ✔ in summary, the choice of speaker model, layout patt...

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    12 6xezrrihuv subwoofers can be a very important part of making a business music system outstanding. The control 19cs and 19cst in-ceiling subwoofers provide good bass from an extremely compact enclosure that can be installed into a ceiling. The number of subwoofers to use, where to position them, h...

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    13 a) overlap mode -- operating control 24c/control 26c full-range the control 19cs subwoofer and the control 24c or control 26c full-range speakers can all be driven from a full-range signal. The bass capabilities of the full-range speakers add to that of the subwoofer. Medium bass -- for music req...

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    14 7hfkqlfdo&rqvlghudwlrqv designing for speech intelligibility • choose the appropriate speaker for the application output capability – make sure the speaker you choose has adequate power handling and sensitivity to produce the sound levels required. For good paging, the speaker is typically requir...

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    15 finding the ambient sound level – if the installation is in an existing location that is already in use, use an spl meter set for slow response to measure the a-weighted ambient sound at the listener’s ear position. Try to take measurements during the noisiest time and make sure the hvac (air han...

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    16 low-impedance vs. 70v/100v speakers control contractor ceiling speakers come in low-impedance (“non-t”) and 70v/100v (“t”) versions. There are different types of power amplifiers for driving each of these types of speakers. Make sure to use the correct amplifier type specifically designed to driv...

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    17 70v/100v power amplifier considerations a) sizing – add up the total wattage of all the taps you are connecting to the 70v/100v line. It is an accepted rule-of-thumb to add 20% to this figure to make sure that the amplifier does not get over-taxed. For example, if you are connecting six (6) speak...

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    18 connection of 70v/100v speaker system parallel hookup of 70v/100v impedance speakers (control 24ct or 26ct) (mono shown — duplicate for stereo) parallel hookup of 70v/100v full-range speakers with c19cst 70v/100v subwoofer (mono shown — duplicate for stereo) bi-amplified hookup of 70v/100v full-r...

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    19 connection of hybrid bi-amplified speaker system 70v/100v full-range (or high-passed) speakers and low impedance control 19cs subwoofers (mono shown — duplicate for stereo, or use crossover that provides mono subwoofer feed) note: jbl mpc-t amplifiers have the ability to simultaneously drive a 70...

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    20 $gglwlrqdo$ssolfdwlrq6xssruw additional application information is available from the following reference sources: sound system engineering, davis and davis howard w. Sams & co. (1987) electroacoustical reference data, eargle van nostrand reinhold (1994) handbook for sound engineers, the new audi...