JBL Control 24C Application Manual
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JBL Control 24C Application Manual

Control contractor ceiling loudspeakers
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See also: Owner's Manual
Control Contractor
Ceiling Loudspeakers
7HFKQLFDO $SSOLFDWLRQ *XLGH
Rev A
Mar-99
Rick Kamlet

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Summary of Contents for JBL Control 24C

  • Page 1 Control Contractor Ceiling Loudspeakers 7HFKQLFDO $SSOLFDWLRQ *XLGH Rev A Mar-99 Rick Kamlet...

  • Page 2: Table Of Contents

    7DEOH RI &RQWHQWV Reference Charts from Owner’s Manual ................iv Optional Brackets, Cutout Sizes, Connector Hookup, Instructions & Descriptions -%/ 'LVWULEXWHG 6\VWHP 'HVLJQ '6' 6RIWZDUH   &RYHUDJH   Understanding Coverage ......................1 Polar vs. Listening-Plane Coverage Specs, Polar to Listening-Plane Conversion, Conversion Chart Control Contractor Coverage......................
  • Page 3 Ne w Co ns truc t io n M o de l Br ac k et P las t er - R i n g Br ac k et Control 24C & 24CT MTC-24NC MTC-24MR Control 26C & 26CT MTC-26NC MTC-26MR Control 19CS &...

  • Page 4: Ryhudjh

    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 installations utilizing JBL Control Contractor Ceiling Speakers.
  • Page 5 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 is always more narrow than the polar coverage pattern.
  • Page 6 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 usually labeled “0 dB”. For every angle off- axis, there is a difference-figure between this normalized 0 value and the actual level.

  • Page 7: Control Contractor Coverage

    Control Contractor Ceiling Speakers: 7DEOH  &21752/ &2175$&725 &29(5$*( $1*/(6 Model Nominal Coverage Nominal Coverage (POLAR) (LISTENING PLANE) Control 24C & 24CT 130° conical 100° conical Control 26C & 26CT 110° conical 95° conical Control 19CS & 19CST Omnidirectional (180°) below 120° conical 160Hz.

  • Page 8: 6Rxqg 3Uhvvxuh /Hyho 63

    The following chart assumes a 4 ft (1.2 m) listening plane and averages coverage over the 500 Hz to 8 kHz range: 7DEOH  6,1*/( 63($.(5 &29(5$*( Diameter of Circular Coverage Pattern, Listening Plane Control 24C/24CT Control 26C/26CT 10 Ft (3.1 m) Ceiling Height: -6 dB coverage 14 ft ( 4.3 m) 13 ft ( 4.0 m)

  • Page 9: Max Spl Table

    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 MUSIC AND SPEECH) = 10 (log (PINK NOISE POWER HANDLING)) + SENSITIVITY –...

  • Page 10: Spl Of 70V/100V Vs. Low Impedance Speakers

    (short-term) headroom. Amplifiers with higher clipping limits and greater dynamic headroom can result in substantially higher output from 70V/100V loudspeakers. Note: All of the computations in Table 6 assume JBL MPC amplifiers which exhibit high clipping limits AND good dynamic headroom.

  • Page 11: Layout Density Factors - Edge-To-Edge, Minimum Overlap And Maximum Overlap

    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 starting point for a design.
  • Page 12 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 cost, but provide lower SPL capability and greater variations in level within the space.
  • Page 13 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  /HYHO 9DULDWLRQ 'XH WR /D\RXW 3DWWHUQ 'HQVLW\...
  • Page 14 Device files for the Control Contractor ceiling loudspeakers are available in the U.S. directly from JBL Professional. In areas outside the U.S. device files can be obtained from JBL’s authorized Distributor in your region. Device files can also be downloaded from the JBL...

  • Page 15: 6Xezrrihuv

    How Many C19CS Subwoofers to Use – Light background or foreground music usually does not require subwoofers. The Control 24C and Control 26C produce adequate bass levels to be able to turn the bass up (via tone control or EQ) and get good full-range sound for low-level music reproduction.
  • Page 16 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.

  • Page 17: 7Hfkqlfdo &Rqvlghudwlrqv

    Setting SPL Target Goals While the JBL Distributed System Design (DSD) software or acoustic design programs (like CADP2 or EASE) can predict HOW the system will perform in the room, the system designer must determine what the GOAL is for each application.

  • Page 18: Equalizing Ceiling Speakers

    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 handling) system is operating during the test.

  • Page 19: Low Impedance Vs. 70V/100V Speakers

    Many low-impedance amplifiers accept loads of 4 ohms or 2 ohms. It is possible to connect as many as four (4) Control 24C or Control 26C speakers in parallel to each channel of a 4-ohm-capable amplifier, and as many as eight (8) speakers in parallel to each channel of a 2-ohm-capable amp.

  • Page 20: Connection (Hookup Diagrams)

    Connection of Low-Impedance Speaker Systems Parallel Hookup of Low Impedance Speakers (Control 24C or 26C) (mono shown — duplicate for stereo) Add’l Spkrs –...
  • Page 21 Connection of 70V/100V Speaker System Parallel Hookup of 70V/100V Impedance Speakers (Control 24CT or 26CT) (mono shown — duplicate for stereo) Add’l Spkrs – – – 70V/100V Output – One Amplifier Channel Parallel Hookup of 70V/100V Full-Range Speakers with C19CST 70V/100V Subwoofer (mono shown —...

  • Page 22: Stereo Distributed Speakers

    Subwoofer – One Amplifier Channel Note: JBL MPC-T amplifiers have the ability to simultaneously drive a 70V/100V line from one channel and low impedance speakers on the other channel, such as shown in diagram. Stereo Distributed Systems Stereo systems are becoming popular in higher-end business music applications. Stereo can add a sense of spaciousness to the listening environment, but is slightly more expensive to implement.
  • Page 23 8500 Balboa Blvd, Northridge CA 91329 USA. In the USA call Monday through Friday 8:00 am to 5:00 pm Pacific Coast Time (818) 894-8850. IN OTHER AREAS THROUGHOUT THE WORLD: Contact the JBL Distributor for your region. JBL PRO WEBSITE: www.jblpro.com JBL Professional 8500 Balboa Blvd, P.O.

This manual is also suitable for:

Control 24ctControl 26cControl 26ctControl 19csControl 19cst

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