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Crown VCA-MC4A Operation Manual

Vca-mc series
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VCA-MC Series Operation Manual
VCA-MC4A
VCA-MC8
1-VCAP
Obtaining Other Language Versions: To obtain information in another language about the
use of this product, please contact your local Crown Distributor. If you need assistance locating
your local distributor, please contact Crown at 574-294-8000.
This manual does not include all of the details of design, production, or variations of the equip-
ment. Nor does it cover every possible situation which may arise during installation, operation or
maintenance.
The information provided in this manual was deemed accurate as of the publication date. However,
updates to this information may have occurred. To obtain the latest version of this manual, please
visit the Crown website at www.crownaudio.com.
Trademark Notice: Crown, Crown Audio and Amcron are registered trademarks of Crown
International. Other trademarks are the property of their respective owners.
Some models may be exported under the name Amcron.
©2008 Crown Audio
Telephone: 574-294-8000
®
Inc., 1718 W. Mishawaka Rd., Elkhart, IN 46517-9439 U.S.A.
4-VCAP
®
135504-5
5/08

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Summary of Contents for Crown VCA-MC4A

  • Page 1 1-VCAP Obtaining Other Language Versions: To obtain information in another language about the use of this product, please contact your local Crown Distributor. If you need assistance locating your local distributor, please contact Crown at 574-294-8000. This manual does not include all of the details of design, production, or variations of the equip- ment.

  • Page 2: Important Safety Instructions

    Nor does it cover every possible situation which may arise during installation, operation or maintenance. If you need special assistance beyond the scope of this manual, please contact Crown Technical Support. 1718 W. Mishawaka Rd., Elkhart, Indiana 46517 U.S.A.

  • Page 3: Table Of Contents

    7.2.3 Factory Service Shipping Instructions ... 16 7.2.4 Packing Instructions ... 16 7.2.5 Estimate Approval... 17 7.2.6 Payment of Non-Warranty Repairs... 17 8 Warranty ... 18 Crown Factory Service Information Form ... 21 Operation Manual Table of Contents page 3...
  • Page 4 Figure 3.2 Wiring Your Own Potentiometer ... 8 Figure 3.3 Example Showing VCA1 and VCA2 Tied Together ... 9 Figure 5.1 System Block Diagram ... 13 Tables Table 1. Attenuation per Detent of Crown VCAP Level Control... 11 Operation Manual page 4...

  • Page 5: Welcome

    The VCA-MC (VCA multichannel module) is an optional accessory module for the CTs 4200 or CTs 8200 power amplifier. The module provides independent remote level control for each channel. VCA-MC4A (Figure 1.1) is the VCA module for the CTs 4200. VCA- MC8 (Figure 1.2) is the VCA module for the CTs 8200.

  • Page 6: Vca Module Features

    VCA-MC Series Amplifier Accessories 1.1 VCA Module Features • Provides independent remote level control for each channel of a Crown CTs 4200 or CTs 8200 power amplifier. • Four-pin removable Phoenix-style barrier connectors provide the +10 VDC control voltage, ground, and control inputs for two amplifier channels.

  • Page 7: Setup

    1. Install a single-gang junction box for the 1-VCAP or a double-gang junction box for the 4-VCAP. Run a cable between the junction box and the power amplifier, allowing some slack on both ends. No cable is provided. CAT-5 cable will work fine, but Crown recom- mends using standard twisted-pair shielded microphone cable.

  • Page 8: Wiring Your Own Potentiometer

    5. Align a supplied barrier plug with the corresponding pins in the VCA-MC4A or VCA-MC8 module. Attach the cable to the plug as follows: Connect twisted-pair HOT lead to the VCA channel terminal(s) you want to control. Connect twisted-pair COLD lead to the +10V terminal.

  • Page 9: Bridge-Mono Wiring

    VCA-MC Series Amplifier Accessories NOTE: When connecting your DC supply to the control pin and ground pin, be sure to avoid ground loops. The control input filters out most AC voltages but a ground loop can modulate the gain element of the VCA if the interference is of great enough amplitude. 3.4 Wiring for Multi-Channel Control Often it is beneficial to control multiple amplifier channels with one control.

  • Page 10: Operation

    VCA-MC Series Amplifier Accessories 4 Operation 4.1 Operation Using the VCAP Wall-Mount Level Control 1. Turn the amplifier's back panel attenuator fully counterclockwise (off). 2. Unplug the connections to the VCA-MC module if they have been previously installed. Remember that each connector has two channels on it. Don't unplug the VCA control for a channel that is in use, because full volume will be sent to that zone since the VCA attenuation is 0dB when nothing is connected! 3.

  • Page 11: Troubleshooting

    VCA-MC Series Amplifier Accessories TABLE 1. ATTENUATION PER DETENT OF CROWN VCAP LEVEL CONTROL Set the VCAP panel knob to the desired attenuation according to the table below. DETENT ATTENUATION Detent 0 is full counterclockwise. Dentent 30 is full clockwise. Note: This table is for refer- ence only.

  • Page 12: Operation Usingyour Own Potentiometer Or An

    VCA-MC Series Amplifier Accessories 4.2 Operation Using Your Own Potentiometer or an External 10VDC Variable Source 1. Turn the amplifier's back panel attenuator fully counterclockwise (off). 2. Unplug the connections to the VCA-MC module if they have been previously installed. Remember that each connector has two channels on it.

  • Page 13: Theory Of Operation

    VCA-MC Series Amplifier Accessories 5 Theory of Operation The amplifier attenuator and the VCA attenuator are in series (Figure 5.1). The gain of the series combination is the sum of both attenuator settings. For example, if the amplifier attenuator is set at –10 dB and the VCA attenuator is set at –33.3 dB, the total attenuation is –43.3 dB.

  • Page 14: Specifications

    6 Specifications VCA-MC4A Pins: VCA, GND, +10V, VCA (x2) Weight: 3.6 oz (102 g) Dimensions: Gain Module: 5-1/2" x 2-1/2" (14.0 cm x 6.4 cm) Connector Break-Out: 5-15/16" x 1-1/2" (15 cm x 3.8 cm) Control Voltage: 0 to +10VDC between GND and VCA...

  • Page 15: Service

    Crown Customer Service to obtain prepaid shipping labels prior to sending the unit. Or, if you prefer, you may prepay the cost of shipping, and Crown will reimburse you. Send copies of the shipping receipts to Crown to receive reimbursement.

  • Page 16: Factory Service Shipping Instructions

    Inc. assumes no responsibility for damaged goods and/or accessories that are sent with your unit. 1. Fill out and include the Crown Audio Factory Service Information sheet in the back of this manual. 2. Do not ship any accessories (manuals, cords, hardware, etc.) with your unit. These items are not needed to service your product.

  • Page 17: Estimate Approval

    7.2.5 Estimate Approval Approval of estimate must be given within 30 days after being notified by Crown Audio Inc. Units still in the possession of Crown after 30 days of the estimate will become the property of Crown Audio Inc.

  • Page 18: Warranty

    Crown International, 1718 West Mishawaka Road, Elkhart, Indiana 46517-4095 U.S.A. warrants to you, the ORIGINAL PURCHASER and ANY SUBSEQUENT OWNER of each NEW Crown product, for a period of three (3) years from the date of purchase by the original purchaser (the “warranty period”) that the new Crown product is free of defects in materials and workmanship.
  • Page 19 ITEMS EXCLUDED FROM THIS CROWN WARRANTY This Crown Warranty is in effect only for failure of a new Crown product which occurred within the Warranty Period. It does not cover any product which has been damaged because of any intentional misuse, accident, negligence, or loss which is covered under any of your insurance contracts.
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  • Page 21: Crown Factory Service Information Form

    VCA-MC Series Amplifier Accessories Crown Factory Service Information Shipping Address: Crown Factory Service, 1718 W. Mishawaka Rd., Elkhart, IN 46517 SRA #: __________________(If sending product to Crown factory service.) Serial Number: _____________________ Individual or Business Name: _____________________________________________________________________ Phone #: _____________________________________ E-Mail: _______________________________________ Street Address (please, no P.O.
  • Page 22 VCA-MC Series Amplifier Accessories THIS PAGE INTENTIONALLY LEFT BLANK Operation Manual page 22...
  • Page 23 VCA-MC Series Amplifier Accessories THIS PAGE INTENTIONALLY LEFT BLANK Operation Manual page 23...

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Vca-mc81-vcap4-vcap

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