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Alcons ALC4 User Manual

Ckass-g amplified loudspeaker controller
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Summary of Contents for Alcons ALC4

  • Page 2: Table Of Contents

    Table of contents ________________________________________________ 1. Introduction ____________________________________________________________________________________________ 3 2. Important safety instructions ______________________________________________________________________________ 6 3. Precautions_____________________________________________________________________________________________ 7 4. Installation _____________________________________________________________________________________________ 8 5. Overview ______________________________________________________________________________________________ 11 6. Connections ___________________________________________________________________________________________ 14 7. Operation _____________________________________________________________________________________________ 21 8. Safety ________________________________________________________________________________________________ 23 9. Service and support_____________________________________________________________________________________ 25 10.

  • Page 3: Introduction

    1. Introduction___________________________________________________ Dear customer, Congratulations on your purchase of an Alcons Audio ALC4 professional power amplifier, and thank you for your confidence in Alcons products. We are very honoured to welcome you to the growing family of Alcons ambassadors! For your safety, please read the Important safety instructions and the Precautions section before installing and operating the amplifier.
  • Page 4 (passive system). High efficient Class-G power stages The ALC4 is equipped with two class-G power amplifiers for increased thermal efficiency, while also saving weight on the heat sinks and the power supply. SIS Signal Integrity Sensing SIS is a unique feature installed in all Alcons amplifiers that senses the signals arriving at the loudspeaker terminals, and so compensating for errors introduced by cable resistance and self-induction.
  • Page 5 RF and ultrasonic protection A RF sensing circuit is continuously monitoring the inputs of the ALC4 to detect ultrasonic energy. When RF energy is detected, the inputs of the ALC4 are muted to prevent damaging your loudspeakers or the amplifier.

  • Page 6: Important Safety Instructions

    The exclamation point within a triangle is intended to alert the user to the presence of important operating instructions in the literature accompanying the product. ALC4 User’s Manual. Rev. 0...

  • Page 7: Precautions

    - Refer servicing to qualified service personnel. Servicing is required when the amplifier has been damaged in any way, liquid has been spilled on or into the amplifier, does not operate normally or has been dropped. - Do not series or parallel connect an amplifier output with any other amplifier output. Connecting outputs together can cause damage to the amplifiers. ALC4 User’s Manual. Rev. 0...

  • Page 8: Installation

    Unpacking Carefully open the shipping carton and inspect the amplifier. Every Alcons amplifier is thoroughly tested and inspected before leaving the factory and should arrive in perfect condition. If you find any damage, notify the shipping company immediately. Only you, the consignee, may initiate a claim for shipping damage.

  • Page 9: Cooling And Ventilation

    Cooling and ventilation The ALC4 amplifier uses forced air cooling in order to maintain a low operating temperature. In the ALC4 the cooling air enters at the front and the hot air leaves the amplifier at the left and right side. The reason for this is that the air outside the rack is usually cooler than inside, and therefore the amplifiers can run at higher continuous power levels without thermal problems.
  • Page 10 Place the SDP modules with the component-side up in the SDP connectors. The upper connector is for channel 1 or mono bridge mode operation, the lower one is for channel 2. The modules lock into position and do not need to be secured. The ALC4 automatically routes the signals through the modules once they have been inserted.

  • Page 11: Overview

    When these LEDs are constantly illuminated, the amplifier is in ‘protect’ mode and the signal to the amplifier is muted. This indicates either: High temperatures in the amplifier’s output section or power supply, RF on the input, DC on the output. These LEDs also illuminate during power-up. ALC4 User’s Manual. Rev. 0...
  • Page 12 13 Air inlet grill Cooling air inlet grill. Make sure this inlet remains clear to allow unrestricted air intake. 14 AC power switch This control switches the mains supply for the amplifier on or off. Rear panel ALC4 User’s Manual. Rev. 0...
  • Page 13 10 Link CH1 output This three pole male XLR connector is internally hardwired to the channel 1 input connector. You can use this connector to ‘daisy chain’ the channel one input signal to the next amplifier. ALC4 User’s Manual. Rev. 0...

  • Page 14: Connections

    Loudspeakers are connected using Speakon® connectors. For each channel two Speakon® connectors are available which are connected in parallel. Due to the SIS (Signal Integrity Sensing) feature on the ALC4, there are four connections per channel instead of two. The two extra wires are used for voltage sensing at the loudspeaker terminals.
  • Page 15 The Speakon® connector is wired as follows: Speakon® male plug viewed from the wiring side. 1+ = Output + 1- = Output – 2+ = Sense + 2- = Sense – Normal loudspeaker connection. Connection without SIS. ALC4 User’s Manual. Rev. 0...
  • Page 16 In the next table a few percentages are converted to dBs: % loss dB loss 0.1 dB 0.2 dB 0.4 dB 10 % 0.9 dB 15 % 1.4 dB 20 % 1.9 dB 25 % 2.5 dB 30 % 3.1 dB 35 % 3.7 dB ALC4 User’s Manual. Rev. 0...
  • Page 17 SIS to the channel 1 and channel 2 outputs, and your signals to the channel 1 and channel 2 inputs. In this mode each channel can have its own SDP module and uses its own gain control. ALC4 User’s Manual. Rev. 0...
  • Page 18 SIS to the channel 1 and channel 2 outputs, and your signal source to the channel 1 input. In this mode each channel can have its own SDP module and uses its own gain control. ALC4 User’s Manual. Rev. 0...
  • Page 19 2 outputs as shown above. Connect your signal source to the channel 1 input. In this mode only the channel 1 SDP module can be used. The channel 1 gain control sets the gain for the entire amplifier. Remember, that in bridge mode the amplifier cannot cope with loads lower than 4 Ω. ALC4 User’s Manual. Rev. 0...
  • Page 20 Data port The Data port located on the rear panel of the ALC4, is the connection for remote controlling the amplifier. Through the 15 pin high density D-connector, signals indicating the status of the ALC4 are available for the remote control unit. The input signals to the amplifier can also be supplied through this connector.

  • Page 21: Operation

    DC. Usually this indicates a defect in the amplifier and the need for servicing. 3. High temperature. When it is flashing, the output section of the related channel is between 85 and 90 degrees centigrade (185 - 194° F),and the ALC4 has shut down its class-G stage.

  • Page 22: Ground Lift Switch

    Gain is controlled by the channel 1 gain potentiometer. In this mode only the channel 1 SDP module can be used. You can use standard SDP protection modules in bridge mode. The ALC4 automatically recalculates the limit thresholds to compensate for the extra gain of the amplifier.

  • Page 23: Safety

    Temperature protection The ALC4 is cooled by a large 120 mm (4.7 in.) variable speed fan located behind the grill on the front panel. Fan speed increases only as required by measured temperatures, keeping fan noise to a minimum. Under extreme thermal load the fan will force a very large volume of air through the heat sinks. If either one of the heat sinks or the toroidal power transformers surpasses the maximum allowed temperature, the ALC4 temperature protection circuits become active.
  • Page 24 AC inrush limiter The AC inrush limiter is active when the ALC4 is switched on. The AC mains inrush current is limited to a safe value. The second power supply is switched on with a two second delay. However, take care not to switch-on too many amplifiers at the same time, or you may risk that the main fuses of your AC distribution will blow.

  • Page 25: Service And Support

    Summary Alcons Audio BV warrants the original purchaser and any subsequent owner of each new Alcons product, for a period of three years from the date of the original purchase by the original purchaser that the new Alcons product is free of defects in materials and workmanship. Alcons Audio BV warrants the new Alcons product regardless of the reason for failure, except as excluded in this warranty.
  • Page 26 9. Service and support ____________________________________________ Contact information Mailing address: Alcons Audio BV De Corantijn 69 1689 AN ZWAAG The Netherlands Telephone / Facsimile: Telephone: +31 (0)229 283090 Fax.: +31 (0)229 283099 World Wide Web: http://www.alconsaudio.com E-mail: info@alconsaudio.com ALC4 User’s Manual. Rev. 0...

  • Page 27: Specifications

    Weight ____________________________________________________________________________________ 33.5 kg / 73 lb Housing _________________________________19 inch rack mount, 3 HU, 457 mm / 18 inch deep behind the mounting surface Dimensions _________________________________________ 132x482x500 mm / 5.2x19x19.7 inch (hxwxd) including rack handles ALC4 User’s Manual. Rev. 0...

  • Page 28: Block Diagram

    11. Block diagram ________________________________________________ ALC4 User’s Manual. Rev. 0...

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