Wohler AMP2A-4S User Manual
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Wohler AMP2A-4S User Manual

2u stereo audio speaker monitors
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AMP2A-4S and AMP2A-10S
2U Stereo Audio Speaker Monitors
with Four Selectable (AMP2A-4S) or Ten Selectable
(AMP2A-10S) Analog Stereo Inputs on Phoenix,
Selected Stereo Output on Two XLR, Dual
20-Segment LED Level Meters and Phase Indication
Title and Contents ......................................................
Introduction ......................................................................................
Description and Features ..................................................................
Section 2: Operation ..................................................
Installation .......................................................................................
Front Panel Features ........................................................................
Rear Panel Features .........................................................................
Section 3: Technical Information ............................
General Technical Observations ......................................................
Level Meter Settings and Specifications ...........................................
AMP2A-4S Interconnect Block Diagram .........................................
AMP2A-10S Interconnect Block Diagram ........................................
Document P/N 821554 Rev-B
User Manual
CONTENTS
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Summary of Contents for Wohler AMP2A-4S

  • Page 1: Table Of Contents

    AMP2A-4S and AMP2A-10S 2U Stereo Audio Speaker Monitors with Four Selectable (AMP2A-4S) or Ten Selectable (AMP2A-10S) Analog Stereo Inputs on Phoenix, Selected Stereo Output on Two XLR, Dual 20-Segment LED Level Meters and Phase Indication Document P/N 821554 Rev-B User Manual CONTENTS Title and Contents ............

  • Page 2: Introduction

    Introduction Congratulations on your selection of a Wohler Technologies product. We are confident it represents the best performance and value available, and we guarantee your satisfaction with it. If you have questions or comments you may contact us at: Wohler Technologies, Inc.

  • Page 3: Section 1: General Features And Specs

    AMP2A-4S and AMP2A-10S User Manual P/N 821554 Rev-B Section 1 General Features and Specifications Description Features Applications Specifications Other Options © 2003 Wohler Technologies Inc. ALL rights reserved...

  • Page 4: Description And Features

    (AMP2A-10S) analog stereo pair input sources for monitoring. The rear panel for the AMP2A-4S model features four selectable stereo pairs of analog inputs on balanced Phoenix connectors. The rear panel for the AMP2A-10S model features ten selectable stereo pairs of analog inputs on balanced Phoenix connectors. Both models offer an analog output of the selected stereo source on two XLR connectors on the rear panel.

  • Page 5: Applications, Specifications, And Other Options

    Section 1: General Features and Specifications Applications The AMP2A-4S and AMP2A-10S are ideally suited for use in VTR bays, mobile production vehicles, teleconferencing installations, multimedia systems, satellite links and cable TV facilities, and on-air radio studios. Designed and manufactured in the U.S., both models are backed by a strong warranty and a satisfaction guaranteed return policy.
  • Page 6 AMP2A-4S and AMP2A-10S User Manual P/N 821554 Rev-B (This page left intentionally blank) © 2003 Wohler Technologies Inc. ALL rights reserved...

  • Page 7: Section 2: Operation

    AMP2A-4S and AMP2A-10S User Manual P/N 821554 Rev-B Section 2 Operation Installation Front Panel Features Rear Panel Features © 2003 Wohler Technologies Inc. ALL rights reserved...
  • Page 8 AMP2A-4S and AMP2A-10S User Manual P/N 821554 Rev-B Section 2: Operation (This page left intentionally blank) © 2003 Wohler Technologies Inc. ALL rights reserved...

  • Page 9: Installation

    Connection of the audio feeds is straightforward. Please refer to the system interconnect block diagrams on pages 21 and 22 for clarification of the general signal paths into and out of the AMP2A-4S and AMP2A-10S units. Analog inputs via the 3-pin male Phoenix connectors are configured for 40K Ω balanced connections.

  • Page 10: Front Panel Features

    Section 2: Operation Front Panel Features Please refer to Figure-2a on the following page to familiarize yourself with the front panel features of the AMP2A-4S and AMP2A- 10S units. The following sections describe these features and are referenced, by number, to Figure-2a.
  • Page 11 AMP2A-4S and AMP2A-10S User Manual P/N 821554 Rev-B Section 2: Operation AMP2A-10S AMP2A-4S Front Panel Front Panel Figure-2a: Front Panel Features © 2003 Wohler Technologies Inc. ALL rights reserved...

  • Page 12: Rear Panel Features

    Section 2: Operation Rear Panel Features Please refer to Figure-2b on the following page to familiarize yourself with the rear panel features of the AMP2A-4S and AMP2A- 10S units. The following sections describe these features and are referenced, by letter, to Figure-2b.
  • Page 13 AMP2A-4S and AMP2A-10S User Manual P/N 821554 Rev-B Section 2: Operation AMP2A-10S AMP2A-4S Rear Panel Rear Panel Figure-2b: Rear Panel Features © 2003 Wohler Technologies Inc. ALL rights reserved...
  • Page 14 AMP2A-4S and AMP2A-10S User Manual P/N 821554 Rev-B Section 2: Operation © 2003 Wohler Technologies Inc. ALL rights reserved...

  • Page 15: Section 3: Technical Information

    AMP2A-4S and AMP2A-10S User Manual P/N 821554 Rev-B Section 3 Technical Information • General Technical Observations • Level Meter Settings and Specifications • LED Bargraph Driver PCB (919030) Description • Level Meter Bargraph "0" (Zero) Level Fine Adjustment • Level Meter Bargraph Peak LED Segment Adjustment •...

  • Page 16: General Technical Observations

    AMP2A-4S and AMP2A-10S User Manual P/N 821554 Rev-B Section 3: Technical Information General Technical Observations General Mechanical Observations Elimination of cabinet and component sympathetic vibrations (resonances) requires considerable attention to mechanical details. Because of this, and the physical constraints of the speaker’s acoustic enclosures, even minor changes to any of the mechanical details of the unit can seriously impair its acoustic performance.

  • Page 17: Level Meter Settings And Specifications

    AMP2A-4S and AMP2A-10S User Manual P/N 821554 Rev-B Section 3: Technical Information Level Meter Settings and Specifications Level Meter DIP Switch Settings Two DIP switch modules, accessed through holes in the top cover, allow the user to set the VU/PPM Display Mode and Input Level Gain Calibration.

  • Page 18: Led Bargraph Driver Pcb (919030) Description

    AMP2A-4S and AMP2A-10S User Manual P/N 821554 Rev-B Section 3: Technical Information LED Bargraph Driver PCB (919030) Description Input Stage and Level Calibration The PPM-2 display driver PCB circuit (P/N 919030) provides a total of 44 dB of visual audio level indication via a 20-segment LED bargraph.

  • Page 19: Level Meter Bargraph "0" (Zero) Fine Adjustment

    AMP2A-4S and AMP2A-10S User Manual P/N 821554 Rev-B Level Meter Bargraph "0" (Zero) Fine Adjustment 1) Removal of the Top Cover Remove the top cover screws (2 along upper front panel, 2 per each side, 3 along upper rear panel, 1 center top). The 919030 PCBs (2 each) are vertically mounted to chassis bottom just behind the front panel mounted LED bargraph displays;...

  • Page 20: Input Select Analog Switch Pcb (919013) Description

    AMP2A-4S and AMP2A-10S User Manual P/N 821554 Rev-B Section 3: Technical Information Input Select Analog Switch PCB (919013) Description Input selection from multiple sources is accomplished via a ten channel analog switch circuit. Connection to each source is facilitated by installing a three position plug-in "Phoenix" style connector on the end of the source cable. The Phoenix connector has screw clamps for the ground and a balanced pair.

  • Page 21: Amp2A-4S Interconnect Block Diagram

    AMP2A-4S and AMP2A-10S User Manual P/N 821554 Rev-B Section 3: Technical Information © 2003 Wohler Technologies Inc. ALL rights reserved...

  • Page 22: Amp2A-10S Interconnect Block Diagram

    AMP2A-4S and AMP2A-10S User Manual P/N 821554 Rev-B Section 3: Technical Information © 2003 Wohler Technologies Inc. ALL rights reserved...
  • Page 23 AMP2A-4S and AMP2A-10S User Manual P/N 821554 Rev-B Notes: © 2003 Wohler Technologies Inc. ALL rights reserved...
  • Page 24 AMP2A-4S and AMP2A-10S User Manual P/N 821554 Rev-B Wohler Technologies, Inc. You can now contact us at: 31055 Huntwood Avenue Wohler Hayward, CA 94544 Technologies, Inc. Phone: (510) 589-5676 Fax: (510) 870-0811 31055 Huntwood Avenue US Toll-Free: 1-888-596-4537 Hayward, CA 94544 web: www.wohler.com...

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Amp2a-10s

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