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2U Digital Audio Speaker Monitor
With Two Selectable AES Inputs on BNC,
Two Analog Inputs on XLR, Two Selected
Analog Stereo Outputs on XLR, Two Mechanical
VU (AVU) or PPM (APP) Level Meters,
Title and Contents .......................................................................
Introduction .........................................................................................
Section 1: Features, Specs, and Installation ....................
Description and Features ......................................................................
Applications and Specifications ............................................................
Installation ...........................................................................................
Section 2: Operation .................................................................
Front Panel Features ............................................................................
Rear Panel Features ..............................................................................
Audio Amplifier and Speaker Configuration .........................................
Balance Control Characteristics .............................................................
Section 3: Technical Information .........................................
General Technical Observations ............................................................
AES to Analog Converter PCB (919117) ...............................................
AES Mute-On-Error Jumper Location (919117 PCB) .............................
PPM Meter Specifications and Level Threshold Settings ........................
VU Meter Specifications and Level Threshold Adjustment......................
AMP2-DA/AVU and AMP2-DA/APP Interconnect Block Diagram .............
AMP2-DA/AVU and
AMP2-DA/APP
and Phase Indication
Document P/N 821584 Rev-A
User Manual
CONTENTS
ECO-2551 (08/13/04)
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Table of Contents
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Summary of Contents for Wohler AMP2-DA
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Page 1: Table Of Contents
General Technical Observations ............AES to Analog Converter PCB (919117) ..........AES Mute-On-Error Jumper Location (919117 PCB) ......PPM Meter Specifications and Level Threshold Settings ......VU Meter Specifications and Level Threshold Adjustment...... AMP2-DA/AVU and AMP2-DA/APP Interconnect Block Diagram ..... ECO-2551 (08/13/04) -
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: Features, Specs, And Installation
AMP2-DA/AVU and AMP2-DA/APP User Manual P/N 821584 Rev-A Section 1 Features, Specs, and Installation Description Features Applications Specifications Installation © 2004 Wohler Technologies Inc. ALL rights reserved... - Page 4 AMP2-DA/APP Series Front Panel Description The AMP2-DA/AVU and AMP2-DA/APP are monitors capable of audibly monitoring two source channels through a stereo speaker system while simultaneously visually monitoring the two channels on two high quality mechanical audio level meters. The AMP2-DA/AVU model features mechanical meters with VU ballistic characteristics and the AMP2-DA/APP model features these meters with PPM ballistic characteristics.
- Page 5 Section 1: Features, Specs, and Installation Applications The AMP2-DA/AVU and AMP2-DA/APP 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.
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Page 6: Installation
AMP2-DA/AVU and AMP2-DA/APP User Manual P/N 821584 Rev-A Section 1: Features, Specs, and Installation Installation Mounting The unit should be mounted where convenient for operating persons, ideally at approximately ear/eye level for best high frequency response and visual observation of the level meters. Its superior magnetic shielding eliminates concerns about locating it adjacent to most types of CRT monitors, including even high-resolution color monitors. -
Page 7: Section 2: Operation
AMP2-DA/AVU and AMP2-DA/APP User Manual P/N 821584 Rev-A Section 2 Operation Front Panel Features Rear Panel Features Audio Amplifier and Speaker Configuration Balance Control Characteristics © 2004 Wohler Technologies Inc. ALL rights reserved... - Page 8 Section 2: Operation Front Panel Features Please refer to Figure-2a on the facing page to familiarize yourself with the front panel features of the AMP2-DA/AVU and AMP2- DA/APP units. The following sections describe these features and are referenced, by number, to Figure-2a.
- Page 9 AMP2-DA/AVU and AMP2-DA/APP User Manual P/N 821584 Rev-A Section 2: Operation Figure-2a: Front Panel Features © 2004 Wohler Technologies Inc. ALL rights reserved...
- Page 10 AMP2-DA/AVU and AMP2-DA/APP User Manual P/N 821584 Rev-A Section 2: Operation Front Panel Features (Continued) Phase Indication LEDs These three LEDs indicate the instantaneous and average phase (polarity) conditions between the two signals in the channel pair (or downmix) assigned to the left and right speaker channels. The two smaller LEDs labeled FAST show instantaneous phase relationships in the signal.
- Page 11 AMP2-DA/AVU and AMP2-DA/APP User Manual P/N 821584 Rev-A Section 2: Operation Figure-2a: Front Panel Features © 2004 Wohler Technologies Inc. ALL rights reserved...
- Page 12 Section 2: Operation Rear Panel Features Please refer to Figure-2b on the facing page to familiarize yourself with the rear panel features of the AMP2-DA/AVU and AMP2-DA/ APP unit. The following sections describe these features and are referenced, by letter, to Figure-2b.
- Page 13 AMP2-DA/AVU and AMP2-DA/APP User Manual P/N 821584 Rev-A Section 2: Operation Figure-2b: Rear Panel Features © 2004 Wohler Technologies Inc. ALL rights reserved...
- Page 14 Section 2: Operation AMP2-DA/AVU and AMP2-DA/APP User Manual P/N 821584 Rev-A Rear Panel Features (Continued) Selected Analog Output Connectors These two 3-pin male XLR connectors are analog outputs of the selected source as assigned to the left and right speakers.
- Page 15 Section 2: Operation AMP2-DA/AVU and AMP2-DA/APP User Manual P/N 821584 Rev-A Figure-2b: Rear Panel Features © 2004 Wohler Technologies Inc. ALL rights reserved...
- Page 16 AMP2-DA/AVU and AMP2-DA/APP User Manual P/N 821584 Rev-A Section 2: Operation Audio Amplifier and Speaker Configuration General Description All models in the AMP Series contain high performance transducers (speakers) driven by three power amplifiers; two amplifier/ driver combinations handle midrange and high frequency information in the left and right (stereo) speaker channels, while the third amplifier channel sums the left and right channel information below the 500 Hz crossover point in the woofer (bass) speaker(s).
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Page 17: Section 3: Technical Information
AMP2-DA/AVU and AMP2-DA/APP User Manual P/N 821584 Rev-A Section 3 Technical Information General Technical Observations AES to Analog Converter Module PCB (919117) AES Mute-On-Error Jumper Location (919117) PPM Level Meter Specifications and Level Threshold Settings VU Level Meter Specifications and Level Threshold Adjustment AMP2-DA/AVU and AMP2-DA/APP Interconnect Block Diagram ©... - Page 18 AMP2-DA/AVU and AMP2-DA/APP User Manual P/N 821584 Rev-A 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 19 AMP2-DA/AVU and AMP2-DA/APP User Manual P/N 821584 Rev-A Section 3: Technical Information AES to Analog Converter Module PCB (919117) There are four primary and three ancillary sections comprising the 919117 PCB (AES/EBU digital to analog converter): 1) Input source selection.
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Page 20: Aes Mute-On-Error Jumper Location (919117 Pcb)
AMP2-DA/AVU and AMP2-DA/APP User Manual P/N 821584 Rev-A Section 3: Technical InformationMute-On- AES Mute-On-Error Jumper Location (919117) Installing a jumper at Installing a jumper at H12 will mute the audio H12 will mute the audio if errors are detected. if errors are detected. - Page 21 AMP2-DA/AVU and AMP2-DA/APP User Manual P/N 821584 Rev-A Section 3: Technical Information PPM Level Meter Specifications and Level Threshold Settings The two (one per meter) Level Threshold DIP switches in the APP (PPM) unit are only accessible by removal of the top cover. Each DIP switch is physically located on the inside front panel above the level meter to which it is dedicated.
- Page 22 AMP2-DA/AVU and AMP2-DA/APP User Manual P/N 821584 Rev-A Section 3: Technical Information © 2004 Wohler Technologies Inc. ALL rights reserved...
- Page 23 AMP2-DA/AVU and AMP2-DA/APP User Manual P/N 821584 Rev-A NOTE: PCB layout and schematic support documentation is available upon request. Wohler Technologies, Inc. Wohler Technologies, Inc. 713 Grandview Drive 31055 Huntwood Avenue South San Francisco, CA 94080 Hayward, CA 94544 650 589-5676 Fax: 650 589-1355...
- Page 24 AMP2-DA/AVU and AMP2-DA/APP User Manual P/N 821584 Rev-A Wohler Technologies, Inc. Wohler Technologies, Inc. 713 Grandview Drive 31055 Huntwood Avenue South San Francisco, CA 94080 Hayward, CA 94544 650 589-5676 Fax: 650 589-1355 Phone: (510) 870-0810 Fax: (510) 870-0811 web: www.wohler.com US Toll-Free: 1-888-596-4537 e-mail: support@wohler.com...
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