User manual

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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 ............................................................

SDI to Analog Converter Module (919068 PCB) ....................................

SDI D/A Gain Calibration Fine Adjustment (919068 PCB) .....................

Level Meter Rear Panel 6-Position DIP Switch Settings .........................

Level Meter Internal 10-Position DIP Switch Settings ............................

Level Meter DIP Switch Locations ........................................................

Level Meter Alternative Scales ..............................................................

Level Meter Phase Correlation Featrure .................................................

AMP2-VS Interconnect Block Diagram .................................................

AMP2-VSA Interconnect Block Diagram ...............................................

AMP2-VS and AMP2-VSA

2U Digital Audio Speaker Monitor

With One SDI Input and Output on BNC,

Four Analog Out From SDI on Phoenix, Four

Analog Inputs on XLR (-VSA Only), Two Selected Analog

Stereo Outs on XLR, Four 53-Segment Level Meters,

Summable Channel Assignment, and Phase Indication

Document P/N 821583 Rev-A

CONTENTS

User Manual

ECO-2507 (08/11/04)

Summary of content (26 pages)

PAGE 1
AMP2-VS and AMP2-VSA 2U Digital Audio Speaker Monitor With One SDI Input and Output on BNC, Four Analog Out From SDI on Phoenix, Four Analog Inputs on XLR (-VSA Only), Two Selected Analog Stereo Outs on XLR, Four 53-Segment Level Meters, Summable Channel Assignment, and Phase Indication Document P/N 821583 Rev-A User Manual CONTENTS Title and Contents ....................................................................... 1 Introduction ......................................................................
PAGE 2
AMP2-VS and AMP2-VSA User Manual P/N 821583 Rev-A Introduction Congratulations on your selection of a Wohler Technologies AMP2-VS or AMP2-VSA audio monitor unit. We are confident it represents the best performance and value available, and we guarantee your satisfaction with it. Introduction If you have questions or comments you may contact us at: Wohler Technologies, Inc. 713 Grandview Drive South San Francisco, CA 94080 650 589-5676 Fax: 650 589-1355 web: www.wohler.com e-mail: support@wohler.
PAGE 3
AMP2-VS and AMP2-VSA User Manual P/N 821583 Rev-A Sect. 1: General Features and Specifications Section 1 Features, Specs, and Installation Description Features Applications Specifications Installation © 2004 Wohler Technologies Inc.
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AMP2-VS and AMP2-VSA User Manual P/N 821583 Rev-A Section 1: Features, Specs, and Installation AMP2-VS and AMP2-VSA Powered Audio Monitors AMP2-VS Front Panel AMP2-VSA Front Panel Description The AMP2-VS and AMP2-VSA are monitors capable of audibly monitoring up to four source channels de-embedded from an industry standard SDI bitstream through a stereo speaker system while simultaneously visually monitoring all four channels of the selected source via four high-resolution 53-segment LED bargraph level
PAGE 5
AMP2-VS and AMP2-VSA User Manual P/N 821583 Rev-A Section 1: Features, Specs, and Installation Applications The AMP2-VS and AMP2-VSA 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
AMP2-VS and AMP2-VSA User Manual P/N 821583 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
AMP2-VS and AMP2-VSA User Manual P/N 821583 Rev-A Section 2 Operation Front Panel Features Rear Panel Features Audio Amplifier and Speaker Configuration Balance Control Characteristics © 2004 Wohler Technologies Inc.
PAGE 8
AMP2-VS and AMP2-VSA User Manual P/N 821583 Rev-A 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-VS and AMP2-VSA units. The following sections describe these features and are referenced, by number, to Figure-2a. 1 2 3 4 Speakers The AMP2 Series monitors feature two mid-range speakers (left and right) and one woofer speaker.
PAGE 9
AMP2-VS and AMP2-VSA User Manual P/N 821583 Rev-A AMP2-VSA Section 2: Operation AMP2-VS Figure-2a: Front Panel Features © 2004 Wohler Technologies Inc.
PAGE 10
AMP2-VS and AMP2-VSA User Manual P/N 821583 Rev-A Section 2: Operation Front Panel Features 9 (Continued) Phase Indication LEDs These three LEDs indicate the instantaneous and average phase (polarity) conditions between the channels assigned to the left and right speaker channels. The two smaller LEDs labeled FAST show instantaneous phase relationships in the signal. The larger LED labeled AVG will indicate the average phase condition.
PAGE 11
AMP2-VS and AMP2-VSA User Manual P/N 821583 Rev-A AMP2-VSA Section 2: Operation AMP2-VS Figure-2a: Front Panel Features © 2004 Wohler Technologies Inc.
PAGE 12
AMP2-VS and AMP2-VSA User Manual P/N 821583 Rev-A 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-VS and AMP2-VSA unit. The following sections describe these features and are referenced, by letter, to Figure-2b. A Power Connector B Analog Output (From SDI IN) Connectors (1-4) Attach a standard IEC-320 power cord between this connector and mains power (100 - 250VAC, 50/60 Hz).
PAGE 13
AMP2-VS and AMP2-VSA User Manual P/N 821583 Rev-A AMP2-VSA Section 2: Operation AMP2-VS Figure-2b: Rear Panel Features © 2004 Wohler Technologies Inc.
PAGE 14
AMP2-VS and AMP2-VSA User Manual P/N 821583 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) spe
PAGE 15
AMP2-VS and AMP2-VSA User Manual P/N 821583 Rev-A Section 3 Technical Information General Technical Observations SDI to Analog Converter Module PCB (919068 PCB) SDI D/A Gain Calibration Fine Adjustment (919068 PCB) Level Meter Rear Panel 6-Position DIP Switch Settings Level Meter Internal 10-Position DIP Switch Settings Level Meter DIP Switch Locations Level Meter Alternative Scales Level Meter Phase Correlation Feature AMP2-VS Interconnect Block Diagram AMP2-VSA Interconnect Block Diagram © 2004 Wohler T
PAGE 16
AMP2-VS and AMP2-VSA User Manual P/N 821583 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 17
AMP2-VS and AMP2-VSA User Manual P/N 821583 Rev-A Section 3: Technical Information SDI to Analog Converter Module PCB (919068 PCB) The 919068 (SDI to analog converter PCB) allows selected Wohler Technologies audio monitoring systems to be connected directly to a serial digital (SDI) video signal containing embedded audio. Two levels of component signals (eg.
PAGE 18
AMP2-VS and AMP2-VSA User Manual P/N 821583 Rev-A Section 3: Technical Information SDI D/A Gain Calibration Fine Adjustment (919068 PCB) The digital gain calibration is set at the factory for +4 dB (analog) = -20 dBFS (digital). Three other values (+8 = -20, +6 = -9, and 0 = -18) may also be user selected via a DIP switch on the rear panel (Item C, page 12).
PAGE 19
AMP2-VS and AMP2-VSA User Manual P/N 821583 Rev-A Section 3: Technical Information Level Meter Rear Panel 6-Position DIP Switch Settings Line Level (Auto) Calibration, Reference Level, and Display Mode This DIP switch sets the Line Level Calibration, Reference Level, and PPM/VU Display Mode. See the descriptions and diagram below for setting information. Line Level (Auto) Calibration: The unit is calibrated at the factory. To recalibrate: 1) Turn on the power.
PAGE 20
AMP2-VS and AMP2-VSA User Manual P/N 821583 Rev-A Section 3: Technical Information Level Meter Internal 10-Position DIP Switch Settings This 10-position DIP switch is accessed by removing the top cover of the AMP unit and is located on the 919174 PCB (the same PCB on which the 6-position rear panel DIP switch is located). See page 21 for a diagram of the 919174 PCB and the DIP switch locations.
PAGE 21
AMP2-VS and AMP2-VSA User Manual P/N 821583 Rev-A Section 3: Technical Information Level Meter DIP Switch Locations Level Meter Rear Panel 6-Position DIP Switch Module (see page 19) 919174 PCB Level Meter Internal 10-Position DIP Switch Module (see page 20) © 2004 Wohler Technologies Inc.
PAGE 22
AMP2-VS and AMP2-VSA User Manual P/N 821583 Rev-A Section 3: Technical Information Level Meter Alternative Scales The standard scale used on the AMP2A-VSD/-VSDA level meters (53-segment) is the Extended VU scale (see diagram below). However, if alternative scale characteristics are selected for the level meters using the Level Meter Internal 10-Position DIP Switch (page 20), it is recommended that a label with the appropriate scale be applied to the front panel LED bargraph level meters.
PAGE 23
Section 3: Technical Information AMP2-VS Interconnect Block Diagram AMP2-VS and AMP2-VSA User Manual P/N 821583 Rev-A © 2004 Wohler Technologies Inc.
PAGE 24
AMP2-VSA Interconnect Block Diagram AMP2-VS and AMP2-VSA User Manual P/N 821583 Rev-A 24 © 2004 Wohler Technologies Inc.
PAGE 25
AMP2-VS and AMP2-VSA User Manual P/N 821583 Rev-A NOTES: NOTE: PCB layout and schematic support documentation is available upon request. Wohler Technologies, Inc. 713 Grandview Drive South San Francisco, CA 94080 650 589-5676 Fax: 650 589-1355 web: www.wohler.com e-mail: support@wohler.com © 2004 Wohler Technologies Inc.
PAGE 26
AMP2-VS and AMP2-VSA User Manual P/N 821583 Rev-A Wohler Technologies, Inc. 713 Grandview Drive South San Francisco, CA 94080 650 589-5676 Fax: 650 589-1355 web: www.wohler.com e-mail: support@wohler.com 26 © 2004 Wohler Technologies Inc.