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Title and Contents

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Introduction .........................................................................................

Section 1: Features, Specs, and Installation

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Description and Features ......................................................................

Applications and Specifications ............................................................

Installation ...........................................................................................

Section 2: Operation

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Front Panel Features ............................................................................

Rear Panel Features ..............................................................................

Audio Amplifier and Speaker Configuration .........................................

Balance Control Characteristics .............................................................

Section 3: Technical Information

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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-

CONTENTS

User Manual

ECO-2507 (08/11/04)

Summary of Contents for AMP2-VS

Page 1: ...tings 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 S...

Page 2: ... CA 94080 650 589 5676 Fax 650 589 1355 web www wohler com e mail support wohler com 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 If you have questions or comments you may contact us at All rights reserved Copyright held by Wohler T...

Page 3: ...es Inc ALL rights reserved 3 AMP2 VS and AMP2 VSA User Manual P N 821583 Rev A Sect 1 General Features and Specifications Features Specs and Installation Description Features Applications Specifications Installation Section 1 ...

Page 4: ...stry standard SDI digital audio signals while the AMP2 VSA is also capable of processing up to four analog audio signals Two banks of four buttons on the front panel are used to independently assign from one to four summed channels to each of the two speaker channels left and right SDI signal status is indicated by one bi color red green LED Features include volume and balance controls power indic...

Page 5: ...ing PowerConsumption AverageMaximum AC Mains Input SDI BNC Analog XLR VSA only XLR 70K Ω bal AMP2 VSA Only BNC 75 Ω unbalanced 104 dB SPL 14 W transient 10 W continuous 35 W transient 25 W continuous 80 Hz 16 kHz 5 dB 10 dB 40 Hz 20 kHZ 0 dBv balanced 10 dB unbalanced Better than 68 dB below full output Less than 0 15 at any level below input threshold 6 or less at worst case frequencies above 120...

Page 6: ... be required to stop vibrations external to the unit Mechanical Bracing Even though the unit is fairly heavy the chassis is securely attached to the front panel at eight points along its surface not just at the four corners of the chassis ears This feature will reduce or eliminate rear bracing requirements in many mobile portable applications The weight of internal components is distributed fairly...

Page 7: ...nologies Inc ALL rights reserved 7 AMP2 VS and AMP2 VSA User Manual P N 821583 Rev A Operation Front Panel Features Rear Panel Features Audio Amplifier and Speaker Configuration Balance Control Characteristics Section 2 ...

Page 8: ...icate they are selected Operation for channel selection for each bank of four buttons is as follows Single Channel Select Press and release a single channel button to select that channel and deselect any previous selection Pressing and releasing the selected channel button again will deselect it Multi Channel Select Summing Press and hold down a desired channel button then press other channel butt...

Page 10: ... sufficient for proper phase monitoring While it is normal for stereo signals to contain some intermittant instantaneous out of phase and in phase conditions FAST LEDs a steady RED glow of the AVG LED indicates an out of phase alarm condition Balance Control This control changes the volume balance between the left and right speaker channels Note that this control attenuates the signal from the sou...

Page 12: ...n unbalanced 75 Ω connection The unit de embeds and monitors sub group 1 channels 1 2 and sub group 2 channels 3 4 of SDI Group ID 1 Note that in the AMP2 VSA model the SDI input is monitored only when the Analog Digital Source Select Switch Item 5 page 8 is set to DIGITAL The female BNC SDI OUT loop through connector outputs a reclocked regenerated copy of the signal entering the SDI IN input con...

Page 14: ... balance control attenuates the signal from the source so that the left and right bass frequencies summed together and reproduced in the woofer channel will also respond to the balance control Example If an audio signal of a voice speaking English is fed to the left A input and a voice speaking Spanish is fed to the right B input then the left speaker channel will reproduce the midrange and high r...

Page 15: ...onverter 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 Section 3 ...

Page 16: ...ut stage and before the volume control section The signal pick off for the headphones is after the volume and balance controls Speaker muting is controlled by circuitry that senses connection of headphones to the jack The power amps are attached to an aluminum heatsink plate which is also connected to the circuit common for these devices The heatsink plate forms an operational module separate from...

Page 17: ... 1 are demuxed for conversion to analog Access to SDI Group I D 2 3 or 4 is optional and may be specified at the time of order SDI to Analog Converter Module PCB 919068 PCB 919068 Specifications Inputcharacteristics Receivertype Sensitivityperformance SDIinputlevel Inputformats Audiosamplingrate SDIoutputtype SDIoutput SDIoutputlevel Max outputofanalogout Analogout ofdigitalsource S N THD fulloutp...

Page 18: ...o make measurement of the FULL balanced output NOT just between one of the outputs and ground 5 Locate trim pots P5 P6 P7 and P8 see Figure 3a below Adjust P8 channel 1 through P5 channel 4 for the desired analog level corresponding to the digital signal amplitude being supplied to the unit For example if your house Analog Digital correspondence is for a 18 dBfs digital level to correspond to an a...

Page 19: ...displayed on the LED bargraphs Factory setting is 4 dB See DIP switch diagram below for settings Bargraph Display Mode DIP switch sections 4 and 5 determine how peak levels are displayed for the associated meters on the front panel There are four possible settings VU Only VU PPM Floating Segment PPM Only and PPM PPM Floating Segment The VU Only selection has a VU floating segment when a Peak Hold ...

Page 20: ...n Rise Time is 10 ms 2 dB Return Fall Time is 2 8 seconds 24 dB Integration Rise Time is 5 ms 2 dB Return Fall Time is 1 5 seconds 20 dB Integration Rise Time is a single sample Return Fall Time is 1 5 seconds 20 dB IEC268 10 Type 1 IEC268 10 Type 2 DIN 4506 Single Sample 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...

Page 21: ... AMP2 VS and AMP2 VSA User Manual P N 821583 Rev A Level Meter Internal 10 Position DIP Switch Module see page 20 Level Meter Rear Panel 6 Position DIP Switch Module see page 19 Level Meter DIP Switch Locations 919174 PCB Section 3 Technical Information ...

Page 22: ... Scale standard Since it is sometimes helpful to observe phase relationships between two signals being monitored a Phase Correlation feature can be implemented within the lower section of an existing bargraph pair in the 53 segment LED bargraph level meters used in the AMP2 units This feature may be turned ON and OFF by setting the Level Meter Internal 10 Position DIP Swich module page 20 Below is...

Page 25: ...MP2 VSA User Manual P N 821583 Rev A 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 NOTES ...

Page 26: ...s Inc ALL rights reserved 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 ...

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