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© 2006 Wohler Technologies Inc. ALL rights reserved

15

AMP2A

and

AMP2A-2S

User Manual P/N

821553

Rev-

B

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

•

AMP2A Interconnect Block Diagram

•

AMP2A-2S Interconnect Block Diagram

Section 3

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Summary of Contents for AMP2A

Page 1: ...ons LED Bargraph Driver PCB 919030 Description Level Meter Bargraph 0 Zero Fine Adjustment Level Meter Bargraph Peak LED Segment Adjustment AMP2A Interconnect Block Diagram AMP2A 2S Interconnect Block Diagram AMP2A and AMP2A 2S 2U Stereo Audio Speaker Monitors with Two Analog Inputs and Loop through Outputs on XLR AMP2A or Two Pair Selectable Analog Inputs and Selected Stereo Outputs on XLR AMP2A ...

Page 2: ...eing walked on or pinched particularly at plugs convenience receptacles and the point where they exit from the apparatus 11 Only use attachments accessories specified by the manufacturer 12 Use only with the cart stand tripod bracket or table specified by the manufacturer or sold with the apparatus When a cart is used use caution when moving the cart apparatus combination to avoid injury from tip ...

Page 3: ... Inc ALL rights reserved 3 AMP2A and AMP2A 2S User Manual P N 821553 Rev B Sect 1 General Features and Specifications General Features and Specifications Description Features Applications Specifications Other Options Section 1 ...

Page 4: ...h on the front panel to allow selection of an additional pair of analog input sources The rear panel for the AMP2A model features two analog inputs on balanced XLR and unbalanced RCA connectors and two loop through outputs on XLR connectors The rear panel for the AMP2A 2S model features two selectable pairs of analog inputs on XLR inputs and a stereo output of the selected sources on two XLR conne...

Page 5: ...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 Hz including cabinet resonance typically less than 1 5 26 dBv balanced 90 dB 0 008 0 8 Gauss any adjacent surface 45 W 100 240VAC 50 60Hz Universal Physical Specifications Typical 1 6 Octave Audio Response Curve Level Meter Specifications Level Meter Typ...

Page 6: ... 2006 Wohler Technologies Inc ALL rights reserved 6 AMP2A and AMP2A 2S User Manual P N 821553 Rev B This page left intentionally blank ...

Page 7: ... 2006 Wohler Technologies Inc ALL rights reserved 7 AMP2A and AMP2A 2S User Manual P N 821553 Rev B Operation Installation Front Panel Features Rear Panel Features Section 2 ...

Page 8: ... 2006 Wohler Technologies Inc ALL rights reserved 8 AMP2A and AMP2A 2S User Manual P N 821553 Rev B Section 2 Operation This page left intentionally blank ...

Page 9: ...s 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 evenly around the unit Audio Connections Connection of the audio feeds is straightforward Ple...

Page 10: ...internal speakers or connected headphone Clock wise rotation of this control increases the loudness of the monitored audio Headphone Jack Select the headphone audio sources as you would for the internal speakers When you plug in headphones the speakers will mute This jack accepts a standard 1 4 phone type stereo plug Phase Indication LEDs These three LEDs offer instant verification of phase polari...

Page 11: ...S 1 R L 22 25 34 37 40 31 28 13 16 19 10 5 7 3 POWER PEAK SOURCE 3 0 1 2 FAST IN PHASE FAST OUT AVG ANALOG AUDIO MONITOR PANEL AMP2A 1 3 5 1 2 4 1 6 7 AVG 28 L 40 31 37 34 R WOHLER TECHNOLOGIES POWER SOURCE 5 16 19 25 22 7 10 13 2 1 0 3 1 PEAK 3 FAST OUT PHASE FAST IN 1 2 SOURCE AMP2A 2S MONITOR PANEL ANALOG AUDIO 1 3 5 1 2 4 1 6 7 8 AMP2A 2S FrontPanel AMP2A FrontPanel ...

Page 12: ...hese connectors is shown at bottom of this page Analog Input Connectors Unbalanced RCA AMP2A Only These two female RCAconnectors UNBALANCED IN CHANNEL A Left and CHANNELB RIGHT accept standard analog audio signals and are configured for unbalanced 47K Ω connections Pinout information for these connectors is shown at bottom of this page Note For each input section CHANNEL A Left or CHANNEL B RIGHT ...

Page 13: ...AC 50 60 Hz SERIAL NUMBER UNBALANCED IN BALANCED IN LOOP THRU CHANNEL A LEFT AMP2A AMP2A AMPPM AMP2A AMVU UNBALANCED IN BALANCED IN LOOP THRU CHANNEL B RIGHT 253408 01 A B D C C B D SOURCE 1 CHANNEL B RIGHT INTERNAL POWER UNDERWRITERS LABS LABEL ON SIDE SEE POWER SUPPLY 100 240 VAC 50 60 Hz SOURCE 1 SOURCE 2 CHANNEL A LEFT SOURCE 2 SELECTED OUTPUT CH A L CH B R 253409 01 AMP2A 2S A E E F AMP2A 2S ...

Page 14: ... 2006 Wohler Technologies Inc ALL rights reserved 14 AMP2A and AMP2A 2S User Manual P N 821553 Rev B Section 2 Operation This page left intentionally blank ...

Page 15: ...ical 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 AMP2A Interconnect Block Diagram AMP2A 2S Interconnect Block Diagram Section 3 ...

Page 16: ... via the balanced input stage in lieu of the XLR analog inputs on the basic unit Signal feed points for level meters and the phase indicator are immediately after the input 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 am...

Page 17: ...ory setting is 4 dBu but can be set for 6 dBu 0 dBu or 8 dBu by the user See the diagram below for settings Bargraph Display Modes DIP switch sections 3 and 4 determine how levels are displayed PPM or VU mode characteristics The factory setting is VU See the diagram below for settings Level meter type Segment quantity Meter display modes DIP switch selectable Level gain DIP switch selectable Level...

Page 18: ...d opening 3 allows the VU signal to drive the bargraph drivers This signal is generated by IC3a and associated components configured as an active filter to provide the proper VU characteristic Bargraph Driver The signal PPM or VU directly drives the LM3916 which drives the upper bargraph display IC4a provides an additional 16 dB of gain to the lower bargraph display driver LM3915 D1provides the re...

Page 19: ...eved for the increased input level To zero the meters for a lower input level you would turn the pots clockwise to increase the displayed level for any decreased input level Level Meter Bargraph Peak LED Segment 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 moun...

Page 20: ... PCB 919084 919030R Right Bargraph Driver PCB AMP2A Block Diagram L R Phase Indication 20 Segment LED Bargraph Level Meters Rev A 12 17 02 Analog In Unbalanced Channel A Left Loop Thru Output Analog In Balanced Rear Panel Rear Panel R L Connector Legend XLR F 3 Pin Female XLR M 3 Pin Male RCA Phono Female Analog Input Impedances XLR 200K Ω Balanced RCA 47K Ω Unbalanced Headphone Analog In Unbalanc...

Page 21: ...itch Rear Panel 1 2 1 2 Audio Amplifier PCB 919100 2 or 919164 Volume Left Side Speaker Right Side Speaker Balance Woofer Speaker Headphone Phase Indication PCB 919084 AMP2A 2S Block Diagram Rear Panel 2 1 L R Right Left L R Phase Indication 20 Segment LED Bargraph Level Meters Rev A 12 17 02 Connector Legend XLR F 3 Pin Female XLR M 3 Pin Male Analog Input Impedance XLR 200K Ω Balanced DIP Switch...

Page 22: ...55 HuntwoodAvenue Hayward CA 94544 Phone 510 589 5676 Fax 510 870 0811 US Toll Free 1 888 596 4537 web www wohler com e mail support wohler com You can now contact us at Wohler Technologies Inc 31055 Huntwood Avenue Hayward CA 94544 Phone 510 870 0810 Fax 510 870 0811 US Toll Free 1 888 596 4537 www wohler com support wohler com ...

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