Wohler AMP2A-10S User Manual Download Page 8 | Manualshive

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© 2003 Wohler Technologies Inc. ALL rights reserved

8

AMP2A-4S

and

AMP2A-10S

User Manual P/N

821554

Rev-

B

Section 2: Operation

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Summary of Contents for AMP2A-10S

Page 1: ...ription Level Meter Bargraph 0 Zero Fine Adjustment Level Meter Bargraph Peak LED Segment Adjustment Input Select Analog Switch PCB 919013 Description AMP2A 4S Interconnect Block Diagram AMP2A 10S Interconnect Block Diagram 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 ...

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: ...nc ALL rights reserved 3 AMP2A 4S and AMP2A 10S User Manual P N 821554 Rev B Sect 1 General Features and Specifications General Features and Specifications Description Features Applications Specifications Other Options Section 1 ...

Page 4: ...ont panel to allow selection of one of four AMP1A 4S or one of ten 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...

Page 5: ...ced 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 Type Meter Dy...

Page 6: ... 2003 Wohler Technologies Inc ALL rights reserved 6 AMP2A 4S and AMP2A 10S User Manual P N 821554 Rev B This page left intentionally blank ...

Page 7: ... 2003 Wohler Technologies Inc ALL rights reserved 7 AMP2A 4S and AMP2A 10S User Manual P N 821554 Rev B Operation Installation Front Panel Features Rear Panel Features Section 2 ...

Page 8: ... 2003 Wohler Technologies Inc ALL rights reserved 8 AMP2A 4S and AMP2A 10S User Manual P N 821554 Rev B Section 2 Operation This page left intentionally blank ...

Page 9: ... 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 evenly around the unit Audio Connections Conne...

Page 10: ...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 polarity conditions in the pair of channels selected for monitoring in the Left Right channel speakers There are three LEDs the two smaller LEDs labeled FAST IN and FAST OUT show instantaneous pha...

Page 11: ...nel AVG 31 L 40 37 34 R WOHLER TECHNOLOGIES POWER 7 19 25 22 28 10 13 16 1 0 1 5 3 PEAK 2 3 SOURCE FAST OUT PHASE FAST IN 10 1 2 3 4 5 6 7 8 9 SOURCE AMP2A 10S MONITOR PANEL ANALOG AUDIO 1 3 1 5 2 4 6 1 7 8 1 3 1 5 2 4 6 1 7 8 AVG 5 WOHLER TECHNOLOGIES L 28 R 40 37 34 31 16 25 22 19 10 13 7 POWER SOURCE 1 3 1 0 2 PEAK 3 FAST IN FAST OUT PHASE AMP2A 4S SOURCE ANALOG AUDIO MONITOR PANEL 3 1 2 4 ...

Page 12: ...ch on the front panel Item 8 page 10 Connector pinout information is silk screened just above each input connector Analog Input Connectors Balanced Phoenix AMP2A 10S These 3 pin male Phoenix connectors INPUTS CHANNEL A LEFT and CHANNEL B RIGHT accept standard analog audio signals and are configured for balanced 40K Ω connections The two banks of inputs are comprised of ten connectors each for a to...

Page 13: ...LEFT INTERNAL POWER UNDERWRITERS LABS LABEL ON SIDE SEE POWER SUPPLY NUMBER SERIAL 50 60 Hz 100 240 VAC 1 2 3 4 INPUTS 1 2 3 AMP2A 4S CHANNEL B RIGHT SELECTED OUTPUT 253410 01 4 CH A L CH B R A B D 100 240 VAC 50 60 Hz CHANNEL B RIGHT INTERNAL POWER UNDERWRITERS LABS LABEL ON SIDE SEE POWER SUPPLY SERIAL NUMBER 2 LEFT CHANNEL A 1 3 4 6 5 INPUTS 7 SELECTED OUTPUT AMP2A 10S 253411 01 10 8 9 CH A L C...

Page 14: ... 2003 Wohler Technologies Inc ALL rights reserved 14 AMP2A 4S and AMP2A 10S User Manual P N 821554 Rev B Section 2 Operation ...

Page 15: ...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 Input Select Analog Switch PCB 919013 Description AMP2A 4S Interconnect Block Diagram AMP2A 10S Interconnect Block Diagram Section 3 ...

Page 16: ...re 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 ...

Page 17: ...ed scale indication Example When the gain calibration is set for 4 dBu the zero indication on the level meter will light up at 3 5 dBu Calibration is implemented in this way to effect a rounding function for more accurate indication of signal levels which occur BETWEEN the thresholds of any two bargraph segments Bargraph Display Modes DIP switch sections 3 and 4 determine how levels are displayed ...

Page 18: ...LED drive current brightness is about 10x the current taken from pin 7 Pins 6 and 4 are the top and bottom connections to the reference dividers inside the display drivers The voltage across R1 P1 R2 and DP1 is the reference against which the rectifier output applied to pin 5 is compared Refer to National Semiconductor Linear data books for a detailed discussion of the LM3915 and 3916 bargraph dis...

Page 19: ...hieved 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 mo...

Page 20: ...s at H3 channel select pins Selection from ten stereo sources is accomplished by stacking two ISS boards and jumpering their select lines together One board can select from up to ten mono or five stereo inputs Channel selection is normally done with a rotary switch mounted on the from panel of units with the ISS option installed This switch can be remoted as an option Unusual input select configur...

Page 21: ...3S Left Right L R Balanced Inputs on Phoenix Connectors Rear Panel Analog Input Impedance Phoenix 40K Ω Balanced Phoenix 3 Pin Male Connector Legend AMP2A 4S Block Diagram XLR M 3 Pin Male Rev A 01 06 03 20 Segment LED Bargraph Level Meters Left Side Speaker Phase Indication Woofer Speaker Right Side Speaker 919084 Phase Indication PCB Audio Amplifier PCB 919100 2 or 919164 Headphone Balance Volum...

Page 22: ...og Switch PCB 919013S 4 2 3 10 1 6 5 SOURCE 7 9 8 Left Right Balanced Inputs on Phoenix Connectors L R Rear Panel Left Side Speaker Phase Indication Woofer Speaker Right Side Speaker 919084 Phase Indication PCB Audio Amplifier PCB 919100 2 or 919164 R L Headphone Balance Volume Rev A 01 06 03 20 Segment LED Bargraph Level Meters Analog Input Impedance Phoenix 40K Ω Balanced Phoenix 3 Pin Male Conn...

Page 23: ... 2003 Wohler Technologies Inc ALL rights reserved 23 AMP2A 4S and AMP2A 10S User Manual P N 821554 Rev B Notes ...

Page 24: ...1055 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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