Wohler AMP1A-LP10S User Manual Download

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AMP1A-4S/-10S/-LP4S/-LP10S

User Manual P/N

821527

Rev-

Section 3: Technical Information

AMP1A-4S and

AMP1A-LP4S Interconnect Block Diagram

AMP1A-4S and AMP1A-LP4S Block Diagram

CH. B (R)

Selected

Output

(XLRM)

CH. A (L)

Channel

A (Left)

Stereo Source

Select Switch

(Front Panel)

Channel

B (Right)

Rear

Panel

Input Select Switch (ISS)

Analog Switch PCB

919013S

Left

Right

Balanced Inputs on

Phoenix Connectors

Note:

These features on -LP model only.

Level

Meters

Phase

Indication

Right

Bargraph

Driver PCB

919017R

Left

Bargraph

Driver PCB

919017L

Phase

Indication

PCB

919084

Audio Amplifier PCB

919100 o

919164

Headphone

Balance

Volume

Left

Side

Speaker

Left

Woofer

Speaker

Right

Side

Speaker

Right

Woofer

Speaker

Rear

Panel

Summary of Contents for AMP1A-LP10S

Page 1: ...ibrationandDisplayModeSettings BargraphDriverCircuitDescription 919017 LevelMeterSpecifications Multi ChannelAnalogSwitchingPCBCircuitDescription 919013 InterconnectBlockDiagrams AMP1A Series AMP1A 4S AMP1A 10S AMP1A LP4S AMP1A LP10S 1U Multi Channel Audio Speaker Monitors with Four or Ten Analog Audio Inputs Stereo Analog Outputs and Optional Dual 10 Segment Level Meters and Phase Indication Docu...

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: ...hler Technologies Inc ALL rights reserved AMP1A 4S 10S LP4S LP10S User Manual P N 821527 Rev B General Features and Specifications Description Features Applications GeneralSpecifications Other Options Section 1 ...

Page 4: ... adjacent to video monitors with no color impurities The AMP1A 4S model features four pairs 8 channels of balanced inputs on Phoenix connectors and the AMP1A 10S features ten pairs 20 channels of these inputs Any pair of inputs is selectable for monitoring via a rotary source select switch on the front panel An additional pair of XLR connectors output the selected audio signals for connecting to d...

Page 5: ...ny adjacent surface Balanced XLR 35 W 100 240VAC 50 60Hz Level Calibration Frequency Response Level Meter Type LED Color Metering Range Display Modes VU Characteristics Rise Time Decay Time PPM Characteristics Attack Time Decay Time Dimension h x w x d Weight 6 0 4 8 dBv 20 Hz to 18 kHz 0 5 dB 10 segment tri color LED bargraph display Tricolor red amber green 23 dB VU or PPM Selectable 300 ms to 9...

Page 6: ...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 evenly aroun...

Page 8: ...om the multi channel inputs a single stereo audio source 2 channels for monitoring through the unit The 4S models use a 4 position rotary switch for source selection while the 10S models use a 10 position rotary switch for this function 7 Audio Level Meters 10 Segment LED Bargraph Displays AMP1A LP4S and AMP1A LP10S Only Audio levels are visually displayed via these two 10 segment tri color red am...

Page 9: ... 1 3 2 3 4 1 SOURCE MONITOR PANEL ANALOG AUDIO AMP1A LP4S 1 2 3 1 2 3 7 4 8 7 4 8 7 5 7 6 5 6 1 3 2 4 2 3 1 4 5 6 5 SOURCE WOHLER TECHNOLOGIES SOURCE POWER 1 AVG 3 5 7 10 20 2 1 3 1 0 3 10 7 5 2 20 3 1 2 1 0 1 10 SOURCE 5 4 3 2 7 8 9 6 AMP1A LP10S ANALOG AUDIO MONITOR PANEL WOHLER TECHNOLOGIES POWER 4 1 SOURCE MONITOR PANEL 2 3 AMP1A 4S ANALOG AUDIO 6 WOHLER TECHNOLOGIES POWER 9 2 10 1 SOURCE 7 6 ...

Page 10: ...comprised of four connectors each for a total of eight inputs four stereo pairs Connector pinout information is silk screened on the rear panel above each connector C Balanced Inputs Channels 1 10 3 Pin Male Phoenix AMA1A 10S and ANAP1A LP10S Only These balanced 90K Ω 3 pin Phoenix connectors left and right accept standard analog audio signals The two banks of inputs Channel A Left and Channel B R...

Page 11: ...1A LP4S Rear Panel A B D A C D INTERNAL POWER UNDERWRITERS LABS LABEL ON SIDE SEE POWER SUPPLY 4 3 2 1 CHANNEL A LEFT 100 240 VAC 50 60 Hz INPUTS SEL OUT CH B R SEL OUT CH A L 4 3 2 1 RIGHT CHANNEL B AMP1A LP4S 253829 INPUTS INTERNAL POWER UNDERWRITERS LABS LABEL ON SIDE SEE POWER SUPPLY CHANNEL B RIGHT CHANNEL A 100 240 VAC 50 60 Hz LEFT 1 2 4 3 5 SEL OUT CH B R SEL OUT CH A L AMP1A LP10S 253828 ...

Page 13: ...27 Rev B Technical Information General Technical Observations Level Meter Gain Calibration and Display Mode Settings 919017 Level Meter Bargraph Driver Circuit Description Level Meter Specifications 919013 Multi Channel Analog Switching PCB Circuit Description Interconnect Block Diagrams Section 3 ...

Page 14: ...nput 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 fr...

Page 15: ...for 6 dBv 0 dBv or 8 dBv by the user See the diagram below for settings Bargraph Display Modes DIP switch sections S3 and S4 determine how peak levels are displayed Display Mode and select either the PPM mode or an auto reset VU Peak mode NOT the PPM value The PPM mode exhibits an attack time of 10 milliseconds and a decay time of 2 seconds from 0 to 20 dB The VU mode exhibits a 300 millisecond ri...

Page 16: ...the current taken from pin 7 The top of the internal comparator resistor ladder is connected to pin 6 the bottom to pin 4 The voltage across R23 R24 and P1 is the reference against which the rectifier output applied to pin 5 is compared The meter is calibrated by adjusting P1 PPM or P2 VU ZD1 sets the voltage at the bottom of the resistor ladder and the bias for the rectifier circuit with C11 as a...

Page 17: ...s 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 configurations L only R only phase...

Page 18: ...elect Switch Front Panel 3 4 1 2 4 3 2 1 Channel B Right 3 4 2 1 Rear Panel Input Select Switch ISS Analog Switch PCB 919013S Left Right L R Balanced Inputs on Phoenix Connectors Note These features on LP model only 2 Level Meters Phase Indication Right Bargraph Driver PCB 919017R Left Bargraph Driver PCB 919017L Phase Indication PCB 919084 Audio Amplifier PCB 919100 or 919164 Headphone Balance Vo...

Page 19: ... B Right Inputs 6 7 8 5 4 2 1 2 1 6 10 9 7 8 4 5 3 Input Select Switch ISS Analog Switch PCB 919013S 4 2 3 10 1 6 5 SOURCE 7 9 8 Left Right Balanced Inputs on Phoenix Connectors AMP1A 10S and AMP1A LP10S Block Diagram L R Note These features on LP model only Level Meters Phase Indication Right Bargraph Driver PCB 919017R Left Bargraph Driver PCB 919017L Phase Indication PCB 919084 Audio Amplifier ...

Page 20: ...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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