Wohler AMP1A Series User Manual Download Page 1

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World Leader of In-Rack, Audio, Video, Data Monitoring, and Closed Captioning Solutions

CONFIDENCE IS EVERYTHING.™

AMP1A Series

• AMP1A-30

• AMP1A-106

• AMP1A-Plus

• AMP1A-LP10S

1 RU, Analog Audio Monitors with Level

Meters

User Guide

Part Number 821020, Revision B

Summary of Contents for AMP1A Series

Page 1: ...Audio Video Data Monitoring and Closed Captioning Solutions CONFIDENCE IS EVERYTHING AMP1A Series AMP1A 30 AMP1A 106 AMP1A Plus AMP1A LP10S 1 RU Analog Audio Monitors with Level Meters User Guide Part Number 821020 Revision B ...

Page 2: ...wed the documentation Wohler Technologies Inc makes no warranty or representation either express or implied with respect to software documentation their quality performance merchantability or fitness for a particular purpose Wohler Technologies Inc reserves the right to change or improve our products at any time and without notice In no event will Wohler Technologies Inc be liable for direct indir...

Page 3: ...d full fidelity stereo monitoring in the smallest rack space possible Topics Topics Page Introduction 1 Safety Instructions 2 Installation Recommendations 3 Description 4 Application 4 Features 5 Specifications 5 Audio Amplifier and Speaker Configuration 7 Optional Features 8 Front Panel Controls 9 Rear Panel Connectors 13 Internal Switch Settings 17 Technical Functional Overview 22 ...

Page 4: ...l width 8 Protect the power cord from being walked on or pinched particularly at plug s source on the equipment and at the socket 9 Use only the attachments accessories specified by the manufacturer 10 Unplug the equipment during lightning storms or when unused for long periods of time 11 Refer all servicing to qualified service personnel Servicing will be required under all of the following condi...

Page 5: ...nt devices can be rack mounted or stacked in proximity to the unit if the above temperature is not exceeded Allow a 1RU 1 75 44 45mm space above and below the unit for air circulation Rack Mounting You should install the monitor into a standard 19 rack and requires a maximum of 3RU of rack space the 2RU unit plus 1RU above and below Also install it as close to the operator s direct viewing angle a...

Page 6: ...lifier driver combinations handle midrange and high frequency information in stereo while the third center channel reproduces information below the 500 Hz crossover point through dual woofers All AMP 1A analog audio models come equipped with stereo volume and balance potentiometers a power indication LED and a headphone output Output limiter circuits are incorporated to protect the speakers and ex...

Page 7: ...power Specifications The AMP1A Series monitors meet the following specifications Table 1 1 AMP1A Series Monitors Specifications Specification AMP1A 30 AMP1A 106 AMP1A LP10S AMP1A Plus Inputs 2 Balanced Analog Audio on XLR Left Right 2 Banks of 10 Phoenix Left Right 4 Balanced Analog Audio on XLR Left Right 2 Unbalanced RCA Outputs 2 Analog Audio on XLR Left Right Input Impedance 40k balanced Input...

Page 8: ... Average Maximum 35 W AC Mains Input 100 to 240 V AC 50 to 60 Hz Dimensions 1 75 H x 19 W x 10 D 44 5 mm H x 483 mm W x 254 mm D Weight 8lbs 3 6kg Table 1 1 AMP1A Series Monitors Specifications Specification AMP1A 30 AMP1A 106 AMP1A LP10S AMP1A Plus Table 1 2 Level Meters Specifications Specification AMP1A 30 AMP1A 106 AMP1A LP10S Level Calibration 6 0 4 8 dBv Frequency Response 20 Hz to 18 kHz 0 ...

Page 9: ...nformation below the 500 Hz crossover point in the woofer bass speaker s Note that the woofer channel is not a dedicated LFE or center channel Speaker Configuration The 1U rack size AMP1 Series products are configured with two speakers left and right to reproduce mid and high range audio frequencies in stereo but feature two woofer speakers to reproduce the summed combined low range audio frequenc...

Page 10: ... production audio monitors Standard production AMP1A Series monitors or special orders can include the following functions and combinations thereof Separate channel volume controls SVC Option Alternate level meter scales and color maps Bar graph display phase correlation F Option Multiple input and output connector type choices For other custom orders contact your Wohler Sales representative Wohle...

Page 11: ...ever when you plug in headphones the internal speakers will mute This jack accepts a standard 1 4 phone type stereo plug Power LED This LED glows green to indicate the monitor is connected to operational mains power Audio Level Meters Audio levels are visually displayed via thigh resolution tri color red amber green LED bar graph display level meters The upper level meter monitors Channel A left w...

Page 12: ... and a voice speaking Spanish is fed to the B right input then the left speaker channel will reproduce the mid range and high range frequencies of the English speaking voice the right speaker channel will reproduce the mid range and high range frequencies of the Spanish speaking voice and the woofer speaker channel will reproduce the summed combined low range frequencies of both voices If the bala...

Page 13: ... increase the relative brightness of the bar graph LED segments Adjusting this one control will simultaneously affect the brightness of both bar graph displays AMP1A LP10S Specific Front Panel Controls Figure 1 4 AMP1A LP10S Front Panel Level Meters The AMP1A LP10S features two 10 segment bar graph audio meters Source Select 10 Position Rotary Switch This switch selects from the multi channel inpu...

Page 14: ...D glows or blinks green for in phase signals The lower Φ LED glows or blinks amber for out of phase signals The large center AVG LED indicates the average phase condition by glowing green for in phase signals or red for out of phase signals In general observing the average LED alone is sufficient for proper phase monitoring While it is normal for stereo signals to contain some intermittent instant...

Page 15: ... Audio Input on XLR F These two 3 pin female XLR connectors left and right accept standard analog audio signals and are configured for 50K Ω balanced connections Pinout information for the XLR connectors is shown at bottom of this page Figure 1 6 XLR F Pin Out Selected or Loop Through Analog Audio Output XLR M These two 3 pin male XLR connectors output balanced low impedance analog signals Pinout ...

Page 16: ... Calibration Mode Select Analog Audio In Left Right Power Analog Audio Loop Through Left Right Table 1 3 Operation Calibration Mode Select Switch Settings Switch Numbersa Function Description 1 Operation Calibration Determines whether the monitor is in a normal operational mode or a calibration cycle 2 and 3 Reference Level Adjusts the level of the input signal and the resultant level displayed on...

Page 17: ...l four channels is within 4 dB of the reference level set in DIP switches 2 and 3 4 Place DIP Switch 1 in the down position calibration 5 Wait 10 seconds for the unit to update its calibration to your settings 6 Place DIP Switch 1 in the up position operation and return unit to service Note Switch position 6 is not used Note You can only auto calibrate the monitor once for each power cycle Once yo...

Page 18: ...nformation is silk screened on the rear panel between the two rows of connectors Figure 1 10 AMP1A LP10S Rear Panel AMP1A Plus Specific Rear Panel Connectors The AMP1A Plus provides two analog audio inputs Channel A left and Channel B right Figure 1 11 AMP1A Plus Rear Panel Power Selected Analog Out Left Right Analog Audio Inputs Left Right 2 3 1 1 3 2 CH B R XLR LOOP THRU CH A L SOURCE 1 CH B R S...

Page 19: ...l level meter settings and or calibration settings AMP1A 30 and AMP1 106 Internal Switch Settings This 10 position DIP module is located on the 919174 PCB Refer to Figure 1 12 below for a complete list of settings and functions Switch positions 1 and 10 are not used and should be left at the factory set position Figure 1 12 0 Position DIP Switch Settings Figure 1 13 on page 18 illustrates the DIP ...

Page 21: ...etting the Alternate Scale DIP switches Figure 1 12 on page 17 it is recommended that a label with the appropriate scale be applied to the front panel LED bar graph level meters Alternate scales include the VU BBC Nordic and DIN scales The Extended VU scale is the standard scale for all AMP1A Series models See Figure 1 14 below for 30 segment alternate scales Contact Wohler Technologies for more i...

Page 22: ...teristics available for selection using DIP switch sections 7 and 8 of the 10 position Internal DIP Switch Figure 1 12 on page 17 are listed in Table 1 4 below Phase Correlation Display Since it is sometimes helpful to observe phase relationships between two signals being monitored you can enable the phase correlation feature within the lower section of the existing bar graph pair in the AMP1A 30 ...

Page 23: ...eo pair One additional segment above the active correlation region is always off to serve as a marker The correlation display is visible only so long as the VU audio level is above this blank segment fourteenth segment up on the 30 segment bar graph AMP1A Plus and AMP1A LP10S Internal Switch Settings Level Meter DIP Switch Settings Two DIP switch modules accessed through an opening in the top cove...

Page 24: ...ng is 4 dBv but can instead be set for 6 dBv 0 dBv or 8 dBv by the user Bar Graph 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 r...

Page 25: ...echnical Functional Overview Figure 1 19 AMP1A 30 Block Diagram Left Speaker Stereo Analog Amplifier Volume Balance Woofer Speaker Phase Indication Right Speaker Headphone Woofer Speaker Right Left Left Analog Input A Loop Thru Loop Thru Right Analog Input B Right Left 30 Segment High Visibility Level Meters ...

Page 26: ...chnical Functional Overview Figure 1 20 AMP1A 106 Block Diagram Headphone Left Speaker Stereo Analog Amplifier Volume Balance Woofer Speaker Phase Indication Right Speaker Woofer Speaker Right Left Left Analog Input A Loop Thru Loop Thru Right Analog Input B Right Left 106 Segment High Resolution Level Meters ...

Page 27: ...iew Figure 1 21 AMP1A LP10S Block Diagram 10 Segment Level Meters Left Speaker Stereo Analog Amplifier Volume Balance Woofer Speaker Phase Indication Right Speaker Headphone Woofer Speaker Right Left R L Stereo Output of Selected Source 9 10 3 6 8 7 Analog Inputs 5 4 2 1 Source Pair Select Right Input Left Input 6 5 7 9 3 2 1 10 4 8 ...

Page 28: ... User Guide Technical Functional Overview Figure 1 22 AMP1A Plus Block Diagram Left Speaker Stereo Analog Amplifier Volume Balance Woofer Speaker Right Speaker Headphone Woofer Speaker Right Input Chan B Chan A 2 1 Left Input Right Left 1 2 1 2 2 1 R L Selected Source Output Select Stereo Source ...

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