AMP2-DA 2U Analog/Digital Stereo Monitor with Two Selectable AES/EBU Inputs (on BNC or XLR), Stereo Analog Inputs on XLR, Analog Outputs (of Digital Source) on XLR, Two 53-Segment Level Meters, and Phase Indication Document P/N 821505 Rev. B User Manual CONTENTS Title and Contents ........................................................... 1 Introduction ........................................................................................... 2 Section 1: General Features and Specifications........
Important Safety Instructions 1) Read these instructions. 2) Keep these instructions. 3) Heed all warnings. 4) Follow all instructions. 5) Do not use this apparatus near water. 6) Clean only with dry cloth. 7) Do not block any ventilation openings. Install in accordance with the manufacturer's instructions. 8) Do not install near any heat source such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
AMP2-DA Instruction and Service Manual P/N 821505 Rev-B Section 1 General Features and Specifications Description Features Applications General Specifications © 2002 Wohler Technologies Inc.
AMP2-DA Instruction and Service Manual P/N 821505 Rev-B Section 1: General Features and Specifications AMP2-DA Powered Digital/Analog Audio Monitor Unit SOURCE POWER PHASE FAST 15 12 8 6 4 2 0 2 1 AES SOURCE 6 DIGITAL 10 12 15 18 22 26 30 35 40 50 WOHLER TECHNOLOGIES AVG ANALOG AMP2-DA DIGITAL AUDIO MONITOR PANEL 1 DIGITAL SOURCE 2 2 AMP2-DA Front Panel Description The AMP2-DA is a complete, exceptionally high quality AES/Analog stereo audio monitoring system in a compact, two rackspace
Section 1: General Features and Specifications AMP2-DA Instruction and Service Manual P/N 821505 Rev-B Applications The AMP2-DA is ideally suited for use in VTR bays, mobile production vehicles, teleconferencing installations, multimedia systems, satellite links and cable TV facilities, and on-air radio studios. Designed and manufactured in the U.S., the AMP2-DA is backed by a strong warranty and a satisfaction guaranteed return policy.
AMP2-DA Instruction and Service Manual P/N 821505 Rev-B 6 Section 1: General Features and Specifications © 2002 Wohler Technologies Inc.
AMP2-DA Instruction and Service Manual P/N 821505 Rev-B Section 2 Operation Installation Front Panel Features Rear Panel Features © 2002 Wohler Technologies Inc.
AMP2-DA Instruction and Service Manual P/N 821505 Rev-B 8 © 2002 Wohler Technologies Inc.
AMP2-DA Instruction and Service Manual P/N 821505 Rev-B Section 2: Operation Installation Mounting NOTE: Be sure to set the level meter Gain Calibration and Display Mode DIP switch (accessed through the top cover) and Input Termination and Input Gain Calibration DIP switches (accessed through the rear panel), BEFORE installing the unit into an enclosed rack or console. See pages 14 and 22 for setting information.
AMP2-DA Instruction and Service Manual P/N 821505 Rev-B Section 2: Operation Front Panel Features Please refer to Figure-2a on the following page to familiarize yourself with the front panel features of the AMP2-DA unit. The following sections describe these functions and are referenced, by number, to Figure-2a. 1 Speakers The AMP2-DA internal speaker system is comprised of two mid-range tweeter speakers (left and right) and one woofer speaker (middle).
WOHLER TECHNOLOGIES 1 2 POWER 1 SOURCE 15 12 8 6 4 2 0 2 6 10 12 15 18 22 26 30 35 40 50 3 2 4 6 SOURCE ANALOG DIGITAL 5 7 FAST 8 PHASE 1 AVG 9 AES DIGITAL SOURCE 1 2 10 11 1 AMP2-DA DIGITAL AUDIO MONITOR PANEL 11 Wohler Technologies Inc.
AMP2-DA Instruction and Service Manual P/N 821505 Rev-B Section 2: Operation Front Panel Features (Continued) 10 AES Source Select Switch This two position toggle switch allows the operator to select either one of the two AES/EBU IN inputs (IN 1 or IN 2) on the rear panel (Item C, page 14) as sources for monitoring. It should be noted that in order for the unit to monitor the selected AES source, the ANALOG/DIGITAL Source Select Switch (Item 6, page 10) must be set to DIGITAL.
WOHLER TECHNOLOGIES 1 2 POWER 1 SOURCE 15 12 8 6 4 2 0 2 6 10 12 15 18 22 26 30 35 40 50 3 2 4 6 SOURCE ANALOG DIGITAL 5 7 FAST 8 PHASE 1 AVG 9 AES DIGITAL SOURCE 1 2 10 11 1 AMP2-DA DIGITAL AUDIO MONITOR PANEL 13 Wohler Technologies Inc.
AMP2-DA Instruction and Service Manual P/N 821505 Rev-B Section 2: Operation Rear Panel Features Please refer to Figure-2b on the following page to familiarize yourself with the rear panel features of the AMP2-DA unit. The following sections describe these features and are referenced, by letter, to Figure-2b. A Power Connector Attach a standard IEC-320 power cord between this connector and mains power (100 - 250VAC, 50/60 Hz).
A B ERROR TERM 1 TERM 2 X x IN 1 C C AES/EBU IN IN 1 AES/EBU IN 1 2 3 4 B 1 2 3 4 TERM 2 SERIAL NUMBER 100-240 VAC 50/60 Hz SER. NO 100-240 VAC 50/60 Hz A ERROR TERM 1 IN 2 IN 2 +4 +8 -18 -9 -20 -20 dB dBFS DIGITAL GAIN CALIB 0 +6 1 2 GAIN CALIB. D +4 +8 -18 -9 -20 -20 dB dBFS DIGITAL GAIN CALIB 0 +6 1 2 GAIN CALIB. D CH. A (L) CH. B (R) SELECTED ANALOG OUT E CH. B (R) CH. B (R) F ANALOG IN CH. A (L) CH. A (L) ANALOG IN CH.
AMP2-DA Instruction and Service Manual P/N 821505 Rev-B Section 2: Operation Rear Panel Features (Continued) E Selected Analog Output Connectors F Analog Input Connectors These two balanced (110 Ω) 3-pin male XLR connectors are analog outputs of the selected digital source as monitored by the left (Channel A) and right (Channel B) speakers and level meters. This output is not affected by the volume/balance controls or headphone mute.
A B ERROR TERM 1 TERM 2 X x IN 1 C C AES/EBU IN IN 1 AES/EBU IN 1 2 3 4 B 1 2 3 4 TERM 2 SERIAL NUMBER 100-240 VAC 50/60 Hz SER. NO 100-240 VAC 50/60 Hz A ERROR TERM 1 IN 2 IN 2 +8 -9 -20 -20 dB dBFS DIGITAL GAIN CALIB +6 -18 +4 0 1 2 GAIN CALIB. D DIGITAL GAIN CALIB +8 -20 -20 dB dBFS +6 +4 -18 -9 0 1 2 GAIN CALIB. D CH. A (L) CH. B (R) SELECTED ANALOG OUT E CH. B (R) CH. B (R) F ANALOG IN CH. A (L) CH. A (L) ANALOG IN CH.
AMP2-DA Instruction and Service Manual P/N 821505 Rev-B 18 © 2002 Wohler Technologies Inc.
AMP2-DA Instruction and Service Manual P/N 821505 Rev-B Section 3 Technical Information • General Technical Observations • AES/EBU Input D/A Converter Module Circuit Description (919117) • Level Meter, Scales, Circuit Descriptions, and Specifications • Level Meter Gain Calibration and Display Mode Settings • Level Meter Bargraph "0" (zero) Fine Adjustment • AMP2-DA Interconnect Block Diagram © 2002 Wohler Technologies Inc.
AMP2-DA Instruction and Service Manual P/N 821505 Rev-B Section 3: Technical Information General Technical Observations General Mechanical Observations Elimination of cabinet and component sympathetic vibrations (resonances) requires considerable attention to mechanical details. Because of this, and the physical constraints of the speaker’s acoustic enclosures, even minor changes to any of the mechanical details of the unit can seriously impair its acoustic performance.
AMP2-DA Instruction and Service Manual P/N 821505 Rev-B Section 3: Technical Information AES/EBU Input D/A Converter Module PCB Circuit Description (919117) There are four primary and three ancillary sections comprising the 719117 AES/EBU digital to analog converter: 1) Input source selection. 2) audio data extraction. 3) Digital to analog conversion. 4) Analog buffer / output amplifiers. 5) Power suppy, Reset, and Error indication.
AMP2-DA Instruction and Service Manual P/N 821505 Rev-B Section 3: Technical Information Level Meter Settings and Specifications Level Meter DIP Switch Settings A DIP switch module, accessed through holes in the top cover, allows the user to set the Bargraph Display Mode and Meter Input Gain Calibration. There is one DIP switch module for each pair of meter bargraphs.There are four sections (1, 2, 3, 4) on each DIP switch module.
Section 3: Technical Information AMP2-DA Instruction and Service Manual P/N 821505 Rev-B Level Meter Bargraph "0" (zero) Fine Adjustment Note: For range setting, use the Meter Input Gain Calibration/Bargraph Display Mode DIP Switches 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). The 919126 PCB is vertically mounted to chassis bottom just behind the front panel mounted LED driver PCB (see photo below).
AES In 2 Analog In B (Bal. 200K Ω ) Analog In A Analog Out B (From Selected Digital Source) Analog Out A The AMP2-DA/X features two XLR connectors (instead of BNC) for the AES inputs (Unbal. 75 Ω ) AES In 1 Rear Panel Rear Panel R L R L L Digital To Analog Converter R AES Signal/ Error LED Level Gain & Display Mode (top cover access) DIP Switch DIGITAL ANALOG D A D Analog/Digital Source Select A R L 1 2 3 4 © 2002 Wohler Technologies Inc.
MP2-DA Instruction and Service Manual P/N 821505 Rev-B You can now contact us at: WohlerWohler Technologies, Inc. 713 Grandview DriveInc. Technologies, South Francisco, CA 94080 31055San Huntwood Avenue 650 589-5676 589-1355 Hayward,Fax: CA 650 94544 web: www.wohler.com Phone: (510) 870-0810 e-mail: Fax:support@wohler.com (510) 870-0811 US Toll-Free: 1-888-596-4537 www.wohler.com support@wohler.
AMP2-DA Instruction and Service Manual P/N 821505 Rev-B Wohler Technologies, Inc. Inc. Wohler Technologies, 713 Grandview 31055 HuntwoodDrive Avenue SouthHayward, San Francisco, CA 94080 CA 94544 650 589-5676 Fax: 650 589-1355 Phone: (510) 870-0810 Fax: (510) 870-0811 web: www.wohler.com US Toll-Free: 1-888-596-4537 e-mail: support@wohler.com www.wohler.com support@wohler.com 40 © 2002 Wohler Technologies Inc.
