AMP1-VS and AMP1-VSA 1U Digital Audio Speaker Monitors with One SDI Input and One SDI Output on BNC, Four Analog Outputs (From SDI Input) on Phoenix, Four Analog Inputs on Phoenix (-VSA Only), Two Analog Outputs of the Left/Right Channel Selections on XLR, Summable Channel Assignment, Four 26-Segment Level Meters, and Phase Indication Document P/N 821613 Rev-B User Manual CONTENTS Title and Contents ..............................................................
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.
AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B Sect. 1: General Features and Specifications Section 1 Features, Specs, and Installation Description Features Applications Specifications Installation © 2004 Wohler Technologies Inc.
AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B Section 1: Features , Specs, and Installation AMP1-VS and AMP1-VSA Powered Digital Audio Monitors AMP1-VSA Front Panel Description The rackmountable 1U size AMP1-VS and AMP1-VSA models are audio monitors capable of audibly monitoring up to four source channels through their stereo speaker systems while simultaneously visually monitoring all four channels of the selected source via four high-resolution 26-segment LED bargraph level meters.
AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B Section 1: Features , Specs, and Installation Applications The AMP1-VS and AMP1-VSA are 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 AMP1-VS and AMP1-VSA are backed by a strong warranty and a satisfaction guaranteed return policy.
AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B Section 1: Features , Specs, and Installation Installation Mounting The unit should be mounted where convenient for operating persons, ideally at approximately ear/eye level for best high frequency response and visual observation of the level meters. Its superior magnetic shielding eliminates concerns about locating it adjacent to most types of CRT monitors, including high-resolution color monitors.
AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B Section 2 Operation Front Panel Features Rear Panel Features Audio Amplifier and Speaker Configuration Balance Control Characteristics © 2004 Wohler Technologies Inc.
AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B Section 2: Operation Front Panel Features Please refer to Figure-2a on the facing page to familiarize yourself with the front panel features of the AMP1-VS and AMP1-VSA units. The following sections describe these features and are referenced, by number, to Figure-2a. 1 Speakers The AMP1-VS and AMP1-VSA feature two mid-range speakers (left and right) and two woofer speakers.
AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B AMP1-VS Section 2: Operation AMP1-VSA Figure-2a: Front Panel Features © 2004 Wohler Technologies Inc.
AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B Section 2: Operation Front Panel Features (Continued) 8 Phase Indication LEDs These three LEDs indicate the instantaneous and average phase (polarity) conditions between the source(s) assigned to the left speaker channel and the source(s) assigned to the right speaker channel. The larger LED labeled AVG indicates the average phase condition between the left and right speaker channels.
AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B AMP1-VS Section 2: Operation AMP1-VSA Figure-2a: Front Panel Features © 2004 Wohler Technologies Inc.
AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B Section 2: Operation Rear Panel Features Please refer to Figure-2b on the facing page to familiarize yourself with the rear panel features of the AMP1-VS and AMP1-VSA 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).
AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B AMP1-VS Section 2: Operation AMP1-VSA Figure-2b: Rear Panel Features © 2004 Wohler Technologies Inc.
AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B Section 2: Operation Audio Amplifier and Speaker Configuration General Description All models in the AMP Series contain high performance transducers (speakers) driven by three power amplifiers; two amplifier/ driver combinations handle midrange and high frequency information in the left and right (stereo) speaker channels, while the third amplifier channel sums the left and right channel information below the 500 Hz crossover point in the two woofer (bass
AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B Section 3 Technical Information General Technical Observations SDI to Analog Converter Module PCB (919068) SDI D/A Gain Calibration Fine Adjustment (919068) Level Meter Rear Panel 6-Position DIP Switch Settings Level Meter Internal 10-Position DIP Switch Settings Level Meter DIP Switch Locations Level Meter Alternative Scales AMP1-VS Interconnect Block Diagram AMP1-VSA Interconnect Block Diagram © 2004 Wohler Technologies Inc.
AMP1-VS and AMP1-VSA User Manual P/N 821613, 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.
AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B Section 3: Technical Information SDI to Analog Converter Module PCB (919068 PCB) The 919068 (SDI to analog converter PCB) allows selected Wohler Technologies audio monitoring systems to be connected directly to a serial digital (SDI) video signal containing embedded audio. Two levels of component signals (eg.
AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B Section 3: Technical Information SDI D/A Gain Calibration Fine Adjustment (919068 PCB) The digital gain calibration is set at the factory for +4 dB (analog) = -20 dBFS (digital). Three other values (+8 = -20, +6 = -9, and 0 = -18) may also be user selected via a DIP switch on the rear panel (Item C, page 12).
AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B Section 3: Technical Information Level Meter Rear Panel 6-Position DIP Switch Settings Line Level (Auto) Calibration, Reference Level, and Display Mode This 6-section DIP switch sets the Line Level Calibration, Reference Level, and PPM/VU Display Mode. See below. Line Level (Auto) Calibration: The unit is calibrated at the factory. To recalibrate: 1) Turn on the power. 2) Apply the desired reference level (nominal 0) signal to all channels.
AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B Section 3: Technical Information Level Meter Internal 10-Position DIP Switch Settings This 10-position DIP switch is accessed by removing the top cover of the AMP unit and is located on the 919174 PCB (the same PCB on which the 6-position rear panel DIP switch is located). See page 21 for a diagram of the 919174 PCB and the DIP switch locations.
AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B Section 3: Technical Information Level Meter DIP Switch Locations Rear Panel Level Meter 6-Position DIP Switch Module (see page 19) 919174 PCB Internal Level Meter 10-Position DIP Switch Module (see page 20) © 2004 Wohler Technologies Inc.
AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B Section 3: Technical Information Level Meter Alternative Scales The standard scale used on the level meters (26-segment) for the AMP1-VS and AMP1-VSA units is the Extended VU scale (see diagram below).
Section 3: Technical Information AMP1-VS Interconnect Block Diagram AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B © 2004 Wohler Technologies Inc.
AMP1-VSA Interconnect Block Diagram AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B 24 © 2004 Wohler Technologies Inc.
AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B Notes: NOTE: PCB layout and schematic support documentation is available upon request. WohlerTechnologies, Technologies, Inc. Wohler Inc. 31055 Huntwood Avenue 31055 Huntwood Avenue Hayward, CA 94544 Hayward, CA 94544 Phone: (510)870-0810 589-5676 Fax: Fax: (510) (510) 870-0811 Phone: (510) 870-0811 US Toll-Free: 1-888-596-4537 US Toll-Free: 1-888-596-4537 web: www.wohler.com e-mail: support@wohler.com www.wohler.com support@wohler.
AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B Wohler Technologies, Inc. Wohler Technologies, Inc. 31055 Huntwood Avenue 31055 Huntwood Avenue Hayward, CA 94544 Hayward, CA 94544 Phone: (510) 589-5676 Phone: (510) 870-0810 Fax: (510) 870-0811 Fax: (510) 870-0811 US Toll-Free: 1-888-596-4537 US Toll-Free: 1-888-596-4537 www.wohler.com support@wohler.com web: www.wohler.com e-mail: support@wohler.com 26 © 2004 Wohler Technologies Inc.
