Wohler AMP1A-VTR2, AMP2-VSDA, AMP1-V2DA User Manual

CONFIDENCE IS EVERYTHING.™

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

AMP V Series

• AMP1A-VTR2 • AMP2-VSDA

•AMP1-V2DA

Digital/Analog Audio Speaker Monitors

User Guide

Part Number 821021, Revision A

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Last Update

January 12, 2010

AMP V Series User Guide

Introduction

Overview

The AMP V Series monitors are audio monitors capable of audibly monitoring up to four analog source channels through an internal stereo speaker system while simultaneously visually monitoring all four channels of the selected source via four high-resolution LED bar graph level meters.

Topics

Topics Page

Introduction 1 Safety Instructions 2 Installation Recommendations 3 Description 4 Features 5 Specifications 6 Audio Amplifier and Speaker Configuration 7 Front Panel Controls 8 Rear Panel Connectors 13 Line Level Calibration Instructions 17 Internal Switch Settings 20 Technical Functional Overview 24

AMP V Series User Guide

Safety Instructions

1. Read, keep, and follow all of these instructions; heed all warnings.

2. Do not use this equipment near water.

3. Use only a dry cloth to clean the equipment.

4. Do not block any ventilation openings. Install only in accordance

with the instructions in the section entitled, “Installation

Recommendations” on page 3.

5. Do not install near any heat source such as a radiator, heat register,

amplifier, or stove.

6. Do not expose the equipment to rain or moisture.

7. Do not attempt to plug the unit into a two-blade outlet (with only

two prongs of equal width).

IMPORTANT:

By design, these monitors will only plug into a three-prong outlet for your safety. If the plug does not fit into your outlet, contact an electrician to replace the obsolete outlet.

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 conditions:

• The equipment has been damaged in any way, such as when

the power-supply cord or plug is damaged.

• Liquid had been spilled or objects have fallen onto the

equipment.

• The equipment has been exposed to rain or moisture.

• The equipment does not operate normally.

• The equipment has been dropped.

AMP V Series User Guide

Installation Recommendations

Unpacking

Unpack the AMP V Series monitor from the shipping container and inspect all components for shipping damage. If you find any damage, notify the shipping carrier for claims adjustments.

Compare the shipping box contents to the packing slip. Contact Wohler’s customer support personnel about any discrepancies. (Wohler’s contact information in on the copyright page ii, of this manual).

Heat Dissipation

The ambient temperature inside the mounting enclosure should not exceed 40° Celsius (104° Fahrenheit). Adjacent 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.

Important:

The heat generated by the power amplifiers, power supplies, and other components is vented by slots in the side of the unit. Therefore, as a safety precaution, we advise you to be sure to allow proper ventilation on both sides of the unit.

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 as possible as LCD screens can appear to display anomalies outside this viewing angle.

Cable Connections

Wohler recommends Beldon 8281 or Belden 1694A cables for analog video signals and Beldon 9451 cables for analog audio signals.

AMP V Series User Guide

Description

Power

Each unit comes with a standard 24VDC/3.0A internal power supply and connects an A/C mains power source (65W, 100 to 240 VAC, 50/ 60Hz) to the IEC connector provided on the rear panel of the unit.

Electrostatic Discharge (ESD)

As with most electronic equipment, static discharges can damage components within the unit. Take precautions to ensure your installation environment is not subject to ESD.

Description

In addition to the four high-resolution LED bar graph level meters, the AMP V Series monitors also provide two banks of four buttons on the front panel which are used to independently assign from one to four (summed) channels to each of the two (left and right) speaker channels. Features for these two models include a stereo volume control and balance control, power indication LED, headphone output, and a stereo analog output on two balanced XLR connectors of the channels assigned to the left and right speaker channels. Output limiter circuits are incorporated to protect the speakers, and extensive magnetic shielding allows placement immediately adjacent to video monitors with no color impurities. Wohler Technologies proprietary three-LED stereo phase indication feature allows monitoring of phase relationships of the selected channels assigned to the left and right speaker channels. The four LED bar graph level meters offer selectable Input Reference Level, Display Mode, Peak Hold, Ballistics. Phase Correlation and alternate scales are available as options.

Features

• 98 dB SPL at two feet

• Excellent high frequency response for positive detection of

• Audible and visual indication of phase/polarity problems

• Thorough magnetic shielding for placement next to video monitors

• Four high-resolution tri-color bargraph level meters:

AMP V Series User Guide

Features

background whine and noise

• Selectable input reference level (0, +4, +6, or +8 dBu)

• Selectable display mode (VU Only, VU/PPM, or PPM Only)

• Selectable peak hold (Manual, 3-Second, 10-Second, or Off)

• Selectable ballistics (Type I, Type II, DIN 45406, or SSRT)

• Selectable alternate bar graph scales (Extended VU is

standard) Alternative AES, VU, BBC, NORDIC, and DIN scale labels are available as an option.

• Selectable phase correlation (labels available as option F).

• Two banks of four push buttons for assigning single or summed

channels to the left and right speakers

• Digital/analog source selection via front panel toggle switch

• Headphone output

• Power indication LED

AMP V Series User Guide

Specifications

Table 1–1 lists the specifications for the AMP V Series monitors.

Table 1–1 AMP V Series Monitors Specifications

Specifications AMP1-V2DA AMP1-VTR2 AMP2-VSDA

Level Meter Type

Segment Size .158” x .04” (4.0132 mm x 1.016 mm) Peak Hold (selectable) Manual, 3 sec, 10 sec, or off Dynamic Range 62 dB 65 dB Scale +12 to -50 db + 16 to -50 dB Bar Graph Scales VU, Ext, VU, BBC, Nordic, or Din Midscale Resolution 1 dB

Input Connectors

Analog Input Impedance Phoenix: 200k  balanced Phoenix: 90k  balanced XLR: 70k  balanced

Digital Input Impedance BNC: 75  unbalanced —

Input Level for Maximum Output (Volume Full On)

Peak Acoustic Ouptut (@ 2 ft.)

Frequency Response, Sixth Octave

4 Analog (Phoenix)

2 AES (BNC)

26-Segment 53-Segment

Tri-Color (red, amber, green) LED Bar Graph

8 Analog (Phoenix)

0 dBv balanced; -10 dB unbalanced

98 dB SPL 104 dB SPL

80 Hz to 16 kHz ± 7 dB

(-10 dB @ 50 Hz, 22kHz)

2 AES (XLR/BNC)

BNC: 75  unbalanced

XLR: 110  balanced

80 Hz to 16 kHz ± 5 dB

(-10 dB @ 40 Hz, 20kHz)

4 Analog (XLR)

1 SDI (BNC)

Power Output

RMS Each Side (4)

RMS Bass (4)

Distortion, Electrical < 0.15% at any level below input threshold

Distortion, Acoustic

Hum and Noise Better than -68 dB below full output

Magnetic Shielding < 1 Gauss any adjacent surface

Power Consumption 35W 45 W AC Mains Input 100 to 240 V AC, 50 to 60 Hz Universal Weight 10 lbs. (4.53 kg) 18 lbs. (8.2 kg)

Dimenstions (H x W x D) 1.7” Hx 19” W x 12” D (43 mm x 483 mm x 305 mm)

8% or less at worst case frequencies aove 180 Hz

including cabinet resonance; typically less than 2%

10 W transient/5 W continuous

20 W transient/10 W continuous

14 W transient/

10 W continuous

35 W transient/

25 W continuous

6% or less at worst case

frequencies aove 180 Hz

including cabinet

resonance; typically less

than 1.5%

< 0.8 Guass any adjacent

surface

3.5” H x 19” W x 12” D

(89mm x 483mm x 305mm)

AMP V Series User Guide

Audio Amplifier and Speaker Configuration

Audio Amplifiers

All AMP V Series models contain high performance 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 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 frequencies from the left and right speaker input channels. It should be noted that both woofer speakers, which are wired in series, are driven from one woofer speaker channel, and are not stereo. See the simplified diagram below for a block diagram of the AMP1 Series audio amplifier/speaker configuration. The 2RU AMP2 is similar, except the side speakers are larger and has only one woofer.

Figure 1–1 Audio Amplifier and Speaker

Configuration

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Wohler AMP1A-VTR2, AMP2-VSDA, AMP1-V2DA User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual