Wohler AMP1-SDA, AMP2-SDA User Manual

CONFIDENCE IS EVERYTHING.™

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

AMPx SDA Series

•AMP1-SDA •AMP2-SDA

Digital Audio Speaker Monitors

User Guide

Part Number 821027, Revision C

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Last Update

March 23, 2010

AMPx-SDA User Guide

Introduction

Overview

The AMPx-SDA Series of audio monitors provides self-powered, fullfidelity stereo monitoring in the smallest rack space possible. All models in the series contain four high performance transducers driven by three power amplifiers: two amplifier/driver combinations handle midrange and high frequency information in stereo, while the third center channel reproduces information below the 500 Hz crossover point.

Topics

Topics Page

Introduction 1 Safety Instructions 2 Installation Recommendations 3 Features 4 Applications 5 Specifications 6 Front Panel Controls 8 Rear Panel Connectors 11 Technical Functional Overview 16

AMPx-SDA User Guide

Safety Instructions

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

2. Do not use this equipment near water or moisture.

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 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.

7. Protect the power cord from being walked on or pinched,

particularly at plug’s source on the equipment and at the socket.

8. Use only the attachments/accessories specified by the

manufacturer.

9. Unplug the equipment during lightning storms or when unused

for long periods of time.

10. 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.

AMPx-SDA User Guide

Installation Recommendations

Mounting

Note:

The unit should be mounted where convenient for operating persons, ideally at approximately ear level for best high frequency response. Its superior magnetic shielding eliminates concerns about locating it adjacent to most types of CRT monitors, including even high-resolution color monitors.

Heat Dissipation

Heat dissipated by the speaker amps is conducted directly to the left side of the chassis; no special considerations for cooling are necessary as long as the ambient temperature inside the rack area does not exceed approximately 40°C (104°F).

If you wish to set the AES Input Termination, AES Status Error Type, AES Input Level Gain, Line Level Calibration, Meter Gain

Calibration, and/or Bargraph Display Mode via the DIP switches (accessed on the rear panel) be sure to do so BEFORE installing the unit into an enclosed rack or console. See pages 12 and 14 for setting information.

Sympathetic Vibration

Sympathetic vibration from other equipment (cables, etc.,) in the rack may be serious enough to interfere with the unit’s sound quality out in the listening area. The use of thin card stock and/or felt or foam weather-stripping type materials between adjacent vibrating surfaces, or tying up loose cables, etc., may be required 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 around the unit.

AMPx-SDA User Guide

Features

Audio Connections

Connection of the audio feeds is straightforward. For digital inputs, Impedances are 75 Ω for the unbalanced BNC connectors and 110 Ω for the balanced XLR connectors. Analog inputs have an impedance of 40k Ω for the balanced XLR connectors. Care should be exercised to avoid mismatched cable types and other similar causes of undesired reflections in RF signal systems.

Electrical Interference

As with any audio equipment, maximum immunity from electrical interference requires the use of shielded cable; however, satisfactory results can sometimes be obtained without it. The internal circuitry common is connected to the chassis.

AC Power

The unit's AC mains connection is via a standard IEC inlet, with safety ground connected directly to the unit's chassis. The universal AC input (100-240VAC, 50/60Hz) switching power supply is a self-resetting sealed type, with automatic over-voltage and over-current shutdown. There is no user-replaceable fuse in either the primary or secondary circuit.

Features

• 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

background whine and noise

• Two high-resolution 26-segment tri-color LED bar graph level

meters

• SDI input and loop-through on unbalanced BNC connectors

+ 12 hidden pages

Wohler AMP1-SDA, AMP2-SDA User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual