Wohler AMP1-DA/106 Users Manual

AMP1-DA/106

1RU Audio Speaker Monitor

User Guide

Part Number 821024, Revision B

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Last Update

June 14, 2011

821024: AMP1-DA/106 User Guide

AMP1-DA/106 User Guide

Introduction

Overview

The AMP1-DA/106 audio monitor provides self-powered, full-fidelity stereo monitoring in the smallest rack space possible. All models 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 FCC Compliance 4 Description 4 Features 5 Applications 5 Specifications 5 Other Options 7 Audio Amplifier and Speaker Configuration 8 Front Panel Controls 9 Rear Panel Connectors 11 Rear Panel 6-Position DIP Settings for the Level Meters 14 Rear Panel 10-Position DIP Settings for the Level Meters 16 Technical Functional Overview 20

821024: AMP1-DA/106 User Guide

AMP1-DA/106 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.

821024: AMP1-DA/106 User Guide

AMP1-DA/106 User Guide

Installation Recommendations

Mounting

The unit is designed to install into a standard 19" rack mounted at eye level for best visual observation of the monitor screens.

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:

To reduce noise, the monitor has no fans. As a result, 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.

Power

The 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.

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.

821024: AMP1-DA/106 User Guide

AMP1-DA/106 User Guide

FCC Compliance

This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.

Description

All AMP1-DA/106 model comes equipped with a stereo volume control, balance pot, power indication LED, and headphone output. Output limiter circuits are incorporated to protect the speakers, and extensive magnetic shielding allows placement immediately adjacent to video monitors without causing display interference.

It also features two selectable AES input sources on unbalanced BNC connectors and a stereo analog input source on two balanced XLR connectors. A toggle switch on the front panel allows selection of AES source 1 or 2 while another toggle switch selects between the selected AES digital source and the analog source inputs. A red LED indicates the presence and error status of the selected AES signal entering the unit.

Two high-resolution 106-segment tri-color LED bargraph level meters display the audio levels for the left and right selected sources. An additional pair of XLR connectors are provided on the rear panel for outputing an analog signal of the selected sources for connecting to downstream equipment.

821024: AMP1-DA/106 User Guide

Features

• 98 dB SPL at two feet

• Only one rack space high

• Thorough magnetic shielding for placement next to video monitors

• Two selectable AES/EBU inputs on unbalanced BNC connectors

• Analog stereo inputs on two balanced XLR connectors

• Analog output of selected input on two balanced XLR connectors

• AES input signal status indication LED

• AES source selection via front panel toggle switch

AMP1-DA/106 User Guide

Features

• Digital/analog source selection via front panel toggle switch

• Headphone output

• Power indication LED

• Two 106-segment high-resolution tri-color bargraph level meters:

• 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 PPM Ballistics (Type I, Type II, DIN 45406, or SSRT)

• Selectable alternate Bargraph Scales (AES, Extended VU,

Alternative AES, VU, BBC, NORDIC, and DIN)

Applications

The AMP1-DA/106 is ideally suited for use in VTR bays, mobile production vehicles, teleconferencing installations, multimedia

821024: AMP1-DA/106 User Guide

AMP1-DA/106 User Guide

Specifications

systems, satellite links and cable TV facilities, and on-air radio studios. Designed and manufactured in the U.S., the AMP1-DA/106 is backed by a strong warranty and a satisfaction guaranteed return policy.

Specifications

Table 1–1 Specifications for the AMP1-DA/106

Specification Value

Inputs

Input Impedance

Input Level for Maximum Output (Volume Full On)

Input Overload +26 dBv balanced Peak Acoustic Output (@ 2

ft.)

Response, Sixth Octave

Power Output

2 XLR (Male)

2 BNC (Female) XLR (Analog): 40K Ω balanced

BNC (Digital): 75 Ω unbalanced

0 dBv balanced

98 dB SPL

80 Hz - 16 kHz ± 7 dB (-10 dB @ 50 Hz, 22 kHZ)

RMS Each Side (4Ω)

RMS Bass (4Ω)

Distortion, Electrical:

Distortion, Acoustic

Hum and Noise better than -68 dB below full output Magnetic Shielding Less than 1 Gauss any adjacent surface Power Consumption

(Average Maximum): AC Mains Input: 100-240VAC, 50-60 Hz

Dimension (h x w x d)

Weight 14 lbs. (6.4 kg)

821024: AMP1-DA/106 User Guide

10  transient / 5  continuous

20  transient / 10  continuous Less than 0.15% at any level below

limit threshold 8% or less at worst case frequencies

above 180 Hz including cabinet resonance; typically less than 2%

35 W

1.75 x 19 x 12 inches (44.5x 483 x 298 mm)

+ 16 hidden pages