J. W. Davis & Company DA-120M User Manual

NEW TECHNOLOGY OLD RELIABILITY
J.W. Davis & Company •
3030 Canton Street • P.O. Box 710219 • Dallas, Texas 75371-0219
Sales 800-527-5705 • Fax 800-388-9106 • Corp 214-651-7341 • Fax 214-939-0328 • sales@jwd.com • www.jwd.com
DA-120M Master Series Amplifier
USER’S MANUAL
The Mark of the Professional...
090705122
- Unpacking/Inspection Procedures - PA Speaker Layout
- Schematic for Input Modules 1- 4
- Technical Specifications
- Circuit Board Level Settings
- Polarity
- Power Loss in Long Lines
- Back Panel Detail
- Product Description
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- Product Features
- Schematic for Input Modules 5-6
- Schematic for Chassis Board
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J. W. Davis & Company DA-120M Specifications

General

Brand	J. W. Davis & Company
Model	DA-120M
Category	Amplifier
Language	English

Summary

I - Unpacking and Inspection Procedures

Safety Warnings

General safety precautions regarding electrical shock, fire, and proper grounding.

II - Features

Key Product Features

III - Description

IV - Back Panel Detail

VI - Circuit Board Level Settings for Additional Features

Telephone VOX Muting Setup

Explains the default setting and activation of telephone VOX muting.

Microphone 1 VOX Muting Setup

System OverRide Priority Input Setup

VI - Technical Specifications

Amplifier Specifications

Lists key technical data including power rating, frequency response, S/N ratio, THD, and inputs/outputs.

XII - Considerations for PA Speaker Layout

Speaker Connection Methods

Discusses impedance matching for PA systems and two connection methods: low impedance and high impedance.

Low Impedance Wiring

High Impedance (Constant Voltage) Systems

Details the advantages and setup of 25V and 70V systems using transformers.

VIII - Polarity

Speaker Polarity Testing

XIX - Power Loss in Long Lines

Wire Gauge and Cable Length