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headway EDB-2 User Manual

headway EDB-2
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Sheer Acoustic Equaliser Direct Blend: EDB-2
Multi-function Pre-amplifier with EQ, Blend & Direct Injection
functions for superior Acoustic Amplification.
Designed in UK
INSTRUCTION MANUAL
EDB-2 provides a beautifully voiced and practical solution to the
diverse and critical needs for high quality acoustic musical instrument
amplification.
Suitable for stage and other signal processing.
EDB-2 offers an increased range of gain to interface better with
Mixers, luxurious amounts of EQ and other highly versatile facilities to
get the best possible sound from amplified acoustic stringed
instruments.
Now offering reduced noise levels!
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headway EDB-2 Specifications

General IconGeneral
Brandheadway
ModelEDB-2
CategoryAmplifier
LanguageEnglish

Summary

EDB-2 Product Overview

Sheer Acoustic Equaliser Direct Blend: EDB-2

Multi-function pre-amplifier with EQ, Blend & Direct Injection for acoustic amplification.

Key Features and Benefits

Highlights practical solutions, increased gain, extensive EQ, and versatile facilities for optimal sound.

Design Origin and Application

Product designed in the UK and suitable for stage and signal processing.

EDB-2 Key Features

Premium Components & Sound Quality

Features Class "A" inputs and Pro Audio ICs for warmth, clarity, and low noise.

Advanced EQ & Signal Processing

Includes 5-band EQ, tuneable notch filter, and versatile input impedance switching.

Connectivity & Power Options

Offers versatile inputs, signal splitting, dual mixing, and phantom power.

Instrument Tone Shaping

Includes a range switch for Guitar, Bass, and Violin for tone shaping.

Additional EDB-2 Features and Product Information

Connectivity and Power Features

Details Aux IN, mounting options, extended headroom, and power supply flexibility.

Construction and Build Quality

Highlights sturdy steel housing and quality components for durability.

Important Usage Advisory

Recommends reading the manual carefully before switching on or plugging in the EDB-2.

EDB-2 Top Panel Controls and Indicators

Power Controls and Status Indicators

Explains Power On/Off/Standby, Green LED, and Low Battery LED functions.

Equaliser and Filter Controls

Details the 5 Band EQ, Notch Filter, and Q Width controls.

Input and Output Management

Covers Input Gain, Input Impedance, Phase, XLR Switch/Mic In, and Range Filter.

Master Output and Muting

Describes the Master control for output level and the Mute function.

EDB-2 Panel Layout and Connectivity

Right Hand Side Panel Connections

Details Aux In/iPod Input and Line Out connections on the side panel.

Front Panel Inputs and Options

Covers CH.1 Jack In, Phantom Power, CH.2 Mono Jack In, CH.2 Mic/XLR In, and accessory options.

Rear Panel Connections and Battery Access

Explains DI/XLR Line Out, Ext. Power In, and Battery Panel access.

Safety Precautions and Operation Guidelines

Important Safeguards and Warnings

Essential safeguards for life and gear, including reading all warnings carefully.

Earth Protection and Grounding

Guidance on preventing electric shock via continuous mains earth connection.

Mains Protection Measures

Recommendations for using RCDs, surge protectors, and noise filters.

Operational Safety and Noise Minimization

Shock and Damage Prevention

Warnings against exposure to liquids, electrical hazards, and improper handling.

Venue and Microphone Safety

Advice on venue selection and using government-approved radio mics.

Placement and Usage Precautions

Guidelines for cable placement, general handling, and switching off when not in use.

Minimizing Plug-in and Switch-on Noise

Techniques to reduce noise during connection and power-up sequences.

Servicing, Repairs, Returns, and Cleaning

Servicing, Repair, and Return Procedures

Outlines procedures for servicing, repairs, and product returns, including documentation.

User Serviceability and Disassembly Warning

Warns against disassembling the unit as it contains no user-serviceable parts.

Cleaning Instructions

Provides guidance on cleaning the EDB-2 using a dry cloth and avoiding liquids.

Product Liability and Warranty Information

Product Liability and Limitations

Details Headway Music Audio Ltd.'s responsibility for product damage, loss, and injury.

Warranty and Guarantee Terms

Specifies the EDB-2 guarantee validity, registration, and terms.

Guarantee Details and Product Handling

Guarantee Coverage and Exclusions

Defines what is covered and not covered by the Headway Music Audio Ltd. guarantee.

Guarantee Registration Importance

Emphasizes registering the guarantee within 30 days for coverage.

Storage and Transport Advice

Provides recommendations for storing and transporting the EDB-2 safely.

Channel 1 Input Specifications and Setup

International Shipping Note

Prohibits shipping batteries internationally via standard transit methods.

Power On and Standby Operation

Explains the quieter switching method for powering on and standby.

+HI IMP Ultra High Impedance Input

Details the < 20 Meg Ohms input optimized for ultra high impedance passive, non-powered pickups.

HI IMP High Impedance Input

Describes the < 5 Meg Ohms input optimized for passive under-saddle Ceramic Piezo pickups.

Channel 1 Input Types and Gain Control

ACTIVE/LOW Impedance Input

Details the < 50k Ohm input for active pickup systems and line level signals.

Stereo Jack Input Functionality

Explains how stereo jack inputs feed separate signals to both channels.

Auxiliary Input for iPod Connection

Describes the Mini-Jack socket for iPod connection, bypassing gain and EQ.

Gain Control Operation

Explains the Gain knob operation (0-10, 0-32dB) and joint operation with Master.

Interactive 5 Band EQ Section

EQ Section Application

Details how the 3-way switch applies EQ to channels or both.

EQ Control Interaction and Usage

Discusses the interaction between EQ bands and provides examples for thinning mid-range.

Typical Instrument EQ Requirements

Offers guidance on EQ needs for various instruments like acoustic guitars, violins, and mandolins.

Detailed EQ Control Descriptions

Bass Control Functionality

Explains the Bass control (-12dB @ 120Hz or -16dB @ 45Hz) for low frequency adjustment.

Low Mid Control Functionality

Details the Lo Mid control (+/- 13dB @ 590Hz) for mid-range adjustment.

High Mid Control Functionality

Describes the Hi Mid control (+/- 12dB @ 880Hz) for upper mid-range adjustment.

Advanced EQ Controls: Presence and Treble

Presence Control Functionality

Explains the Presence control (+/- 7dB @ 2.8kHz) for specific mid-range shaping.

Treble Control Functionality

Details the Treble control (+/- 13dB @ 10 kHz) for high frequency adjustment.

EQ and Notch Filter Application Strategies

Discusses switching EQ to channels and using EQ with the notch filter.

Channel 2: Microphone and Pickup Integration

Channel 2 Suitability and Usage

Describes Channel 2 suitability for second pickup or mic, and its limitations for separate sources.

Phantom Power for Condenser Microphones

Explains the requirement for phantom power for condenser mics and cautions regarding switching.

Microphone Use Notes and Recommendations

Provides detailed notes on internal mic usage, placement, and potential issues.

Microphone Usage Techniques and Feedback Management

Internal Mic Performance Considerations

Discusses limitations of internal mics at live volumes and potential issues with positioning.

External Mic Applications for Better Sound

Recommends external mics (Hyper Cardiod DPA 4099) and mic stands for improved performance.

Alternative Sound Enhancement

Suggests using digital reverb as an alternative to mics for adding an impression of air.

Channel Specific Inputs and Phantom Power

MIC INPUT XLR Details

Specifies impedance and compatible mic types for the XLR input.

Stereo Jack Input Routing

Explains how stereo jack inputs are routed to channels 1 and 2.

Phantom Power for Channel 1 Jack Input

Details the 3-way switch for phantom power to the CH.1 Jack Input for active systems.

Phantom Power Caution

Warns users to check wiring specifications before using phantom power.

Advanced Controls: Phantom Power, Mute, and Notch Filter

18V Phantom Power for Channel 2 XLR

Explains the 3-way switch for 18v Phantom Power to the CH.2 XLR input.

Mute/Live Switch Functionality

Describes the Mute/Live switch for output control and silent tuning.

Notch Filter Controls Overview

Introduces the Notch Filter controls, including Q width and frequency.

Notch-Q Control: Bandwidth Adjustment

Details how the Notch-Q knob adjusts the bandwidth of the notch filter.

Notch Filter Frequency, Switches, and Usage Strategies

Notch Frequency Knob Operation

Explains setting the center frequency (50Hz - 6kHz) for the notch filter.

Notch Filter Engagement Switches

Describes the slider switch for filter engagement and the pop-up for channel selection.

Notch Filter Application Techniques

Provides strategies for using the notch filter to cut problematic frequencies like feedback and boom.

Master Volume and Range Control Features

Notch Filter Midrange Adjustment

Details how to adjust notch filter controls for problematic midrange frequencies.

Master Volume Control Function

Explains setting the output level for Line Out, DI Out, and Aux In.

Range Control: High Pass Filter

Describes the 3-way slider switch for high-pass filtering specific instrument types.

Range Settings for Instruments

Outlines specific range settings for Guitar, 12 String, Resophonic, and Nylon guitars.

Battery Powering and Instrument Range Settings

Violin and Bass Range Settings

Specifies range settings for Violin, Mandolin, Ukulele, Cello, and Double Bass.

Battery Powering Options and Usage

Details using PP3 (6F22) batteries, types, life, and recommendations.

Phase Reverse and Technical Specifications

Low Battery Indicator Function

Explains the blue LED indicating low battery voltage and unit failure.

Phase Reverse Switch

Describes the 3-way switch for phase settings and its use for timing or feedback.

Physical Specifications Overview

Lists dimensions, weight, and mic stand bracket connector details.

Channel 1 Electrical Input Specifications

Details Channel 1 input impedance, gain control, and jack input features.

Detailed Electrical Specifications

Channel 2 Input and Output Specs

Covers Channel 2 input impedance, gain control, stereo jack input, and XLR gain.

Aux In/iPod In Specification

Provides the input impedance for the Aux In/iPod In Mini-Jack socket.

EQ and Notch Filter Specifications

Lists specifications for the Baxendall EQ and Notch Filter, including frequency and Q width.

Range Switch (High Pass Filter) Specs

Details the slope profile for the Range Switch's high-pass filter.

Power, Output, and Performance Specifications

Phantom Power Specifications

Details phantom power voltages and current limits for XLR and Jack inputs.

Output Specifications

Lists nominal levels and impedance for Line Output (Jack) and DI Balanced Output (XLR).

Noise Performance and THD

Presents typical noise performance and Total Harmonic Distortion figures for channels.

System Frequency Response

Outlines the system frequency response characteristics for the line out.

Power Supply and Troubleshooting

Power Supply Unit (PSU) Requirements

Specifies requirements for the regulated switching AC/DC adapter and input plug connections.

Environmental Regulations (WEEE/RoHS)

Covers proper disposal of power supplies, batteries, and pre-amplifiers.

Trouble-Shooter Checklist Overview

Introduces the checklist for identifying and solving common issues.

Avoiding Acoustic Feedback and Room Resonances

Provides initial steps to prevent feedback and manage room resonances.

Feedback and Resonance Management Strategies

Using EQ and Phase for Feedback Control

Advises using notch filter, EQ, and phase reverse to cut feedback frequencies.

Sound Absorption and Instrument Blocking

Suggests sound absorbent materials and blocking sound holes to manage feedback.

Pickup and Microphone Mix for Feedback Rejection

Discusses adjusting pickup/mic proportions to reduce feedback.

Limiter/Compressor Use for Peak Control

Recommends limiters or compressors to control peaks causing acoustic feedback.

Troubleshooting Sound Quality Issues

Addressing Uneven String Amplification

Guides on checking pickup seating, placement, and magnetic pole piece adjustment.

Resolving Harsh or Boomy Sound

Offers tips for mic positioning and magnetic pickup adjustment for better balance.

Diagnosing Weak, Dull, or Distorted Sound

Covers checking batteries, gain/EQ levels, DI boxes, and cable integrity.

Troubleshooting Interference: Hum, Buzz, Hiss, Radio

Managing Magnetic Field Interference

Advises keeping cables away from strong magnetic fields and using screened cables.

Eliminating Hum and Buzz

Suggests using GND LIFT, AC Mains Filters, and checking instrument earth connections.

Reducing Hiss and Radio Interference

Covers identifying noisy gear, using treble cut, and employing high-impedance/active pickups.

Troubleshooting Signal and Persistent Issues

Radio Interference and Licensing

Recommends licensed radio mics and changing for conventional mics if interference occurs.

Intermittent or Lack of Signal Diagnosis

Checks connectors, power, gain, mute, batteries, and cable integrity for signal issues.

Addressing Persistent Problems

Advises working through troubleshooting pages before contacting support.

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