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Aphex AURAL EXCITER III User Manual

Aphex AURAL EXCITER III
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AURAL EXCITER® TYPE III
MODEL 250
OPERATING GUIDE
&
SERVICE MANUAL
APHEX SYSTEMS LTD.
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Aphex AURAL EXCITER III Specifications

General IconGeneral
BrandAphex
ModelAURAL EXCITER III
CategoryComputer Hardware
LanguageEnglish

Summary

Introduction

Operational Characteristics

New Features in the Model 250

Details new processing features, dual-channel operation, and noise reduction modes.

Spectral Phase Refractor (SPR)

Explains the SPR function for correcting low-frequency phase delay and restoring clarity.

Adjustable Harmonics Level and Timbre Mixing

Covers controls for harmonic density and type, offering more flexibility.

Servo Balanced Inputs and Outputs

Describes advantages of servo-balanced connections for noise rejection and signal integrity.

Null Fill

Introduces the NULL FILL control to compensate for phase nulling and enhance presence.

Typical Applications

Illustrates various uses of the Aural Exciter for audio enhancement in different scenarios.

Specifications

Lists technical specifications like frequency response, THD, IMD, and power requirements.

Warranty and Service Information

Provides details on product warranty, repair procedures, and contact information.

Installation

Unpacking

Instructions for safely removing the unit from its packaging and checking for damage.

Setting Input Sensitivity

Guides on selecting the correct operating level (-10 or +4 dBu) for optimal performance.

Audio I/O (Input/Output) Connectors

Details the XLR connectors and recommended wiring practices for audio connections.

I/O Connection Considerations

Discusses impedance matching and wiring advice for optimal audio interfacing.

AC Line Connection

Covers connecting the unit to AC power, including voltage selection and fuse requirements.

Remote Control Connector

Explains the use of the remote control connector for bypass functionality.

Installing the Type III in an Equipment Rack

Provides guidelines for mounting the unit in a standard audio equipment rack.

Applying Power and Initial Checkout

Outlines the steps for powering up the unit and performing a basic functional check.

Front Panel Controls

NR MODE Switch

Selects between two noise reduction modes (A or B) with associated indicator LEDs.

NR THRESHOLD Control

Sets the threshold level for noise reduction action, indicated by LEDs.

TUNE Control

Sets the frequency of the high-pass filter in the Ax sidechain, defining the exciter effect domain.

PEAKING Control

Adjusts damping on the high-pass filter, accentuating the TUNE frequency and creating a dip.

NULL FILL Control

Compensates for phase nulling by adding a bandpass signal to the high-pass filter.

HARMONICS Control

Controls the density of generated harmonics via a VCA modulation process.

TIMBRE Control

Sets the type of harmonic signal (even or odd) generated by the HARMONICS control.

MIX Control

Introduces the amount of Aural Exciter enhancement mixed with the original signal.

Ax Switch

Turns the Aural Excitement process On or Off with an indicator LED.

SOLO Switch

Allows auditioning the Aural Excitement signal alone, without the main audio.

SPR Switch

Controls the Spectral Phase Refractor effect for restoring clarity and openness.

RELAY Switch

Provides a two-channel hard-wire bypass of the unit's circuitry.

POWER Switch

Controls the AC power to the unit, switching it on or off.

Applications

Initial Settings

Guides on setting up the unit for initial operation in line or sidechain configurations.

Exciting a Recorded Tom or Kick Drum

Provides specific settings for enhancing the sound of recorded tom or kick drum hits.

Recording a Snare Drum with Excitement

Offers settings for adding excitement and snap to snare drum recordings.

Exciting FM Audio for Television and Radio

Details settings for improving broadcast audio quality for FM and TV.

Exciting AM Broadcast Audio

Provides settings to enhance the sound quality of AM radio broadcasts.

User Templates

Offers blank templates for users to record their custom front panel settings.

Circuit Description

Main Audio Path

Describes the signal flow through input stages, filtering, and output stages.

Ax Sidechain Path

Details signal processing within the sidechain, including filters, generators, and noise reduction.

Power Supply

Explains the components and function of the unit's power supply circuit.

Test and Nulling Procedures

MAIN AUDIO BOARD

Procedures for testing and calibrating main audio board components like CMRR, gain, and distortion.

CONTROL BOARDS

Procedures for testing and calibrating control boards, including tune, peaking, and NR modes.

Schematics

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