MFJ MFJ-616 User Manual

MFJ-616 Speech Intelligibility Enhancer
TM
Instruction Manual
1
INTRODUCTION
The MFJ-616
Speech Intelligibility Enhancer
TM
is a powerful communication tool that surrounds
your operating position with crystal-clear electronically-enhanced audio. It also puts the fun back
into ham radio! Here are some of the high-tech features we think you'll enjoy:
Studio Quality:
The
Speech Intelligibility Enhancer
TM
is designed to drive two identical high
quality speakers installed three or more feet apart. This configuration improves intelligibility,
enhances frequency response, and dramatically increases spatial presence. Once your system is
set up, you'll think you're in a broadcast studio!
Speech Intelligibility Enhancer
TM
:
Every radio has different audio characteristics--and
everyone's hearing response changes over time. Our exclusive
Speech Intelligibility Enhancer
TM
tailors the sound of your radio especially for your ears. Young or old, you'll hear more clearly
than ever before!
Dual Amplifiers:
Two powerful monolithic IC amplifiers deliver deep, rich, undistorted audio
to high quality, hi-fidelity speakers (not supplied).
Adjustable Balance:
A front-panel
Balance
control aligns speakers for dead-center positioning
regardless of speaker placement or differences in ear sensitivity.
Easy-to-Operate:
Large knobs, easy-to-access switches, and a wide-open panel layout make the
MFJ-616 very easy to set up and use.
Dual Input:
Switch between radios with the push of a button--no messing with patch cables
behind the desk.
By-Pass Function:
Switch
Speech Intelligibility Enhancer
TM
in or out without cutting off the
speakers. This feature is especially helpful for sound comparisons during the frequency set-up.
Multiple Outputs:
Choose individual 3.5mm monaural jacks or a stereo jack wired for
computer-style speakers. Also, a front panel switch turns off your speakers, the stereo headset
stays active. Front panel phone jack is attenuated to headset levels (deactivated with internal
jumpers).
Multiple Power Sources:
Use transceiver's 13.8-volt supply, wall adapter, dedicated supply, or
12-volt battery to power your unit.
Rugged Construction:
Attractive all-metal cabinet, conservative component selection, and
space-age SMD circuitry ensure solid performance for years to come. Fully covered by MFJ's
"No Matter What" one year limited warranty.
Before attempting to operate your MFJ-616, please read this manual thoroughly. It contains
important details you'll need to know to obtain the best performance from your unit.

MFJ MFJ-616 Specifications

General

Brand	MFJ
Model	MFJ-616
Category	Stereo Equalizer
Language	English

Summary

Introduction to MFJ-616 Features

Studio Quality Audio

Explains the dual-speaker configuration for improved intelligibility, frequency response, and spatial presence.

Speech Intelligibility Enhancer Function

Describes the exclusive feature that tailors radio sound to individual hearing characteristics for clearer listening.

Dual Amplifier Power

Highlights two IC amplifiers delivering rich, undistorted audio to high-fidelity speakers.

Adjustable Speaker Balance

Features a front-panel control to align speakers for dead-center positioning and compensate for ear sensitivity.

Easy-to-Operate Design

Notes large knobs, accessible switches, and a clear panel layout for simple setup and use.

Dual Radio Input Switching

Allows switching between two radios with a button, eliminating the need for patch cables.

Bypass Function for Comparison

Enables switching the enhancer in/out for comparative sound checks without cutting off speakers.

Multiple Speaker and Headphone Outputs

Offers individual 3.5mm jacks or a stereo jack for computer speakers; front switch turns off speakers for headset.

Flexible Power Source Options

Supports various power options including transceiver supply, wall adapter, or 12-volt battery.

Rugged Construction and Warranty

Emphasizes durable all-metal cabinet, quality components, and SMD circuitry for reliable, long-term performance.

MFJ-616 Jacks and Controls Overview

Front Panel Controls Explained

Details the purpose and function of each control knob and switch on the front panel of the unit.

Rear Panel Connections Guide

Describes the rear panel jacks for power input, speaker outputs, and audio inputs from radios.

Setting Up the MFJ-616 Enhancer

Connecting the Power Source

Guides on connecting a stable 12-15 Vdc source, recommended fuse protection, and plug specifications.

Headphone Usage and Setup

Advises on using stereo headphones (8-40 Ohms) and the 1/4" jack, with notes on jumper settings for mono.

Speaker Connection and Phasing

Recommends matched high-quality speakers (4-6 inch, 4-16 Ohm) and explains stereo/mono patching.

Connecting Your Radio to the Enhancer

Auxiliary Jack Input Method

Explains using the transceiver's auxiliary audio output jack, noting impedance considerations for the 500 Ohm input.

Headphone Jack Input Method

Describes connecting to the transceiver's headphone jack, which often disables the internal speaker and provides attenuation.

External Speaker Line Input Method

Covers connecting the external speaker line, mentioning the need for a 10-Ohm termination resistor and potential attenuation.