H P A - 4

4 C H A N N E L H E A D P H O N E / A M P L I F I E R / L I N E D I S T R I B U T O R

Congratulations on your choice of headphone/amplifier/line distributor — you have purchased one of the finest stereo headphone/ am- plifier/line distributors on the market today. This unit was developed using the expertise of professional sound engineers and working musicians. You will find that your new NADY AUDIO HPA-4 has superior performance and greater flexibility than any other headphone/ amplifier/line distributors in its price range. Please read this manual carefully to get the most out of your new unit.

Thanks for selecting NADY AUDIO as your choice in headphone/amplifier/line distributor.

FEATURES

With extensive switching functions, extreme efficiency, and unmatched sound quality, the ultra-versatile HPA-4 is a universal 4-channel multi-purpose headphone amplifier/line distribution system—perfect for the most demanding professional stage and studio applica tions.

Four totally independent stereo high-power headphone ampli- fier/line distribution channels in a convenient single rack pack- age—an ingenious, easy-to-operate unit allowing a maximum variety of both useful monitoring and stereo line level signal dis- tribution options.

Input Source Select switches and Phone and Line 1/4" TRS ste- reo outputs on each channel, and 4 independent stereo input sections (each with servo-balanced L & R 1/4"TRS jacks) en- able independent selection of any of the 4 stereo signals for each headphone amp/line distribution channel. This allows se- lecting from up to 4 completely independent monitor signals for each set of headphones connected to the HPA-4 for optimum monitoring flexibility or 4 separate choices for each channel’s Line Output for enabling many useful, simple audio switching/ routing solutions.

Separate Volume control for each channel adjusts the level to both Phone and parallel Line outputs

Easily expandable for optimum versatility in any application—up to four HPA-4’s can be daisy chained for additional fully select- able headphone/line distribution requirements

No-compromise circuit design, stringently selected tight-toler- ance components and low-noise, extremely linear or amps for reference-quality, transparent audio with maximum headroom even at extremely high headphone volume levels

High-quality, rugged construction for maximum reliability

Shielded internal dual regulated power supply with ~115V(60Hz)/~230V(50Hz) select switch and fused IEC power cord connector

TABLE OF CONTENTS

FEATURES

2

WARNING

3

INSTALLATION

4

FRONT & REAR PANEL CONNECTIONS

5

CONTROLS & INDICATORS

5

APPLICATIONS

6

1.

Using the HPA-4 as a headphone amplifier

6

2.

Using the HPA-4 as a line distribution unit

6

3.

Daisy chaining multiple HPA-4’s together for additional

 

 

headphone/line distribution requirements

6

SPECIFICATIONS

6

NOTES

7

Date of Purchase ____________________________________

Dealer’s Name ______________________________________

City _______________________________________________

State _____________________ Zip _____________________

Model # ____________________________________________

Serial # ___________________

2

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Nady Systems HPA-4 manual Features, Table of Contents

HPA-4 specifications

Nady Systems has long been recognized as a leader in innovative audio solutions, and the HPA-4 is no exception. This powerful headphone amplifier is engineered to deliver superior sound quality and versatility, making it an ideal choice for both amateur and professional audio enthusiasts.

One of the standout features of the HPA-4 is its ability to handle multiple audio sources simultaneously. With four separate headphone outputs, this amplifier allows multiple users to listen in without compromising on sound quality. Each output has its volume control, providing users with individual adjustment options to suit their preferences. This is particularly beneficial in studio settings, classrooms, or when collaborating with other musicians.

The HPA-4 utilizes high-quality components to ensure clear and accurate audio reproduction. Its low-distortion circuitry provides a clean signal path, delivering enhanced dynamics and frequency response. This means that whether you are mixing tracks, listening to music, or gaming, the audio experience remains faithful to the source material.

Another remarkable characteristic of the HPA-4 is its compact and rugged design. The unit is built with durability in mind, making it perfect for both studio and mobile use. Its lightweight yet sturdy chassis allows for easy transport without compromising on performance. Users can confidently take the HPA-4 to live events, studios, or practice rooms.

The HPA-4 also includes advanced technology features such as a dedicated 1/4-inch and a 1/8-inch headphone output. This caters to a wide range of headphone types, accommodating both professional-grade models as well as consumer-friendly options. Additionally, it offers a direct input for connecting to mixers or audio interfaces, ensuring compatibility with various audio setups.

For users who demand flexibility, the HPA-4 comes equipped with a power supply, as well as battery operation options. This versatility means you can use it as needed, whether you’re in a studio, on location, or simply enjoying music at home.

In summary, the Nady Systems HPA-4 headphone amplifier stands out with its multiple headphone outputs, high-quality audio processing, robust design, and versatile connectivity options. It is an exceptional addition to any audio toolkit, serving both professional and casual users alike while ensuring an unparalleled listening experience. Whether for personal enjoyment or professional applications, the HPA-4 delivers on multiple fronts, solidifying its place as a staple in modern audio technology.