Nady Systems manual Applications, Specifications, Using the HPA-4 AS a Headphone Amplifier

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APPLICATIONS

USING THE HPA-4 AS A HEADPHONE AMPLIFIER

Connect a stereo (L & R) program source (2 x 1/4” plugs) to the rear of the HPA-4 using one of the available 4 x stereo INPUT (3) pairs on the rear panel.

Connect a set of headphones using a stereo 1/4” cable to any of the HEADPHONE OUTPUTS (1) on the front panel of the HPA-4. Select the source signal from the rotary SELECTOR (4) switch for the channel in use. Set to an appropriate level for monitoring. (Note: If only the LEFT (MONO) channel input is used, the mono signal will be provided automatically at both the Left and Right sides of the PHONE (1) and LINE (2) outputs.)

Since the HPA-4 offers four independent channels, you can have four individual mixes for four musicians with a single unit. In studio recording applications, you can configure sub-groups, aux sends or single outputs of your audio mixer to feed signals independently to the HPA-4. This enables each musician to receive a specific configuration of instruments of their choice

in their headphones.

[Note - If four headphone outputs are not enough, you can interface and link any number of HPA-4’s for additional outputs (see be- low).]

USING THE HPA-4 AS A LINE DISTRIBUTION UNIT

To use the HPA-4 as a line distribution unit all you have to do is use the line output instead of the headphone output on the front of the unit for the line distribution signal feed. All other operation is identical as using the unit as a headphone amplifier.

Daisy chaining multiple HPA-4’s together for additional headphone/line distribution requirements.

It is very easy to chain multiple HPA-4’s together. Use appropriate single stereo 1/4” TRS to two 1/4” TS (2 x mono) adapter cables and make connections from the LINE DISTRIBUTION OUTPUT (2) channels on the front of your first HPA-4 unit to the stereo (L&R) AUDIO INPUTS (3) on the rear of your second HPA-4.

This effectively allows an additional (fully selectable) 4 headphone outputs and an additional 4 line outputs! You can continue to chain up to four HPA-4 units together using this same procedure.

SPECIFICATIONS

AUDIO INPUTS

 

Connectors

1/4" jack

Type

Unbalanced

Impedance

47k Ohms

Peak input level

+25dB

Gain control range

+35dB

HEADPHONE POWER AMPLIFIER OUTPUTS

Max.output level

300mW@32 Ohms (max 1W @ 32 Ohms)

Output impedance

22 Ohms

Max. gain

+20 dB

LINE DISTRIBUTION OUTPUTS

Connectors

1/4" jack

Type

Unbalanced/Parallel

DISTORTION, FREQUENCY RESPONSE,

S/N RATIO & CROSSTALK

FUNCTION CONTROLS

 

Volume

Per channel, variable

Signal selectors

Per channel, Variable

POWER SUPPLY

 

AC requirements

Selectable, ~100-120 VAC,

 

~ 200-240V AC, 50-60 Hz

Power consumption

11.5VA

Fuse

100-120 VAC: 630 mA (slow-blow)

 

200-240 VAC: 315 mA (slow-blow)

 

100-240 VAC: 500 mA (slow-blow)

 

5X20mm glass type

Power cord connector

Standard IEC receptacle

 

with built-in fuse holder

PHYSICAL

 

Dimensions

1.75"X 19"X 8.5"(44.5X482.6X217mm)

Weight

6.93lbs (3.15Kg)

Distortion

0.02%

Frequency response

20Hz~20kHz, 0dB~-2B

S/N Ratio

Better than 80dB

Crosstalk rejection

>68dB@1kHz; 20dBinput

The specifications above are correct at the time of printing of this manual. For improvement purposes, all specifications for this unit, including design and appearance, are subject to change without prior notice.

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Contents Gear ACK Features Table of ContentsImportant Safety Instructions Power Connection InstallationContents InspectionFront Panel Rear Panel Controls & IndicatorsFront & Rear Connections Front PanelUsing the HPA-4 AS a Line Distribution Unit SpecificationsUsing the HPA-4 AS a Headphone Amplifier ApplicationsPage Service Information
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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.