FRONT & REAR CONNECTIONS

(5)

(4)

(6)

FRONT PANEL

(1) (2)

REAR PANEL

(8)

(9)

(7)

(3)

FRONT PANEL

(1)STEREO HEADPHONE OUTPUTS

Four stereo 1/4” output jacks for connecting four stereo head- phones

(2)DIRECT LINE DISTRIBUTION OUTPUTS

Four stereo 1/4” line level output jacks for use for line distribution

REAR PANEL

(3)AUDIO INPUTS

Four stereo-pair balanced, line level 1/4” TRS jacks for 4 stereo (L & R) input signals. 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.

(8)POWER CONNECTOR WITH FUSE HOLDER Standard IEC power cord receptacle used to connect the AC power to your unit. It features a built-in fuse holder for a 5X20mm, 0.5A/250V slow-blow fuse. If the fuse continuously blows, shut off the unit and have it serviced by qualified service personnel.

CONTROLS & INDICATORS

FRONT PANEL

The HPA-4 has four independent headphone amplifiers or line distribution channels. The unit provides 2 rotary controls and 2 stereo jacks per channel.

(4)INPUT SIGNAL SOURCE SELECT SWITCHES

Each channel features a rotary selector switch which allows you to select any of the 4 stereo input source signals connected to the INPUTS (3) of the HPA-4 to be routed to the selected chan- nels of the headphone amplifier and line distribution output. Sim- ply choose the source signal desired for that channel.

(5)VOLUME CONTROLS

Each channel features a rotary volume pot for variable adjust- ment of the desired output level.

(6)POWER LED INDICATOR

This LED indicator illuminates when the unit is powered on by the rear panel POWER SWITCH (7).

REAR PANEL

(7)POWER SWITCH

To turn the unit ON or OFF, press the upper or lower portion of this button as indicated. The front panel POWER LED INDICA- TOR (6) will illuminate when the power is “ON”. Before turning on this unit, verify connection to the proper voltage AC source, check all connections and turn down the level controls of equipment connected to the outputs.

(9)AC VOLTAGE SELECTOR SWITCH

Before plugging in the power cord, check to see that the unit is set for the proper voltage for your area: ~115v (60Hz) or ~230V (50Hz).

(Note: use at the improper voltage can damage your unit and void the warranty.)

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Nady Systems HPA-4 manual Front & Rear Connections, Controls & Indicators, Front Panel Rear Panel

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.