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NIIMBUS ULTIMATE HPA US 4+ - User Manual

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1
HEADPHONE AMPLIFIER
NIIMBUS ULTIMATE SERIES
HPA US 4+
USER´s MANUAL
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Summary

General Safety Instructions

Safety Precautions

Comprehensive safety guidelines including handling liquids, power, grounding, cords, fuses, and voltage settings.

Service and Maintenance

Service; Repair Limitations

Defines user's limitations for servicing and when to seek professional help.

Grounding Jumper Settings

Connection and Connectors

Analog Signal Connections

Pin-out and connection details for balanced and unbalanced analog inputs/outputs.

Headphone Output Connections

Specifications for balanced 4-pin XLR and unbalanced 1/4" headphone outputs.

Power, Grounding, and Fuse

Remote Control Usage

Remote Control Functions

Detailed description of the remote control buttons and their operational functions.

System Block Circuitry

Power Switch and Signal Inputs

Input Gain Configuration

Input Pre-Gain DIP Switches

Configuration of input gain/attenuation using rear panel DIP switches.

Selecting Audio Inputs

How to select between different audio inputs using front panel buttons or remote.

Audio Control Functions

Volume Attenuator Operation

Explanation of the volume control, its stepping, and servo motor actuation.

Optimizing Input Gain (PRE-GAIN)

Understanding the PRE-GAIN Method

Explanation of the PRE-GAIN concept for matching source and headphone levels.

Guide to PRE-GAIN Optimization

Practical steps to adjust PRE-GAIN for optimal listening experience.

Gain and Output Activation Settings

Input PRE-GAIN Switch Settings

Specific settings for the input PRE-GAIN DIP switches for various gain levels.

Headphone Output Activation

How to enable or disable the headphone outputs using dedicated buttons.

Line Output Control and Headphone Outputs

Line Output Activation Control

How to enable or disable the line outputs using front panel buttons or remote.

Balanced Headphone Output Details

Information on the 4-pin XLR balanced headphone output and its pin configuration.

Unbalanced Headphone Output Details

Information on the 1/4" jack unbalanced headphone outputs and their connection details.

Line Output Configuration

Output Signal Routing and Error Handling

Error Reporting and Protective Circuits

Description of the unit's protective measures and error detection system.

Software Features and Settings

Technical Explanations and Concepts

PRE-GAIN Functionality Explained

Detailed explanation of the PRE-GAIN function and its technical rationale.

Technical Data and Specifications

Unit Dismantling and Jumper Settings

Internal Settings and Jumper Configuration

Advanced Internal Settings

Warranty and Service Information

NIIMBUS ULTIMATE HPA US 4+ Specifications

General IconGeneral
InputsXLR
Outputs1x 4-pin XLR
THD+N0.001% @ 1kHz
Output Impedance0.1 Ohm
Signal-to-Noise Ratio>120 dB
Total Harmonic Distortion0.001% @ 1kHz
TypeHeadphone Amplifier
Power Consumption30W

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