Nobsound NS-03G - User Manual

1. Before turning on the amp, please make sure the volume knob
at the leftmost end, avoid high volume ( high output power )
damaging your speakers.
2. Default OPTIONAL 19V power supply, whose output power is
enough to drive most home speakers. If you buy the version
without power supply or want higher output power, please
prepare high-quality power supply by yourself. Powered by 24V
power supply(4Ω load), the actual output power can reach 100W.
NS-03G 100W Mono Channel
Subwoofer /Full Frequency Power Amplifier
NOTICE
1. Please connect power adapter to NS-03G firstly and then
plug the power cord to the socket.
2. Connect audio device such as TV, CD player to the amp’s
input with high-quality 3.5mm AUX cable, and connect
proper passive speakers or subwoofers to amp’s output.
3. Rotate the volume knob from the leftmost end, the LED
indicator will light up, then you can rotate the volume
knob to get proper volume and enjoy HiFi music.
HOW TO USE
PARAMETERS
1
Model
Version
Number of channel
Audio input
Audio output
Max output power
Power amp chip
Op amp
Speaker impedance
Matched L/R Speakers
Matched subwoofer
Frequency response
Input sensitivity
THD
SNR
Working voltage
Default power supply(optoinal)
Dimensions(W*D*H)
Package dimensions(W*D*H)
Net weight
Package weight
Mono
3.5mm AUX
Banana speaker jacks
100W(24V, 4Ω load)
TPA3116D2
TL072
4Ω-8Ω
≤ 280mV
≤ 0.01% (1KHz)
≥ 118dB
DC 12V-24V(5.5mm / 2.5mm)
19V
69*88*33mm / 2.72*3.46*1.30in
150*150*50mm / 5.91*5.91*1.97in
190g / 0.42lb
310g / 0.68lb
2
NS-03G SUB
Subwoofer
NS-03G FR
Full Frequency
20Hz-20KHz
3-10 inch 10-200W
5-10 inch 30-150W
20Hz-180Hz

Summary

Important Notices

Pre-operation Safety Check

Ensure volume knob is at the leftmost end before turning on the amp to avoid damaging speakers.

Power Supply Considerations

Uses 19V supply; 24V can reach 100W at 4Ω. Consider a high-quality supply for higher output.

How to Use

Initial Power Connection

Connect the power adapter to the NS-03G amplifier first, then plug the power cord into the socket.

Audio Source and Speaker Connection

Connect audio devices via AUX cable and passive speakers/subwoofers to the amp's output.

Operation and Volume Adjustment

Turn volume knob from left; LED lights up. Adjust for desired volume and enjoy HiFi music.

Trouble-Shooting Manual

Troubleshooting: Unit Not Starting Up

Addresses issues related to power connection, switch, adapter, or audio source for startup problems.

Troubleshooting: No Sound Output

Covers reasons like incorrect input, mute, shorted output, poor adapter, cables, source, or speakers.

Troubleshooting: Noise Issues

Solutions for noise include checking power adapter, cables, audio source, and matched speakers.

Troubleshooting: Bluetooth Connectivity

Resolves issues with searching, pairing, or interference for Bluetooth connection problems.

Troubleshooting: Distortion and Stability

Addresses distortion from output power and unit stopping due to exceeding rated output or other faults.

Contact Information

Company Contact Details

Provides the company's address, contact person, telephone number, and email for inquiries.

Overview

1. Function Description
2. Usage Features
3. Maintenance Features

The Nobsound NS-03G is a versatile power amplifier designed for both subwoofer and full-frequency audio applications, offering a mono channel output. This device is engineered to enhance your audio experience by providing robust amplification for various speaker setups.

Function Description

The NS-03G serves as a power amplifier, capable of driving either a single subwoofer or a full-range passive speaker. It takes an audio input from a source device and amplifies it to power your chosen speaker(s). The amplifier is available in two main versions: a "SUB" version specifically optimized for subwoofers, and a "FR" (Full Frequency) version designed for full-range speakers. Both versions share a common core design but are tailored for their respective audio applications.

The primary function of the NS-03G is to boost the low-level audio signal from your source device (like a TV, CD player, phone, or computer) to a level sufficient to drive passive speakers. This allows you to enjoy louder, clearer, and more dynamic sound from your audio system. The mono channel output means it is designed to power a single speaker or a single channel of a stereo setup if used in pairs.

Usage Features

The NS-03G is designed with user-friendliness in mind, offering straightforward setup and operation.

• Input Connectivity: The amplifier features a 3.5mm AUX input, making it compatible with a wide range of audio source devices such as smartphones, tablets, MP3 players, TVs, CD players, and computers. This universal input ensures easy integration into existing audio systems.
• Output Connectivity: For speaker connection, the NS-03G utilizes banana speaker jacks. This type of connector is known for its secure and reliable connection, ensuring optimal signal transfer to your speakers or subwoofer.
• Volume Control: A prominent volume knob is provided for easy adjustment of the output level. Users are advised to set the volume to the leftmost (minimum) position before turning on the amplifier to prevent potential damage to speakers from sudden high output.
• Power Supply: The amplifier typically comes with an optional 19V power supply, which is generally sufficient for most home speakers. However, for users seeking higher output power, the device can be powered by a 24V power supply, enabling it to reach its maximum rated output, especially when driving 4Ω loads. This flexibility allows users to customize the power delivery based on their specific speaker requirements and desired performance.
• Indicator Light: An LED indicator is integrated into the design. This light illuminates when the amplifier is powered on and ready for operation, providing a visual cue to the user.
• Simple Setup Process: The "HOW TO USE" guide outlines a simple three-step process:
  1. Connect the power adapter to the NS-03G first, then plug the power cord into a wall socket.
  2. Connect your audio source device to the amplifier's input using a high-quality 3.5mm AUX cable. Then, connect your passive speakers or subwoofers to the amplifier's output.
  3. Rotate the volume knob from the minimum position. Once the LED indicator lights up, you can further adjust the volume to your preferred level and enjoy your music.
• Version Specificity: The "SUB" version is tailored for subwoofers, providing a frequency response optimized for low-end audio. The "FR" version is designed for full-range speakers, offering a broader frequency response suitable for general audio playback. This distinction allows users to select the amplifier that best suits their specific speaker type and audio preferences.

Maintenance Features

The NS-03G is designed for reliable operation, and its maintenance primarily involves proper usage and troubleshooting common issues.

• Troubleshooting Guide: A comprehensive "TROUBLE-SHOOTING MANUAL" is provided to help users diagnose and resolve common problems. This guide covers issues such as:
  • Cannot start up: Solutions include checking power adapter connection, ensuring the power switch is pressed/toggled, or trying a different power adapter if the current one is faulty.
  • No sound output: This section addresses issues like disconnected or muted audio sources, volume set to minimum, incorrect input mode selection, output shorting, or unmatched speakers. Solutions involve connecting the audio source, turning up the volume, selecting the correct input, checking output connections, or changing speakers.
  • Noise: Problems related to noise can be resolved by using a better power adapter, changing to shielded audio/speaker cables, testing with a different audio source (like a mobile phone), or using high-quality matched speakers.
  • Bluetooth connectivity issues (for models with Bluetooth): Solutions include searching for the correct Bluetooth name, disconnecting other paired devices, and ensuring Bluetooth input isn't prioritized or already paired.
  • LINE input connectivity issues: Similar to Bluetooth, this involves disconnecting other devices that might be interfering.
  • Distortion: This is often caused by the output power exceeding the rated output. The solution is to turn down the volume of the amplifier, preamp, or source device.
  • Stopping working after a while: This typically indicates exceeding the rated output power, and the solution is to reduce the output.
• Preventative Measures: The "NOTICE" section emphasizes important preventative measures:
  • Always ensure the volume knob is at the minimum position before turning on the amplifier to prevent potential damage to speakers from sudden high output.
  • Users are advised to prepare a high-quality power supply if they purchase the version without one or desire higher output power, as the quality of the power supply directly impacts performance and longevity.
• Robust Design: While not explicitly detailed as a maintenance feature, the use of quality components like the TPA3116D2 power amp chip and TL072 op amp suggests a design intended for stable and durable performance, minimizing the need for frequent maintenance.
• Customer Support: Contact information, including an address, contact person, telephone number, and email, is provided for users who require further assistance or encounter issues not covered in the manual. This ensures that users have access to professional support for any complex problems or inquiries.

In summary, the Nobsound NS-03G is a user-friendly and adaptable power amplifier designed to deliver enhanced audio performance for both subwoofers and full-range speakers. Its intuitive controls, flexible power options, and comprehensive troubleshooting guide make it an accessible choice for audio enthusiasts looking to upgrade their sound system.

Nobsound NS-03G Specifications

General

Product Model	NS-03G
Audio Input	RCA
Impedance	4-8Ω
Output Impedance	4-8Ω
Input Impedance	100kΩ
Input Sensitivity	300mV
Frequency Response	20Hz-20kHz
Power Supply	DC 12V-24V
Power Adapter	DC 12V-24V
Audio Output	Speaker Output
Channel	2 (Stereo)
SNR	> 90dB
Signal-to-Noise Ratio	> 90dB