Fosi Audio PH05 Headphone Amplifier User Manual

: June 1, 2024
: Fosi Audio

Table of Contents

Fosi Audio PH05 Headphone Amplifier
Product Usage Instructions
Introduction
Packing List
Product Overview
Specifications
Operation Guide
FAQ
Warranty and Maintenance
CONTACT
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

Fosi Audio PH05 Headphone Amplifier

Product Usage Instructions

Do not power on the device until all connections have been completed.
Prepare the following items: PH05 unit, audio source device with a 3.5mm output, 3.5mm to 3.5mm auxiliary cable, and headphones with a 3.5mm plug.
Connect the audio output interface of your source device to the input interface of the PH05 using the 3.5mm auxiliary cable.
Insert the headphones into any of the channel output ports on the PH05. Turn the volume knob counterclockwise to the minimum to avoid sudden high volume.
Connect the PH05’s power interface using the 12V/1A power adapter and press the power button to turn on the device.
To mute the device, briefly press the multifunction button. Press again to cancel the mute and resume music playback.

Introduction

Thank you for purchasing the Fosi Audio PH05 HiFi headphone amplifier!
The PH05 is a high-performance five-channel headphone amplifier that utilizes the Texas Instruments NE5532 operational amplifier chip, relying on high- quality capacitors, inductors, and resistors to achieve stable and pure high- fidelity audio output. The PH05 features five 3.5mm audio output ports, allowing for powering up to 5 pairs of headphones and up to 5 independent volumes, with outstanding audio quality. Each channel provides a rated output power of 310mW (32Ω load), and the volume of the five output channels can be adjusted independently, ensuring consistent sound quality even with headphones of various impedances. The PH05 also features a one-touch mute function for quick and convenient switching. Designed specifically for audiophiles, this compact headphone amplifier is sure to provide you with a true HiFi music experience.

Packing List

Fosi-Audio-PH05-Headphone-Amplifier-FIG-1

Product Overview

Fosi-Audio-PH05-Headphone-Amplifier-FIG-2

Power/Mute Multifunction Button
Master Volume Control Knob
Channel 1-5 Independent Volume Control Knobs
Power/Mute Indicator Light
3.5mm AUX Input
3.5mm Headphone Outputs
DC 12V Power Input

Specifications

Rated Output Power	310mW ×5
Recommended Headphone Impedance	16Ω-300Ω
Input Interface	3.5mm AUX
Output Interface	3.5mm Headphone Out ×5
SINAD	90dB
SNR	105dB
Dynamic Range	105dB
THD	0.001%
Noise Floor	25μV
Crosstalk	90dB
Frequency Response	20Hz-20kHz (±0.5dB)
Input Voltage and Current	DC12V/1A

Operation Guide

Please do not power on the device until all connections have been completed.

Prepare the following: a PH05 unit, an audio source device with a 3.5mm output, a 3.5mm to 3.5mm auxiliary cable, and headphones with a 3.5mm plug;
Use the 3.5mm auxiliary cable to connect the audio output interface of your source device to the input interface of the PH05;
Insert the headphones into any of the channel output ports on the PH05. Turn the volume knob counterclockwise to the minimum to avoid sudden high volume during music playback, which could potentially damage your hearing;
Connect the PH05’s power interface using the 12V/1A power adapter. Then, press the power button briefly to turn on the device. The indicator light will turn orange upon powering on;
During use, you can quickly mute the device by briefly pressing the multifunction button. The indicator light will turn blue when muted. To cancel the mute and resume music playback, press the button again, and the indicator light will return to orange.

FAQ

Is it possible to use five AUX inputs with a single headphone output?
The PH05 is designed for one input with five outputs and does not support reverse usage.
Can the PH05 be used for microphone calls?
The PH05 does not support microphone signal input, and therefore it cannot be used for calls.
What should I do if only one side of the headphones has sound output?
- Please ensure that the 3.5mm audio cable you are using is a stereo cable, not a mono cable;
- If the issue of no sound output on one side occurs in all five outputs, it may be a problem with the headphones. If it happens with only one output, please contact customer service for product exchange or return.

If you have any further questions, please contact our support team at support@fosiaudio.com.

Warranty and Maintenance

Fosi Audio pledges to give a 24-month limited warranty and support from the date of purchase. If you encounter any problem when using our product, please contact our support team at support@fosiaudio.com.
About Us
Fosi Audio designs and builds innovative audio products with all your music in mind. Great sound, simple but elegant designs, high-quality components, and truly useful features are what Fosi Audio pursues. We sincerely hope you can get as much enjoyment from our products as we’ve had to create them!