Fosi Audio N2 User manual

N2 Headphone
Amplifier User’s Guide
N2

Product Overview
Product Specifications
The N2 features a switch for adjusting gain as well as another switch to
fine-tune bass levels. The switch for high and low gain ensures that you can
use the N2 with a wide variety of headphones, and that your listening volume
needs are covered. The Bass switch gives them some extra punch to make your
songs and movies come to life. The all-aluminum silver body has been carefully
CNC processed and is the best choice for your pocket headphone amplifier.
Audio input:
3.5mm headphone port
Charging port:
Type-C
Power supply:
DC 5V 1A
Op amp:
OPA1642
Headphone output:
3.5mm headphone port
Volume adjustment mode:
High precision volume knob
Internal voltage：
±9.5V
Current amp:
1W triode to tube
3.5mm headphone
output
3.5mm headphone input (sound source)
Power indicator light
Charging indicator light
Type-C charging port
Gain switch
Bass switch
Power Switch /
Volume Control

Quick Setup
How to use?
Package Contents
Fosi Audio N2 ×1 Type-C power cable ×1
User manual ×1 3.5mm to 3.5mm cable ×1
Battery capacity:
2200mAH
Magnification (Av):
GAIN=L:3 GAIN=H:6.8
Frequency response:
10Hz-25KHz
THD+N:
0.005%
Headphone output power:
16ohm/330mW 32ohm/320mW
64ohm/298mW 300ohm/100mW
Product weight:
126g
Battery Life:
about 12h
Low-frequency gain（BASS=ON):
+6dB
SNR:
＞100dB
Headphone output impedance:
16ohm-600ohm
Dimensions:
4.17 x 2.64 x 0.55 inches
(106 x 67 x 14mm)
Step 1: Connect your mobile phone, PC, or other audio source device to N2
(3.5mm audio input).
Step 2: Turn the Power Switch knob slightly to the right to turn on the power.
Note: The blue power indicator indicates sufficient power.
Low battery warning: The blue indicator light will turn red.
Step 3: Connect your headset or headphone to N2 by 3.5mm headphone jack,
adjust the volume control, then enjoy it!
1.Can it be used while charging?
- It is not recommended to use while charging, because current disturbance
occurred when charging may lead to noise.
2.How long can the N2 play?
- N2 equips with 2200 mAH battery supports 12-hour playtime.
Q&A/ Troubleshooting

Warranty Information
About Fosi Audio
3.Can I connect the N2 with an iOS or Android device?
- Yes, 3.5mm stereo interface meets the needs of most devices.
4.It is turned to the maximum, but the volume is still not loud enough.
What should I do?
- Our product is designed with a gain switch, if the sound is not loud
enough, you can flip the gain switch up.
5.All cables are connected, but there is no audio output?
- Please check the power indicator is on.
- If the power indicator lights, check that the VOL knob is in the
smallest state, if it is, and it is normal to rotate clockwise in the
minimum state.
6.Get noise when playing music?
- Try different 3.5mm audio cable, headphone, music source,
and check again.
- Please keep this device away from other electronic devices.
- Try different playback software and song detection.
All Fosi Audio products have an 18-month limited warranty on parts and
labor from the date of purchase. Please contact us if you have any
Fosi Audio designs and builds innovative audio products with all your music in
mind. Great sound, simple but elegant designs, high-quality materials, and
truly useful features are what Fosi Audio is about. We sincerely hope you get
as much enjoyment from our products as we’ve had to create them!
Our website: www.fosiaudio.com
Amazon store: www.amazon.com/fosiaudio
Our Youtube channel: Fosi Audio
Facebook page: Fosi Audio
WhatsApp: [phone]
After-sale Service and Technical Support Email:
[e-mail]
[e-mail]
problems.