Portable HiFi Bluetooth Headphone Amplifier for Audiophile Listening

The Fosi Audio N3 Portable Bluetooth Headphone Amplifier is a compact and versatile portable headphone amplifier designed for audiophiles, music lovers, commuters, and mobile HiFi enthusiasts who want cleaner sound, stronger headphone amplification, and wireless listening flexibility.

Supporting both Bluetooth and 3.5mm AUX wired input, the N3 functions as a portable headphone amplifier and desktop Bluetooth receiver, delivering rich, detailed, and low-distortion audio for headphones and in-ear monitors. Powered by the premium OPA1656 op-amp and supporting headphones up to 300Ω impedance, the N3 provides immersive HiFi sound in a lightweight CNC-machined aluminum body.

Perfect for portable music listening, commuting, desktop audio setups, and everyday wireless HiFi enjoyment.

Bluetooth & Wired Audio Connectivity

The N3 supports both wireless and wired audio input for flexible listening across different devices and environments.

Input Options:

• Bluetooth
• 3.5mm AUX Input

Output:

• 3.5mm Headphone Jack

This allows seamless compatibility with:

• Smartphones
• Tablets
• Laptops
• Portable music players
• Desktop audio systems
• Gaming devices

The dual connectivity design gives users the flexibility to switch between wireless convenience and wired HiFi playback.

Portable HiFi Sound with OPA1656 Op-Amp

At the core of the N3 is the premium OPA1656 operational amplifier engineered for clean, detailed, and low-distortion audio reproduction.

Audio Performance Benefits:

• Clear vocal reproduction
• Enhanced instrument separation
• Low distortion playback
• Improved sound dynamics
• Accurate audio detail retrieval

Crafted by experienced audio engineers, the N3 delivers:

• Rich musical texture
• Balanced tonal response
• Smooth treble presentation
• Tight bass performance
• Immersive listening quality

Perfect for:

• HiFi music streaming
• Portable audiophile listening
• Everyday headphone use
• Desktop music playback

Supports Headphones up to 300Ω

The N3 provides sufficient power to drive a wide range of headphones and IEMs.

Headphone Compatibility:

• 16Ω–300Ω headphones

Output Performance:

• 138mW @ 32Ω
• 15mW @ 300Ω

Compatible with:

• Audiophile headphones
• Portable headphones
• Studio headphones
• In-ear monitors
• High-impedance headphones

The dedicated amplification stage improves:

• Volume headroom
• Bass control
• Sound clarity
• Dynamic range
• Listening immersion

Low Noise HiFi Audio Performance

The N3 is optimized for clean, low-noise portable audio playback.

Technical Audio Performance:

• THD: 0.001%
• SNR: 95dB
• Frequency Response: 20Hz–20kHz

This ensures:

• Minimal background noise
• Clean signal amplification
• Accurate sound reproduction
• Smooth listening experience

The isolated power supply design further improves audio stability and sound purity during portable use.

User-Friendly Portable Design

The N3 is designed for convenient everyday operation with practical hardware controls and compact portability.

User Features:

• Rotary volume wheel
• Gain switch
• Bass boost toggle
• Easy-access controls
• Compact pocket-friendly size

The physical volume wheel helps prevent accidental volume adjustments while improving control precision.

Bass Boost Function:

Enhance low-frequency response for:

• EDM
• Hip-hop
• Movies
• Gaming
• Bass-heavy music genres

Long Battery Life for Mobile Listening

The N3 is powered by a built-in 1200mAh rechargeable battery for extended portable use.

Battery Performance:

• Up to 10 hours playback time
• Stable portable operation
• Reliable daily listening

Perfect for:

• Daily commuting
• Travel
• Office listening
• Outdoor use
• Long music sessions

Premium CNC Aluminum Construction

The N3 features a precision CNC-machined aluminum alloy body that combines durability with premium aesthetics.

Build Features:

• CNC aluminum chassis
• Compact portable design
• Durable metal construction
• Premium tactile feel
• Elegant minimalist styling

The all-metal body improves:

• Durability
• Heat dissipation
• Long-term reliability
• Premium user experience

Technical Specifications

• Model: N3
• Product Type: Portable Bluetooth Headphone Amplifier
• Inputs:
  • Bluetooth
  • AUX
• Output:
  • 3.5mm Headphone Jack
• Op-Amp:
  • OPA1656
• Supported Headphone Impedance:
  • 16Ω–300Ω
• RMS Output Power:
  • 138mW @ 32Ω
  • 15mW @ 300Ω
• Frequency Response:
  • 20Hz–20kHz
• THD:
  • 0.001%
• Signal-to-Noise Ratio:
  • 95dB
• Bluetooth Codec:
  • SBC
• Battery:
  • 1200mAh
• Battery Life:
  • Up to 10 hours
• Power Supply:
  • 5V / 1A
• Dimensions:
  • 90 × 50 × 12mm
• Weight:
  • 300g

Key Features

• Portable Bluetooth headphone amplifier
• OPA1656 HiFi op-amp
• Bluetooth and AUX input support
• Supports 16Ω–300Ω headphones
• Up to 10-hour battery life
• Bass boost and gain controls
• CNC aluminum alloy body
• Low-noise HiFi sound
• Compact portable design
• Desktop and mobile compatibility