SMSL H300 Headphone Amplifier


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Less is more

Welcome to the world of high-fidelity audio with the SMSL H300 headphone amplifier. Stripped down to the essentials, it's an amplifier that does its job without any distracting bells and whistles. But don't let its simplicity fool you. This is an amplifier focused solely on delivering the best audio quality, devoid of unnecessary features that might complicate its use or affect sound quality.

Fully balanced with high power output

The H300 features a fully balanced design with a 4-way ultra-low distortion precision linear feedback circuit. Delivering a robust power output up to 10W at 16ohms and 5W at 32 ohms, the H300 is capable of driving a wide variety of headphones.

Low noise op amps in parallel

The magic of the H300's exceptional performance is in its op-amp configuration. Each channel employs 32 pieces of low-noise op-amps in parallel, reducing noise and enhancing overall sound quality.

Switchable gain control

Catering to all kinds of audio devices, the H300 features switchable gain control for high, medium, and low levels. The low gain setting is specifically optimized for IEMs.

Compact and stylish design

The H300's ultra-compact design is perfect for desktop headphone systems. Its vintage toggle switch design adds an appealing touch of style to its simplicity.

High-efficiency, low-noise power supply system

Equipped with a built-in high-efficiency, low-noise power supply system, the H300 ensures optimal performance, even during those long, immersive audio sessions.

Product highlights

  • JAS Hi-Res Certification
  • Fully balanced design
  • High power output
  • SNR up to 133dB
  • Distortion as low as 0.00006%
  • 64 pieces high-power op-amp 
  • Three-position gain control
  • Vintage toggle switch design
  • Preamp output 


  • Inputs: Balanced, unbalanced 
  • Headphone outputs: 4.4mm balanced, XLR 4-pin, 6.35mm unbalanced
  • Pre-outputs: balanced, unbalanced
  • Output power
    • 10W x2: 16Ω
    • 5W x2: 32Ω
  • SNR: 133dB
  • Dynamic range: 133dB
  • THD+N: -123dB, 0.00006%
  • Input impedance: 47kΩ
  • AMP output impedance: Near 0Ω
  • Pre-output impedance
    • Balanced: 44Ω
    • Unbalanced: 22Ω
  • Frequency response: 20Hz - 100kHz
  • Gain
    • Unbalanced: Low (-11.5dB), Middle (0dB), High (18.5dB)
    • Balanced: Low (-6dB), Middle (6dB), High (24.5dB)
  • Power consumption: <50W
  • Size: 8.2” x 1.5” x 7” (210 x 40 x 178mm)
  • Weight: 2.7lbs (2.1.23kg)

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