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SMSL H400 Hi-Res Headphone Amplifier high power output 600Ω Earphone AMP

SMSL H400 Hi-Res Headphone Amplifier high power output 600Ω Earphone AMP

Regular price £408.00 GBP
Regular price £408.00 GBP Sale price £408.00 GBP
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Input Method
Balanced, unbalanced

Earphone Output Method
4.4mm Balanced
XLR Balanced
6.35mm RCA

Preamp Output Method
Balanced, unbalanced

Output Power
16Ω: 15W x 2
32Ω: 7.5W x 2
150Ω: 2000mW x 2
300Ω: 1000mW x 2
600Ω: 550mW x 2

SNR (Signal-to-Noise Ratio)133dB
Dynamic Range133dB

THD+N (Total Harmonic Distortion + Noise)
-123dB, 0.00006% (1kHz, 32Ω)
Input Impedance 47kΩ
Headphone Output Impedance Almost close to 0Ω

Preamp Output Impedance
Balanced: 44Ω
Unbalanced: 220Ω

Frequency Response
20Hz - 100kHz (-0.5dB)

Balanced: Low (-5.8dB), Medium (6dB), High (20.4dB)
Unbalanced: Low (-11.8dB), Medium (0dB), High (14.4dB)

Power Consumption (EN60065) <50W
Standby Power Consumption <0.5W
Dimensions 254x46x189mm (WxHxD)
Weight 2.03kg / 4.47lbs

SMSL H400 Hi-Res Headphone Amplifier

The SMSL H400 is a high-resolution headphone amplifier designed to deliver exceptional audio performance with high power output, making it suitable for a wide range of headphones. With its ultra-compact design and high-end preamp functionality, the H400 is an ideal choice for desktop headphone systems.

Key Features

  • Output power: 15W at 16Ω, 7.5W at 32Ω, 2000mW at 150Ω, 1000mW at 300Ω, 550mW at 600Ω
  • Hi-End preamp design: Can be used as a Hi-End preamp
  • Ultra-compact design: Perfect for desktop setups
  • Gain control: Switchable high, medium, and low gain settings
  • Wireless control: Comes with a full-function remote control
  • Fully balanced discrete component design
  • Ultra-high power output
  • Electronic relay volume control: Eliminates channel deviations
  • Built-in high efficiency and low noise power supply system
  • Beautiful design: Silver shining quality aluminum with fully laminated color IPS display and tempered glass

Performance and Specifications

Output Power

The SMSL H400 delivers up to 15W of power at 16Ω and 7.5W at 32Ω, providing ample power for a wide variety of headphones.

Gain Control

With switchable gain control, you can easily adjust the gain to suit your listening preferences:

  • Unbalanced interface: Low: -11.8dB, Medium: 0dB, High: 14.4dB
  • Balanced interface: Low: -5.8dB, Medium: 6dB, High: 20.4dB

Wireless Control

The H400 is equipped with a full-function remote control, allowing for convenient operation and control from a distance. The remote control has a good hand feeling and better quality, making it easy to adjust settings as needed.

Design and Build

The SMSL H400 features a fully balanced discrete component design with a beautiful silver shining quality aluminum body. The device uses electronic relays to control volume, eliminating channel deviations. It also has a fully laminated color IPS display with tempered glass for enhanced durability and aesthetic appeal.

Power Supply

The built-in high efficiency and low noise power supply system ensures reliable performance with minimal noise interference, making the H400 an excellent choice for high-fidelity audio playback.

In the Box

  • SMSL H400 Hi-Res Headphone Amplifier
  • Power cord
  • Remote control
  • User manual
SMSL H400 Hi-Res Headphone Amplifier 16Ω/15W*2 32Ω/7.5W*2 Earphone AMP
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What's in the Box?

SMSL H400 Hi-Res Headphone Amplifier
Power cord
Remote control
User manual

Shipping & Returns

  • Free Standard full searchable Shipping
  • DDP(Delivered Duty Paid) Services, No payment on receiption
  • Free 7-Day Return Policy!

Shipping Fees

Worldwide Free Shipping on Hificat, Please allow 1-3 business days for conduct Quality Control in order to ensure the products quality.

In the event that a shipment is refused delivery by the recipient, is undeliverable, or is returned to sender, Hificat will process a refund to the original payment method used.

If a customer would like the order reshipped, they’ll be charged a reshipment fee. Customers may also be subject to a restocking fee of up to 20 percent of the product cost.


Which Couriers To Use?

We collaborate with these courier companies:
Standard Shipping: Yanwen Express
Express Shipping(over $500 can be free): DHL Express, FedEx and SF Express

Hificat has extensive global logistics experience to ensure quality logistics services to consumers.

HiFiCat offers consumers different shipping, depending on the country, a choice of different shipping methods.


Estimated Delivery Time

1. France, Germany, UK, Italy, Spain, USA.

All taxes and duties are prepaid to the carrier by HiFiCat prior to shipping, so there are no taxes or duties to pay when you receive it. 6-10 days to arrive.

Tracking Example



United Kingdom:



United States:

2.EU Country:Filand, Poland, Estonia, Norway, Switzerland, Greece, Sweden, Israel, Czech Republic, Slovenia, Slovakia, Denmark, Netherlands, Latvia, Croatia, Austria, Hungary, Belgium, Bulgaria, Romania, Ireland, Malta, Iceland, Serbia and so on.

All taxes and duties are prepaid to the carrier by HiFiCat prior to shipping, so there are no taxes or duties to pay when you receive it. 10-15 days to arrive.









Czech Republic:


















Russian Federation

3.South America:Peru, Brazil, Chile



South Africa:


New Zealand:


5.Canada By Canada Post, about 2 weeks.
6. Asia:
Japan By Japan Sagawa Global Transportation. About 7 days.
Thailand By jt express. About 5-7days.
Malaysia by jtexpress.My  About 5-7days.
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