SMSL D400 EX Audio System User Manual

This manual provides installation, safety, and operating instructions for the SMSL D400 EX high-resolution audio system, including remote control usage and…

Brand: S.M.S.L
Category: Other Electronics
Document type: User Manual
Language: Chinese
Pages: 22
File format: PDF
File size: 20.3 MB
Published: 13 October, 2026
Updated: 13 October, 2026
MD5 checksum: 12226A01C4DC0B5DD4859395E9D9B592
PDF: SMSL D400 EX Audio System User Manual PDF

About this manual

The SMSL D400 EX is a high-resolution audio system featuring MQA decoding, XMOS XU-316 processing, and dual AK4499EX DAC chips. It supports various digital inputs including USB, optical, coaxial, AES, I2S, and Bluetooth with LDAC support. The unit includes a color IPS display and a full-function remote control. This manual is written in Chinese.

What's inside

Safety Precautions
Warranty Terms
Product Features
Technical Specifications
Remote Control Operation
Component Introduction
Input/Output Functions
Sound Color Settings
I2S DSD Channel Settings
Display Settings

Specifications

THD+N	0.000067%(-123.5dB) / 0.000053%(-125.5dB)
Dynamic Range	133dB (Balanced) / 128dB (Unbalanced)
Signal-to-Noise Ratio	133dB
USB Transmission	Asynchronous
Bluetooth Codec	LDAC (24bit/96kHz)
Dimensions	240x188x46 mm
Weight	1.85kg/4.08 lb

Frequently asked questions

What is the warranty period for the SMSL D400 EX?

The product is covered by a free warranty for one year under normal usage conditions.

How do I connect the device via Bluetooth?

Switch the input source to Bluetooth, enable Bluetooth on your phone, search for "SMSL D400 EX", and click to pair.

What happens if I long press the middle button of the knob during Bluetooth input?

The system will only reset the Bluetooth pairing status.

Can I use the I2S input for DSD audio?

Yes, the I2S input supports DSD transmission, and you can adjust the DSD channel settings if the left and right channels are incorrect.

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