S.M.S.L DO400 Fully Balanced Audio DAC and Headphone Amplifier
The S.M.S.L DO400 represents the pinnacle of modern desktop audio engineering, combining a state-of-the-art flagship ESS DAC chip with a powerful built-in headphone amplifier. Designed for discerning audiophiles and high-end setups, it delivers master-grade resolution, ultra-low distortion, and massive driving power to bring out the absolute best in any headphones or speakers.
Flagship ES9039MSPRO DAC Architecture
At the heart of the DO400 is ESS Technology’s premier flagship ES9039MSPRO digital-to-analog conversion chip, featuring built-in MQA hardware decoding. This advanced architecture drastically reduces noise interference and jitter, resulting in an exceptionally pure, transparent, and lifelike audio reproduction with pinpoint imaging and rich textural detail.
Massive Headphone Driving Power with Versatile Outputs
Equipped with a high-performance 4-way fully balanced headphone amplifier circuit, the DO400 delivers an impressive output power of up to 6000mW into 16 ohms. It features a comprehensive array of headphone jacks—including 4.4mm balanced, 6.35mm single-ended, and 4-pin XLR balanced outputs—alongside professional XLR and RCA line outputs to easily drive everything from sensitive IEMs to demanding planar magnetic headphones.
High-Resolution Audio and Complete MQA Decoding
The DO400 provides comprehensive hardware support for the industry's most demanding digital formats. It natively decodes PCM audio up to 32-bit/768kHz and Direct Stream Digital up to DSD512 via USB and I2S inputs. Furthermore, full MQA and MQA-CD decoding capabilities allow listeners to stream or play back studio master recordings precisely as the artist intended.
High-Performance Qualcomm Bluetooth Connectivity
Equipped with an advanced Qualcomm Bluetooth chipset supporting Bluetooth 5.1, the DO400 offers high-definition wireless streaming protocols including LDAC (24-bit/96kHz), aptX HD, aptX, AAC, and SBC. This ensures users can enjoy seamless, high-resolution wireless audio from smartphones, tablets, or laptops without sacrificing sonic fidelity.
Premium CNC Aluminum Construction
The chassis is precision-milled from a solid block of high-grade aluminum using advanced CNC machining and features a full-laminated tempered glass color IPS display. This robust enclosure not only offers a sleek, modern aesthetic but also provides exceptional structural rigidity and superior shielding against external electromagnetic interference.
Comprehensive Digital and Analog Connectivity
Designed as the ultimate command center for desktop audio, the DO400 offers a full array of inputs and outputs to integrate effortlessly into any home audio or headphone system:
Inputs: USB, Optical, Coaxial, Bluetooth, AES/EBU, and I2S.
Outputs: Balanced XLR line-out, Unbalanced RCA line-out, 4.4mm balanced headphone jack, 6.35mm single-ended headphone jack, and 4-pin XLR balanced headphone jack.
About SMSL
Foshan ShuangMuSanLin Electronics Co., Ltd. (SMSL) is an established global manufacturer specializing in high-fidelity desktop audio. Known for digital-to-analog converters, balanced headphone amplifiers, and power amplifiers, SMSL has built a worldwide reputation for combining rigorous bench performance, clean industrial design, and exceptional value across various price tiers.
Technical Specifications
Input: USB / Optical / Coaxial / Bluetooth / AES / I2S
Line Output: XLR / RCA
Headphone Output: 4.4mm balanced / 6.35mm single-ended / 4-pin XLR balanced
Headphone Output Power: 6000mW x2 (16Ω) / 3000mW x2 (32Ω)
THD+N: 0.00005% (-123dB)
Bluetooth Support: LDAC, aptX HD, aptX, SBC, AAC
USB Sampling Rate: PCM up to 32-bit/768kHz, DSD up to DSD512
Display: Tempered glass full-laminated color IPS screen
Q&A
What DAC chip does the SMSL DO400 use?
It uses flagship ESS Technology ES9039MSPRO DAC chip with built-in MQA decoding.
What is the headphone output power of the DO400?
It delivers up to 6000mW per channel into 16 ohms (3000mW into 32 ohms).
What headphone jacks are available on the unit?
It features 4.4mm balanced, 6.35mm single-ended, and 4-pin XLR balanced headphone outputs.
Does the DO400 support high-definition Bluetooth streaming?
Yes, it features a high-end Qualcomm Bluetooth chip supporting LDAC, aptX HD, aptX, AAC, and SBC.
What are the maximum sampling rates supported via USB?
It supports PCM up to 32-bit/768kHz and native DSD up to DSD512.
