AI-generated product photo — not official manufacturer imagery.
About the DO300 EX
The SMSL DO300 EX (also styled DO300EX) is a desktop balanced DAC, preamplifier, and headphone amplifier. It uses AKM’s two-chip flagship conversion platform—an AK4191 digital delta-sigma modulator/filter paired with an AK4499EX DAC—along with a 3rd-generation 16-core XMOS XU316 USB interface. It accepts USB, optical, coaxial, I²S-over-HDMI, and Bluetooth sources; provides balanced XLR and single-ended RCA line outputs; and includes 4.4 mm balanced and 6.35 mm single-ended headphone outputs. Features include MQA/MQA-CD decoding, an IPS color display, remote control, programmable DAC/filter options, a second PLL/CK-03 clock-processing system for SPDIF jitter reduction, and Hi-Res Audio certification. It is a DAC/headphone-amp product rather than a standalone power amplifier, so speaker sensitivity, speaker impedance, amplifier damping factor, and speaker power-handling ratings do not apply.
Specifications
Digital Audio
DAC capabilities and digital audio processing
- Bit Depth
- 32-bit
- Max Sample Rate
- 768 kHz
- DSD Support
- DSD512
- MQA Support
- Yes
- DAC Chip
- AKM AK4191 + AK4499EX
Analog Output
Analog signal output specifications
- THD
- 0.000%
- SNR
- 132 dB
- Output Voltage
- 2.5V RMS
- Output Impedance
- 100Ω
- Max Output Voltage
- 5.2V RMS
Connectivity
Input and output connections
- Bluetooth
- Yes
- Bluetooth Codecs
- SBC, AAC, aptX, aptX HD, LDAC
- Wi-Fi
- No
- Ethernet
- No
- Digital Inputs
- USB, optical, coaxial, AES, I2S/HDMI
- Analog Inputs
- RCA, XLR, 4.4mm balanced headphone, 6.35mm single-ended headphone
- Analog Outputs
- RCA, XLR, 4.4mm balanced headphone, 6.35mm single-ended headphone
Streaming Services
Supported streaming platforms and protocols
- AirPlay
- No
- Chromecast
- No
- Roon Ready
- No
- Spotify Connect
- No
- TIDAL Connect
- No
Physical Dimensions
Size, weight, and appearance
- Dimensions
- 222 × 39 × 207 mm (W × H × D)
- Weight
- 1.54 kg (3 lbs)
Never published
- Power Specifications — the maker never published this. Checked 15 sources on 9 Sept 2026
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions