SMSL SU-1 MQA MQA-CD Audio Decoder AK4493S XU316 768kHz/32Bit DSD512 Hi-Res DAC
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AI Verdict
This is a dead-simple, budget DAC for desktop audio setups that delivers shockingly clean sound without costing a fortune.
The SU-1 is a strong fit for its intended purpose: providing high-fidelity digital-to-analog conversion at a minimal cost. It uses quality components like the AK4493S DAC chip and XU316 USB processor to deliver clean, neutral sound that punches well above its price. It's for people who already have an amplifier and speakers and just need a pure, no-frills DAC.
If you need a physical volume knob or a headphone output, look for a DAC/Amp combo unit instead of a standalone DAC.
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Pros
- Features the AKM AK4493S chip, achieving a very low distortion of 0.00013%.
- Supports MQA and MQA-CD decoding, a rare feature at this price point.
- Offers USB, Coaxial, and Optical inputs, providing flexible connection options for PCs, streamers, and CD players.
- Compact and sturdy CNC-machined aluminum housing fits easily on any desk.
- Noticeably improves clarity and detail compared to onboard sound cards or older DACs.
Cons
- No physical volume control; volume must be adjusted at the source or amplifier.
- Does not include a 5V USB power adapter in the box, which is required for optical/coaxial use.
- Lacks a dedicated power button and stays on unless unplugged or the source is off.
- Some users report the front panel LEDs are excessively bright.
- Only has single-ended RCA outputs, no balanced option available.
Dimension Scores
Delivers a neutral, clean, and transparent sound with a very low distortion of 0.00013% thanks to its AK4493S DAC chip.
The unit has a fixed-level line-out and completely lacks any onboard volume control, which is a significant functional omission.
Provides a solid trio of USB, Optical, and Coaxial inputs but lacks any wireless options like Bluetooth or balanced XLR outputs.
Features a sturdy and compact CNC-machined aluminum body that feels more premium than its price suggests.
Best For
- Upgrading from a PC's built-in sound card to power speakers or a headphone amp.
- A first desktop audio stack for new audiophiles on a tight budget.
- Connecting a TV's optical output to a stereo amplifier for better sound quality.
- Adding a modern DAC to an older CD player with a coaxial or optical output.
Not Recommended For
- Users who want an all-in-one unit with a built-in headphone amp and volume knob.
- Anyone needing Bluetooth connectivity for wireless streaming.
- Setups that require balanced XLR outputs to connect to professional gear or high-end amps.
Watch Out For
- You must supply your own 5V USB power adapter if you're not using the USB input for audio from a computer.
- When connected to a TV via optical, you must set the TV's audio output to PCM, otherwise you'll just get noise.
- Some users have noticed popping sounds when switching tracks if the USB is powered by a noisy PC port; a separate, clean power supply can fix this.
- There is no auto-off or sleep function, so the unit remains powered on 24/7 unless you manually unplug it.
Full Specifications
| ASIN | B0C1Y7C9HH |
| Brand | Fanmusic |
| Material | Copper |
| Item Weight | 6.9 ounces |
| Manufacturer | SMSL |
| Mounting Type | Coaxial,Plug Mount |
| Interface Type | Coaxial, USB |
| Number of Pins | 8 |
| Item model number | SU-1 |
| Number of Channels | 2 |
| Product Dimensions | 3.78"L x 3.07"W |
What Buyers Say
The most common reaction to plugging in the SMSL SU-1 is surprise at how much it improves sound quality for something so cheap. Many users describe it as taking a blanket off their speakers, revealing a level of clarity and detail they didn't have with their computer's onboard audio. It's a very neutral and sometimes clinical-sounding DAC, focusing on accuracy. The main annoyances aren't about sound but about usability: you have to bring your own 5V power supply for non-USB sources, there's no volume knob, and the blue indicator LED can be distractingly bright.
“First impression: is that my stereo system???? Much cleaner and controlled sound, much better Soundstage - in essence: sounded as I would have spent thousands of $.”
Common Praise
- Sounds like a thick blanket has been removed from my speakers.
- Incredible clarity and imaging for the price.
- The CNC-machined aluminum case feels sturdy and well-built.
- Great input flexibility with USB, Optical, and Coaxial.
- MQA decoding works perfectly and is a rare find in a sub-$100 DAC.
- Noticeable improvement over the DACs in streamers like the Wiim Mini/Pro.
Common Complaints
- Does not come with a 5V power adapter in the box.
- The absence of a physical volume control knob is inconvenient.
- The front panel LEDs are too bright for a dark room.
- Some users experience pops or clicks when connected to a noisy PC USB port.
- Only has single-ended RCA outputs, no balanced option.
- Input selection requires cycling through with a single button.
Ownership Tips
- You'll quickly get used to leaving it on all the time since there's no auto-off.
- If you hear any hum or buzz when connected to a PC, try powering it with a separate, high-quality phone charger instead of the PC's USB port.
- The unit is so small and light you can use adhesive strips to mount it out of sight behind a monitor or desk.
- Some users find the sound a bit 'clinical' or bright, especially in the highs, which can be an issue in an already bright-sounding system.
Frequently Asked Questions
Does the SMSL SU-1 come with a power supply?
No, it does not include a 5V power adapter. It comes with a USB-A to USB-C cable and can be powered by your computer when using the USB input.
Can I connect headphones directly to the SU-1?
No, you cannot. The SU-1 is only a DAC and has no built-in headphone amplifier; you need to connect it to a separate amp.
Can I control the volume with my computer?
Yes, you can control the volume through your operating system (like Windows or macOS) when connected via USB. The DAC itself has no volume control.
Do I need to install drivers to use it with my computer?
For Windows 10/11, a driver is required to enable high-resolution playback. macOS and Linux do not require any drivers.
Why am I only getting noise when I connect it to my TV?
Your TV is likely sending a Dolby or DTS signal. You need to go into your TV's audio settings and change the digital audio output format to PCM.
Is there a power switch?
There is a button on the front that cycles through inputs with a short press and can turn the device on/off with a long press. However, it doesn't have an auto-off feature.
Buying Guide
This is a 'pure DAC'. It only does one thing: convert a digital signal (from your PC, TV, or streamer) to an analog one. It has no volume control, no headphone jack, and no Bluetooth. You need to already own an amplifier or a set of powered speakers to use it. Think of it as a specialized component upgrade, not an all-in-one audio solution.
AK4493S DAC Chip
This is the 'brain' that turns digital 1s and 0s into the sound waves you hear. The AK4493S is a modern, high-quality chip known for producing a very clean, accurate, and low-distortion sound, which is impressive to find in a device this cheap.
USB/Optical/Coaxial Inputs
This gives you options. USB is best for a computer. Optical is what you'll use to connect a TV or PlayStation. Coaxial is common on older or high-end CD players and streamers. Having all three makes the SU-1 very versatile.
MQA Support
MQA is a specific audio format used by streaming services like Tidal HiFi Plus to deliver high-resolution audio. If you use Tidal, this DAC can fully 'unfold' those files to give you the highest possible quality. It's a premium feature for a budget price.
Alternatives
If this is too basic, search for a 'DAC/Amp combo' which will add a headphone output and a volume knob. If you need wireless, look for a 'Bluetooth DAC'.
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