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S.M.S.L SU-1 MQA MQA-CD Audio Decoder AK4493S XU316 768kHz/32Bit DSD512 Hi-Res DAC

4.4 out of 5 stars 1,197 ratings

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Purchase options and add-ons

Brand Fanmusic
Number of pins 6
Interface type USB, Optical, Coaxial
Number of channels 2
Product Dimensions 9.6L x 7.8W Centimetres
Manufacturer S.M.S.L

Product details

  • Product Dimensions ‏ : ‎ 9 x 7.8 x 2.7 cm; 195 g
  • Date First Available ‏ : ‎ May 10 2023
  • Manufacturer ‏ : ‎ S.M.S.L
  • ASIN ‏ : ‎ B0C1Y7C9HH
  • Item model number ‏ : ‎ SU-1
  • Customer Reviews:
    4.4 out of 5 stars 1,197 ratings
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Product description

Specification:
Input: USB/Optical/Coaxial
Output level:2.0Vrms
THD+N:0.00013%(-117dB)
Dynamic range:121dB
SNR:121dB
USB transmission:Asynchronous transmission
USB compatibility: Windows 7/8/8.1/10 /11 Mac 0S X10.6 above、Linux
Bit depth:
USB:1Bit-32Bit
Optical/coaxial:6Bit-24Bit
Sampling rate: USB PCM 44.1KHz-768KHz/DSD 2.8224-22.5792MHz
MQA:384kHz
Power consumption<5W
Standby power<0.1W
Size: 96 x 27 x 78mm (WxHxD)
Weight:195g/0.43lbs

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Customer reviews

4.4 out of 5 stars
1,197 global ratings

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Customers say

Customers like the sound quality, performance, and build quality of the electronic signal converter. They mention it delivers great sound, is easy to set up, and has user-selectable coaxial and optical inputs. Some also say it's a good product for the price.

52 customers mention "Sound quality"39 positive13 negative

Customers like the sound quality of the electronic signal converter. They mention the music files come alive and almost sound 3 dimensional. Customers also say the DVD optical into dac sounds mint, with zero hiss even with volume up to the max. They also appreciate the user-selectable coaxial and optical inputs.

"The design, in its simplicity, delivers great sound; one mention is the output is really high, 2.0 volts; in my configuration I used a passive..." Read more

"...I was very surprised with it. Mid performance is great. Soundstage is very wide. Bass performance is really good not shallow and dry...." Read more

"...Sound is good same as with Ifi products but little different functionality. Depends what your needs are. Happy listening !" Read more

"...They both sound great. I don't fault the SMSL unit for this, maybe my Blu-Ray player has a really good internal DAC." Read more

30 customers mention "Performance"30 positive0 negative

Customers are satisfied with the performance of the electronic signal converter. They mention it's excellent, flawless in operation, and the result is satisfactory. Some say it works well initially via USB port.

"Performance is TOP quality both in USB and Optical I have not tried the coaxial output......" Read more

"...I was very surprised with it. Mid performance is great. Soundstage is very wide. Bass performance is really good not shallow and dry...." Read more

"Working as it should with great sound for little money !..." Read more

"Excellent DAC for the price. Added this to my CD player and what a difference in sound quality !! Good job SMSL." Read more

23 customers mention "Build quality"17 positive6 negative

Customers are satisfied with the build quality of the electronic signal converter. They mention it's a solid performer, strong, and deep base. Some say it's the best Dac and super affordable.

"...I bought this for home use to my Harmon Kardon amp it is amazing quality don`t buy the over priced DAC`s this will make the difference you are..." Read more

"Built quality is very good full aluminum casing and RCA out are gold plated. Yes it comes only with a USB C cable...." Read more

"Not satisfied with the product quality and performance. It stops playing sound in between." Read more

"This manufacturer of a DAC I believe to be extremely high-quality for an extremely great price. I highly recommend it to anybody...." Read more

7 customers mention "Ease of use"7 positive0 negative

Customers like the ease of use of the electronic signal converter. They mention it's easy to set up and flawless in operation with digital input. Some say it takes 5 minutes to hookup and is non-fatiguing.

"The design, in its simplicity, delivers great sound; one mention is the output is really high, 2.0 volts; in my configuration I used a passive..." Read more

"Energetic, spacious, non-fatiguing...." Read more

"Took 5 Min to hookup. Works perfectly. Could not believe the improved sound quality. Worth every penny! Should have bought sooner." Read more

"...Arrived quickly and was well packaged. Easy to set up and flawless in operation with digital input from Cambridge CXC CD player and WiiM Pro..." Read more

3 customers mention "Input options"3 positive0 negative

Customers like the input options of the electronic signal converter. They mention it features user-selectable coaxial and optical inputs.

"...It's very small for a DAC that has USB, Optical, and Coaxial inputs...." Read more

"...Zero hiss even with volume up to max, features user select-able coaxial and optical inputs. Cons: no included power adapter and no remote option...." Read more

"Sounds great, good set of inputs, and seems well built. Handles DSD files flawlessly. Terrific unit for the price. I can't ask for more than this." Read more

AKM PCM and High Output
5 out of 5 stars
AKM PCM and High Output
The design, in its simplicity, delivers great sound; one mention is the output is really high, 2.0 volts; in my configuration I used a passive volume control to control the output. The AKM chip delivers really clean and detailed sounds; excellent. For the package's great value and reasonable price.
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Top reviews from Canada

  • Reviewed in Canada on March 15, 2025
    Verified Purchase
    Performance is TOP quality both in USB and Optical I have not tried the coaxial output...
    I bought this for home use to my Harmon Kardon amp it is amazing quality don`t buy the over priced DAC`s this will make the difference you are looking for.

    This is pure and simple less chance of noise from LCD screens and other knobs or buttons.

    When using optical you need to power the DAC from the USB C port.

    Not sure about Coaxial port.

    USB C port works in Windows 11 just plug into your computer and it gets power and plays your audio all from that port.

    The web site stating it works with android, they should state Tablets only as it will not work with cellphones unless you have external power supply using USB C Splitter, Dual USB C Headphone and Charger Adapter,2-in-1

    The single end to the dac, Then you will need the Fosi Audio DS1 supplied USB C cable to connect the splitter to your cell I've tried other quality 6inch usbc cable but it will not connect to cellphone only works with shorter cable that came with fosi ds1 dac. I even tried a smaller adapter with no cable just USB C males ends and still it will not work only the Fosi Audio DS1 cable will work...

    Another warning is you have no volume control when using your cellphone so you need to have it playing through something with volume control.... I know this as I used a RCA to AUX cable to use it with headphones so only full volume that way !!!

    I contacted SMSL customer support on Facebook requesting firmware to be updated but they are not helpful at all very ignorant. I just found the actual link for customer service on there web site and requested a firmware update..

    Without the splitter and external power supply your cell will state what is below.

    The SMSL web site states it works with android but when I plug the USB C from my Galaxy A52 without external power supply the screen states very clearly quote :
    Android system
    High Power USB device connected
    Cannot access to this device. Connected device needs external power supply.

    I also bought the Fosi Audio DS1 USB-C DAC for my cellphone it is also very high quality don`t waste your money on more expensive portable DAC`s both DAC`s will impress.
    One person found this helpful
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  • Reviewed in Canada on June 21, 2025
    Verified Purchase
    works great
  • Reviewed in Canada on April 14, 2025
    Verified Purchase
    The design, in its simplicity, delivers great sound; one mention is the output is really high, 2.0 volts; in my configuration I used a passive volume control to control the output. The AKM chip delivers really clean and detailed sounds; excellent. For the package's great value and reasonable price.
    Customer image
    5.0 out of 5 stars
    AKM PCM and High Output

    Reviewed in Canada on April 14, 2025
    The design, in its simplicity, delivers great sound; one mention is the output is really high, 2.0 volts; in my configuration I used a passive volume control to control the output. The AKM chip delivers really clean and detailed sounds; excellent. For the package's great value and reasonable price.
    Images in this review
    Customer image
  • Reviewed in Canada on July 28, 2023
    Verified Purchase
    Built quality is very good full aluminum casing and RCA out are gold plated. Yes it comes only with a USB C cable. No surprise it doesn’t comes with a USB power adaptor. At this price don’t expect it please. I paired mine with a linear power supply Topping P50 5V 1A plugged with an Audioquest NRGZ3 power cable to get the performance of this dac. It would be better with a 5V 2.5A linear power supply to getter better dynamics. I only use the optical & coaxial and will NEVER use the USB as input because of PC that will always generate noise. The sound quality from both optical & coaxial are very airy and has layers. You can pinpoint the singer in the middle of the two speakers. It doesn’t play ONLY in the middle but it images the true source of vocal and images the right location of the singer. That’s the beauty of this dac is it’s depth that it provides and takes it to another level. I was very surprised with it. Mid performance is great. Soundstage is very wide. Bass performance is really good not shallow and dry. At this price point you’ll fool your audio enthusiast friends. I could not believe my ears when I first plugged it to my main system and it is here to stay. Give it some time to settle Never switch it off. My conclusion is if you intend to use it with a cheap power supply you won’t get the best out of it. Get at least a linear power supply 5v 2.5A to unleash the full dynamics of this dac. At this price point and the overall performance this dac just sets the bar very high!
    17 people found this helpful
    Report
  • Reviewed in Canada on June 2, 2025
    Verified Purchase
    Audio starting displaying intermittent buzzing/interference issues around the 1 year mark. I attributed the issues to a bad audio cable/connection at the time. Then after 18 months of use the audio started to cut out several times a week (which could be fixed by cycling through different inputs before coming back to the original source) and show other odd issues like playing a Loud noise before stopping. A quick seasch online seems to show other people having the same durability issues. After I removed the DAC out of the audio chain all the problems went away. My setup includes ELAC reference speakers and Anthem A2 amp.
  • Reviewed in Canada on November 15, 2024
    Verified Purchase
    Working as it should with great sound for little money !
    I am using it to play all kind of files from PC using downloaded from SMSL website ASIO driver.
    Flac, DSD,MQA etc.
    Also I am using optical input to direct sound from Sony Blue-ray player for 2 channel stereo CDs and SACDs to stereo amp. ( Sony doesn't have good sounding dac built in and sounding thin compare to SU-1)
    I tried coaxial and it is working too without any problems.
    I like that you can switch this dac on and of with multifunction one big button on the front when not using.
    I have two different iFi Zen Dacs and they stay on all the time unless you disconnect cable which is inconvenient.
    Sound is good same as with Ifi products but little different functionality.
    Depends what your needs are.
    Happy listening !
  • Reviewed in Canada on April 30, 2025
    Verified Purchase
    I play music CDs on a 13 year-old Sony Blu-Ray player. I purchased the SMSL unit because of the hype and a fear of missing out (FOMO). In A-B comparisons between the RCA outputs on the Blu-Ray player and the digital coaxial output routed through the SMSL unit, I hear no difference across various CDs and genres of music. They both sound great. I don't fault the SMSL unit for this, maybe my Blu-Ray player has a really good internal DAC.
    One person found this helpful
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  • Reviewed in Canada on April 5, 2025
    Verified Purchase
    Excellent DAC for the price. Added this to my CD player and what a difference in sound quality !!
    Good job SMSL.

Top reviews from other countries

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  • Blackleopard75
    5.0 out of 5 stars Calidad a un precio inmejorable
    Reviewed in Spain on April 14, 2025
    Verified Purchase
    Después de un tiempo buscando información sobre Dac's encontré este y que gran suerte! Con una pequeña inversión optienes un Dac que ofrece una calidad de sonido que soprende por lo pequeño que es el aparatito, eso sí muy bien construido y decodifica la senyal digital y la transforma a analógica por salidas rca a tu amplificador, previo, receptor AV etc. Actualizando y dando una calidad de sonido increíble, con una nitidez y claridad matices sorprendente superando a otros 2 o 3 veces más caros, con un coste inferior pero no en calidad de sonido i acabados.

    Sí buscas un Dac sin tener que invertir mucho dinero pero con una calidad que sorprende este es tu Dac, no lo dudes. Tu música en streaming mejorará gratamente y solo desde tu smartphone, tablet, pc, eso sí que dispongan de transmisión de archivos de audio a través del Puerto usb-c, yo utilizo un Xioami Mi 9TPro y funciona perfectamente ya que envía audio y alimentación al Dac sin ningún problema, también tengo un Poco X3y perfecto pero tengo un Xiaomi Redmi note 11s y no lo puedo usar hasta el momento, no tengo ni idea porque no alimenta este Dac yo uso la entrada usb-c del Dac, que también es Puerto de alimentación de este para darle alimentación eléctrica tienes que usar un cargador de móvil, yo en mi caso cuando no lo uso a través de mi smartphone como no tengo toma de corriente eléctrica cercana uso una Powerbank y no me da ningún problema funciona perfectamente. También lo puedes usar a través de sus entradas digitales coaxial o óptica como Dac externo de un CD, DVD, streamer mejorando su calidad de sonido, yo lo he conectado con la entrada coaxial con mí CD Pioneer PDR-W839 Multi-CD Changer / CD Recorder y la mejora es notable, igualando a mi CD de referéncia dedicado el Marantz cd-48.

    En conclusión, por el coste que tiene y la calidad que ofrece no tengo dudas que es una gran compra este Dac, es pequeño pero matón.
    Customer image
    Blackleopard75
    5.0 out of 5 stars
    Calidad a un precio inmejorable

    Reviewed in Spain on April 14, 2025
    Después de un tiempo buscando información sobre Dac's encontré este y que gran suerte! Con una pequeña inversión optienes un Dac que ofrece una calidad de sonido que soprende por lo pequeño que es el aparatito, eso sí muy bien construido y decodifica la senyal digital y la transforma a analógica por salidas rca a tu amplificador, previo, receptor AV etc. Actualizando y dando una calidad de sonido increíble, con una nitidez y claridad matices sorprendente superando a otros 2 o 3 veces más caros, con un coste inferior pero no en calidad de sonido i acabados.

    Sí buscas un Dac sin tener que invertir mucho dinero pero con una calidad que sorprende este es tu Dac, no lo dudes. Tu música en streaming mejorará gratamente y solo desde tu smartphone, tablet, pc, eso sí que dispongan de transmisión de archivos de audio a través del Puerto usb-c, yo utilizo un Xioami Mi 9TPro y funciona perfectamente ya que envía audio y alimentación al Dac sin ningún problema, también tengo un Poco X3y perfecto pero tengo un Xiaomi Redmi note 11s y no lo puedo usar hasta el momento, no tengo ni idea porque no alimenta este Dac yo uso la entrada usb-c del Dac, que también es Puerto de alimentación de este para darle alimentación eléctrica tienes que usar un cargador de móvil, yo en mi caso cuando no lo uso a través de mi smartphone como no tengo toma de corriente eléctrica cercana uso una Powerbank y no me da ningún problema funciona perfectamente. También lo puedes usar a través de sus entradas digitales coaxial o óptica como Dac externo de un CD, DVD, streamer mejorando su calidad de sonido, yo lo he conectado con la entrada coaxial con mí CD Pioneer PDR-W839 Multi-CD Changer / CD Recorder y la mejora es notable, igualando a mi CD de referéncia dedicado el Marantz cd-48.

    En conclusión, por el coste que tiene y la calidad que ofrece no tengo dudas que es una gran compra este Dac, es pequeño pero matón.
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  • Patryk
    5.0 out of 5 stars Świetny DAC, idealny do Wiim Mini
    Reviewed in Poland on January 7, 2025
    Verified Purchase
    Działa idealnie z Wiim Mini
  • Paris, France
    5.0 out of 5 stars Excellent, rapport qualité prix imbattable
    Reviewed in France on May 31, 2025
    Verified Purchase
    Très bon. Bons timbres, très dynamique et clair. Bonne profondeur de scène sonore. Il a remplacé un Topping E30 et est nettement meilleur. L'avantage est qu'il n'y a pas de filtres, ni de suréchantillonnage avec une lecture CD. Comme on dit en anglais, "Less is More". Il a de bonnes basses, bien tenues, mais pas extra profondes. Il manque un peu de medium. J'ai essayé ensuite le D6s qui avait un son dur dans les aigues et artificiel sur mon installation. Donc, je garde le SU-1, qui est imbattable en rapport qualité prix. Il faut lui associer une bonne alimentation linéaire et de bons câbles pour en tirer le maximum. La puce AK produit des sons très naturels. Je n'ai pas du tout aimé le son de la puce ESS sur le D6s.
  • Maurizio
    5.0 out of 5 stars Vale i soldi spesi
    Reviewed in Italy on May 19, 2025
    Verified Purchase
    Buon suono, molto dettagliato
  • Jorge E. Palma Perez
    5.0 out of 5 stars WOW QUE BIEN SUENA ESTA PEQUEÑA MARAVILLA DE DAC
    Reviewed in Mexico on May 3, 2025
    Verified Purchase
    Después de ver muchas reseñas muy positivas de youtubers los cuales respeto mucho sus opiniones me decidí a comprar este pequeño DAC y wow suena increíble con un sonido neutral, muy balanceado y dinámico. Lo uso principalmente para reproducir archivos locales en alta resolucion desde el programa audirvana para pc por upnp a un wiim mini conectado a la entrada óptica del este estupendo DAC y de ahi a un yamaha vintage ax930 - Viene a suplir un ifi zen dac v2 .... una ganga por el precio , feliz con mi compra