When I hook it up to play there is music for a second or two and then no music for a second or two. This repeats itself over and over again. Ideas?

I do not have that problem with this device, HOWEVER, I do have that very same problem with another SMSL dac ( M500 MKII), and I have not been able to figure out why this happens. I do not use Windows, and I only play wav files with Linux based software, and Linux operating system. Make your own conclusions.

how come the output voltage is so low when I connect it to the optical on my TV? I thought the output was suppose to be 2 Vrms.

only tried whit coaxial in rca out

Without a separate power input, how much faster does the battery drain on the cell phone?

It consumes very low energy. I don't use it via USB. I haven't tested it.

I'd like to listen to one of those new MQA-encoded CDs. Will the optical output of my legacy CD player pass the MQA-encoded signal to this SMSL?

Yes, because the SMSL is reading, converting the signal and your legacy CD player is functioning as a transport only.

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

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

Product ID: 730328152

Details

Brand
Fanmusic
Interface Type
USB
Number of Channels
2
Number of Pins
4
Product Dimensions
9.6L x 7.8W cm

⚡Supports PCM up to 768kHz & DSD512 high-res audio

🎧AK4493S DAC chip with ultra-low distortion 0.00013%

🔗Full MQA & MQA-CD decoding for authentic 3D sound

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Sold byAmazon NicaraguaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎶 Elevate your audio game—because your ears deserve the studio experience!

MQA FULL DECODING - Unlock the original studio-quality 3D soundstage with full MQA and MQA-CD compatibility—hear music as the artist intended.
PURE AK 4493 S POWER - Experience pristine audio with distortion below 0.00013%, delivering crystal-clear sound that reveals every detail.
HI RES AUDIO MASTERY - Seamlessly handle ultra-high sampling rates up to 768kHz PCM and DSD512 for audiophile-grade playback.
COMPACT ENERGY EFFICIENT - Sleek, lightweight design (195g) with under 5W power consumption—premium sound without the bulk or waste.
UNIVERSAL USB COMPATIBILITY - Plug & play across Windows, Mac, Linux, Android, and iOS with asynchronous USB transmission for jitter-free sound.

The S.M.S.L SU-1 is a compact, high-performance DAC featuring the latest AK4493S chip, delivering ultra-low distortion and exceptional dynamic range. It supports ultra-high-resolution audio formats including PCM up to 768kHz and DSD512, with full MQA and MQA-CD decoding for authentic, immersive 3D sound. Compatible with a wide range of devices via USB, optical, and coaxial inputs, it offers professional-grade audio clarity in a sleek, energy-efficient package favored by audiophiles and music professionals alike.

Specifications

ASIN	B0C1Y7C9HH
Amazon Bestseller	#22,352 in Electronics ( See Top 100 in Electronics ) #12 in Digital-Analog Converters
Brand Name	Fanmusic
Compatible Devices	Earphones, Headphones both
Customer Reviews	4.3 4.3 out of 5 stars (1,669)
Interface	USB
Item Dimensions L x W	9.6L x 7.8W cm
Item Weight	195 Grams
Manufacturer	SMSL
Model	SU-1
Number of Channels	2
Number of Pins	4
Part Number	SU-1
Warranty Description	1 Year Mecha Warranty

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