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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SMSL SU-1 MQA MQA-CD Audio Decoder AK4493S XU316 768kHz/32Bit DSD512 Hi-Res DAC

Product ID: 523799771

Details

Brand
Fanmusic
Interface Type
Coaxial USB
Mounting Type
Coaxial Plug
Number of Channels
2
Number of Pins
8

⚡USB input with 768kHz/32Bit & DSD512 hi-res decoding

🎧AKM AK4493S DAC chip, ultra-low distortion <0.00013%

🔊Supports MQA & MQA-CD for studio-quality sound

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Description

🎶 Elevate your audio game—hear what others miss!

HI RES AUDIO COMPATIBILITY - Seamlessly supports ultra-high resolution formats up to 768kHz/32Bit PCM and DSD512 for audiophile-grade listening.
STUDIO GRADE SOUND CLARITY - Experience pristine audio with the AKM AK4493S DAC chip delivering distortion below 0.00013%, elevating every note to perfection.
UNIVERSAL USB CONNECTIVITY - Plug-and-play with Windows, Mac, Linux, Android, and iOS devices—your versatile gateway to premium sound.
AUTHENTIC MQA MQA CD PLAYBACK - Unlock the original master studio quality from your digital and CD sources with full MQA decoding and authentication.
COMPACT COPPER BUILT DURABILITY - Sleek, lightweight design with premium copper material ensures both style and lasting performance on your desktop setup.

The SMSL SU-1 is a compact, high-performance MQA and MQA-CD audio decoder featuring the advanced AKM AK4493S DAC chip. It supports ultra-high resolution audio formats up to 768kHz/32Bit PCM and DSD512, delivering studio-quality sound with ultra-low distortion. Compatible across major OS platforms via USB, it transforms your digital and CD audio sources into authentic, crystal-clear listening experiences, all housed in a durable copper chassis.

Specifications

ASIN	B0C1Y7C9HH
Best Sellers Rank	#12,892 in Electronics ( See Top 100 in Electronics ) #24 in Digital-Analog Converters #27 in Signal Converters
Brand	Fanmusic
Brand Name	Fanmusic
Compatible Devices	Speaker, Headphone
Customer Reviews	4.2 out of 5 stars 1,694 Reviews
Included Components	SU-11, Type-A to Type-C USB Cable1
Interface	Coaxial, USB
Interface Type	Coaxial, USB
Item Dimensions L x W	3.78"L x 3.07"W
Item Weight	195 Grams
Manufacturer	SMSL
Material Type	Copper
Model	SU-1
Mounting Type	Coaxial,Plug Mount
Number of Channels	2
Number of Pins	8
Part Number	SU-1
Product Dimensions	3.78"L x 3.07"W
Smart Home Compatibility	Not Smart Home Compatible
Unit Count	1.0 Count

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