Looks like reliability issues in production - Vintageflanker reviewed the sibling SMSL PO100 AK and the first product where broken. The second unit was fine.Why do I have so much noise on my SMSL SU1 usb input and not on the spdif optical input. I have purchased the excellent E1DA Cosmos ADC to make measurements on a few DAC and amps and discard the bad one. The SU1 is supposed to be the standard for comparison. However I have difficutlties with the SU1 usb input.
The SU1 is attached to a desktop computer, the E1DA to my laptop on battery.
When I feed the SU1 through optical I have very good results close to Amir .
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However with the same settings I have bad results when using the USB input.
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Although the THD is still excellent I just wonder why I have so much noise ? The noise cannot comme from the ADC nor the computer because it was good on optical with the same other connections, I mean USB powered on the desktop on the SU1 and USB powered by laptop on the ADC.
Is my SU1 bad or is there another explanation ?
S.M.S.L PO100 AK - Measurements / Round 2 Hi folks, This is an update over my previous measurements of the S.M.S.L PO100 family. I will focus precisely on the PO100 AK, which not only is an USB to S/PDIF converter (as are the PO100 and PO100 PRO) but also a budget DAC, that claims to perform...
Be sure to buy this product where you have warranty to get the money back ( avoid Amazon ) .