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So as I setup to do some testing of electronics, line-level and amplifier (via dummy load). I plan on using this simple, older device for the DAC and ADC work. Obviously this isn't a commercial grade, maximum performance solution, it is a consumer enthusiast sound interface via USB. I looked at some online testing, and seeing good tests, did more research on the hardware. It uses Cirrus Logic CS4398-CZZ for DAC, an older but solid chip and Cirrus Logic CS5361-KZZ for ADC, similar performance to the DAC. Looking fine.
I hooked mine up in loopback (line out to line in) and fired up ARTA.
Here is a 1khz test tone and the ARTA analysis of the input:
Lives up to the tests I've seen online. While I've seen better, it has only been from commerical grade expensive stuff. I think this will work fine for what I want. It gives me a testing floor of 0.0049% THD and -130db noise. For the test above I set the hardware to 24-bit/96k, which I think is the sweet spot for this device. I did find it interesting that to get ARTA to report RMS input of -3db (the setting used for the sine wave) I had to change the line level input to 95/100 in the Windows control panel. If I set to 100, I got a report of -2.2db so there would have been some internal gain in the line level side of things.