Many external soundcards/processors plug into the USB ports to achieve output, and that output should be as flat as possible. But if they use the onboard sound chip they will never be perfectly flat. They are cheap and inaccurate, falling off before you even consider reaching 10hz, let alone other inaccuracies. So does anyone know how USB/PCI/PCIe generate their audio signals? I imagine they would have to gain the data through binary info, just like I presume a cheap chip would. That would be good for my goals. But I don't know, just don't want to use a port that uses audio from a source that could make me lose info beyond different freqs.
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