svart-hvitt
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Or alternatively, the idea USB results in better measured performance is disproven for this device.
What it really means is jitter over decent SPDIF and USB is low enough it isn't a limiting factor in performance among most DACs. Except for notable failures (like the USB of Schiit Modi 2 or Sanskrit SMSL), jitter is effectively a non-issue.
I have a recording interface that can have a free running internal clock fed via ASIO, use an external clock over Toslink or use an external clock with the ADAT format, use external clock over coax SPDIF or external clock over BNC coax connection. When fed to my Forte ADC you get identical results with those. Even as close as .4 hz from the main tone the results are the same. The only differences are noise levels below 10 hz between the connections.
Now it is possible the Forte ADC has higher jitter than anything else and is dominating the result. It however has pretty low jitter or it would manifest itself in sum and difference tones and other noise. All of which are very, very low with the Forte.
So checking the Jtest for the various inputs is worthwhile to be thorough. If you don't get sub-par results the type of digital connection doesn't matter audibly.
Which is a strong case for the flexible, light, smooth toslink cables.