Using ARTA for measurements, Win7 x64, but I'm having trouble with SPDIF inputs on my venerable M-Audio Delta 66 cards.
Looks like buggy driver - L/R channels are wildly different, and much odd distortion, completely dissimilar results when using WDM vs ASIO drivers, also sample-rate dependent...
I have a bunch of graphs like those (and worse), and that's with cable looped back. But it's ancient hardware and there'll be no new/fixed x64 driver. In short, time for a new soundcard/interface.
PCI, and PCI Express available, and preferred over USB; I only need the SPDIF I/O (coax or balanced, not Toslink), as I have a decent external ADC/DAC (Sonifex) and keep conversion outside the PC (often only ADC, as some DUTs have digital ins/analogue outs).
Many soundcard suggestions around, but most (M-Audio 192, [email protected] XTe, etc) seem discontinued.
What has solid drivers, and is current?
Looks like buggy driver - L/R channels are wildly different, and much odd distortion, completely dissimilar results when using WDM vs ASIO drivers, also sample-rate dependent...

I have a bunch of graphs like those (and worse), and that's with cable looped back. But it's ancient hardware and there'll be no new/fixed x64 driver. In short, time for a new soundcard/interface.
PCI, and PCI Express available, and preferred over USB; I only need the SPDIF I/O (coax or balanced, not Toslink), as I have a decent external ADC/DAC (Sonifex) and keep conversion outside the PC (often only ADC, as some DUTs have digital ins/analogue outs).
Many soundcard suggestions around, but most (M-Audio 192, [email protected] XTe, etc) seem discontinued.
What has solid drivers, and is current?
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