Hi,
Little off topic but you mentioned you were running the onyx through ambre with I2S. Did you try running it via spdif also to compare? I'm wondering if you heard any differences between I2S and spdif?
I have the onyx also but running it via spdif. The only way to use it via I2S would be to purchase an ambre so wondering if spdif to I2S is significant and warrants buying an ambre.