Since you have a Shiit preamp one of the Shiit DACs between the iMac and the preamp should work fine. Or any DAC with a USB input that you prefer, any DAC will have analog output that can be connected to the Freya.
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You need a USB DAC.
$27 prefect match for your hardware:
I use a Modi Multibit on my PC. ~$280 delivered, silver only.