How can I manage audio output power save time?

I need to make spdif-audio out always ON, that's needed for my external DAC which is synced on the signal correctly. However, the system mute audio out in about one minute of silence. How can I avoid this power save and keep sync signal always ON, or, at least, increase power save time up to 10-15 minutes?
Thanks!

You may be able to do what you want with Rogue Amoeba's Airfoil for Mac.
Best of luck.

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