Can the Air LP preamp be disabled?

I got tired of the Bluetooth through my Bose home theater. When the music gets particularly intense, it seems to “rumble.” I attempted to physically connect it to my Phono jack on my Sansui receiver. Crazy Humming ensued. I would rather use the preamp in the vintage Sansui as it is excellent. Is there no way to disable the preamp in the Ion Air? If not I’ll be getting rid of it.
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