There's no need to buy a pricey "audiophile" subwoofer cable. But it's still worth getting a well-built, properly shielded one.
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Do Expensive RCA Cables Make a Difference? (Furutech, Oyaide, Maze, RAMM & Analysis Plus Compared)
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Powered Subwoofer Cable
TX-NR6100 - Connecting a subwoofer – Onkyo Product Support
The Difference Between a Passive and Powered Subwoofer
Optical vs HDMI: Which Is Better?
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SVS SoundPath Subwoofer Cable
【Wide Application】: The coaxial output (S/PDIF) can transmit the analog audio signals in general, it can also transmit digital audio signals well for
VIOY Coaxial Digital Audio Cable (3.3FT/1M), [Gold-Plated & Braided] Subwoofer Cable RCA Male to Male HiFi 5.1 SPDIF Stereo Audio Cable for Home
How To Place Your Subwoofer Home Theater Audio Guide 2023