A:Answer Hi JimmJoe,
Thanks for your inquiry. The STR-DH590 doesn't support passive subwoofers. The SUBWOOFER OUT jacks of the stereo receiver are designed for active subwoofers.
Upgrade your home entertainment system to work with the latest 4K TVs and HDR picture. Equipped with 4 HDMI inputs, HDCP 2.2 signal handling, and a host of advanced features the DH590 is the perfect combination of high performance video capability and superb sonic fidelity.
Regards,
-Ralph