Does the WiiM Sub Pro work without other WiiM devices?

Yes. It has an RCA line input, so it can run as a standard powered subwoofer with any source that has a subwoofer or preamp output. The Wi-Fi, Bluetooth and multiroom features are where WiiM gear adds the most.

WiiM rates it from 25 Hz to 200 Hz. That is genuine subwoofer territory for music and most movie content, though an 8-inch driver will run out of headroom sooner than a larger sub in a big room.

Can I place it wirelessly away from my system?

Yes. Wi-Fi 6 and Bluetooth 5.3 let it connect without a cable to a compatible WiiM streamer or source. A wired RCA connection is still the simplest, lowest-latency option.

Is there room correction or EQ?

It has a built-in equalizer, adjusted through the WiiM app. That lets you tame room booms or lift the low end, but it is manual EQ rather than automatic room correction.

The subwoofer and a user manual. Check for the power cable and any wireless setup instructions in the packaging.

Is it good for home theater?

It can handle movie soundtracks, but it has a single RCA input and no LFE-specific input, and its 8-inch driver suits small to mid rooms. Large theaters with demanding output needs are better served by a bigger sub.