Subwoofer placement - does it matter?

I moved my sub around and measured from the sweet spot with a mic. It makes a big difference, and one can also hear it if you do a "sub crawl." (Google that.) Besides moving it to different locations in the room, try raising or lowering it. Also generated big changes. 

Yes. 

To play with this idea, try out the room simulator built into the Room EQ Wizard software, which is free.
Best,
Erik

Thanks, Erik. Didn't realize it had that!

Positioning is the *most* important thing in locating a sub. Then level matching, then phase adjustment.

Simulators are great for giving you ideas. When I’ve used them, I’ve never had measured response in the room agree with the simulator. Maybe simulators have improved since -- I would expect the REW one to be top of the class -- but don’t rely on them too heavily.

The lenghth of a 40 hz sound wave is 28 feet.  I don’t see placement of a sub to matter all that much unless it’s in an auditorium