Bob, if I tell you I'd have to shoot you ... just kidding. To be honest their exact complete physical/psychological workings are beyond my tiny brain. But like any audiophile I try and make up my own opinion by trying them out. And I didn't just try them out, researched their origins, and try and comphrehend its technical aspects, I also heard other's experiences and opinions, heard them in other rooms. Extensive a/b testing etc.
These things really work, and are especially welcome to audiophiles whose main living room is the actual room where the system resides. No big bass traps, panels etc. therefore a high WAF.
You can start by reading the 6moons.com series of reviews. These are as unbiased a group of audiophiles that exists.