· Super Moderator
I don't think you're going to find many people who have used so many equalizers that they could name their top three preferences. Most people, I expect, haven't used more than one or two.
As far as "the ones that do the best job," the bar for subwoofer equalization is not terribly high, as perceived sound quality is not an issue as it would be for the main channels. As long as all filters can be set anywhere in the bass range (some older analog models don't have that feature), any parametric EQ with at least 4-5 filters will work for sub equalizing. About the only one I've ever seen any complaints about is the Velodyne SMS-1.
As far as best bang for the buck, the BFD is the hands down winner.
A problem that people with DIY subs often run into is the need for a subsonic filter. Since few EQs offer filtering low enough, the best option is a separate outboard unit like the Reckhorn B1 or S1.