The "common scuttlebut" for use as a Bass equalizer is for the Behringer Feedback Destroyer Pro DSP1124A (or its predecessor the DSP1100). Also fyi, the DSP1124A is now being replaced by the FBQ2496...
All of these units operate as feedback killers for PA system but they also include "digital" parametric equalizers. That equalizer is what some are using to perform Bass equalization. The belief is that "digital" equalization has less (no?) discernable detrimental effect on the LOW frequencies as opposed to the rest of the audio spectrum.
That being said (and to add to the confusion), conceivably, they could also be used the same way as the DEQ2496.
All of these units operate as feedback killers for PA system but they also include "digital" parametric equalizers. That equalizer is what some are using to perform Bass equalization. The belief is that "digital" equalization has less (no?) discernable detrimental effect on the LOW frequencies as opposed to the rest of the audio spectrum.
That being said (and to add to the confusion), conceivably, they could also be used the same way as the DEQ2496.