I've been listening to a pair of 2226H drivers as the low end of my living room stereo for years now. The boxes are some 5 cubic ft enclosures originally designed for Altec 604s. I added ducts to the original ports to get them running a little more inline with the T/S parameters for the 2226s but I'm a little curious if I could drop the Fs enough to be noticeable by gluing in some 'mass rings" probably just some lead wire hot glued around the perimeter of the dust cap. I reconed these drivers about five years ago so they have plenty of life in them. They're used in a townhouse living room so I'm limited in how loud they will ever get so even with the LF boost I'm giving them with the DSP I have power and excursion capacity to spare. Any speculation as to what I might gain with this mod?