I use an older BBE 422 between my Triaxis and 20/20. Its been in my signal path for years, because it really helps tighten up the signal (especially the low-end). I don't equate the Sonic Maximizer with an eq, such as the Dynamic Voice, because what it really does is to compensate for phase cancellation, using subtle time delays on certain frequency ranges. I do continue to use the Dynamic Voice as well, but generally at lower settings (1-4).
I know there is great controversy about using a Sonic Maximizer, but for me, having tried with and without it (at the touch of a button), it is a no-brainer. The S-M really clarifies the signal, and doesn't significantly degrade the pure tone. I definitely agree that one must not overdo it, though, and the same goes for the Dynamic Voice.
Bottom line is ... use your ears, not your preconceptions.
- Thom