Nope - the 8033 does NOT "mask" or "fill" any nulls in the frequency response. As you say, "No matter how much power you apply...the null will never be filled." You are exactly correct. The 8033, therefore, does not even attempt to fill any nulls.

However, "for every null, there is a peak." The 8033 DOES attenuate these peaks to the average SPL. The equalizer must be variable in both amplitude and frequency-range to do so. Some peaks will be broad & shallow - others narrow & steep. The 8033 adapts, apparently, to both, and thus, must be parametric in nature.

I agree with AVS & Hometheatershack in their evaluations. This is the most effective EQ I've ever heard for bass. The "set it and forget it" nature is also appealing - especially since it's so accurate.

Fun, fun, fun!

My opinion is worth exactly what you're paying for it!