The 8033 user's manual doesn't go into very great detail about how it works. From what I've read online, it attenuates the peak frequency (one or more?) without doing any valley boosting. Therefore, the overall effect is to reduce the signal strength (across the sub's spectrum). To compensate, you may have to slightly increase the sub's volume to balance the "corrected" sub with the main speakers.

You have the choice of equalizing a specific "sweet spot" (what I did) or running multiple calibrations across a wider area & letting the box average them.

Alas, I have no spectrum analyzer other than my iPhone, which is notoriously uneven in the deep bass. There should be a plethora of good information (and professional reviews) of the 8033 around on the internet. Feel free to investigate. My comments are but my own (very initial) impressions.

I must agree with you, though, this device does sound VERY cool!

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