The special Wizzy M-line uses a side vented, “M” shaped Transmission Line similar in concept and design to the NM-410 (above). As a result, it goes much deeper than the standard Wizzy and has less of a midrange push.

Also, the highs from the M-line Wizzy seem more bright and present than the regular Wizzy. This is likely due to psychoacoustics (due to the somewhat reduced upper mids, relative to the Wizzy), but nevertheless, that is how the tone is perceived.

So, on the whole, the M-Line Wizzy should sound more like the (discontinued) VL-208 than the regular Wizzy. Dimensions (not counting the plastic corners) are 15.6"W x 19.0"H x 12.5"D, and the weight is about 34 lbs.