Wow, the 15" driver looks positively tiny in that enclosure.
One thing I should mention lest I give the wrong impression. An M80 alone should be able to play in the same space as a VOTT if the tone settings are left flat... where the big drivers shine IIRC is when you start cranking the bass boost up a bit. The big drivers can handle bass boost without hitting their excursion limits, while the smaller woofers in modern speakers will start to complain. This is just hypothesis -- I have not had a chance to actually HEAR an M80 against a "classic" larger speaker -- but I think it's a pretty safe bet.
If you want boosted bass at high volumes that's where the big sub starts to shine, in addition to its primary role of playing lower notes than a conventional speaker can handle.
BR, if you decide to try M80s and do a comparison against the VOTTs I imagine a lot of people here would be interested in coming over and watching. You might even get Ian out for something like that
