If i can build this reasonably i would consider this since it will take a weekend or so to create this monster. Obviously time needs to be considered, not just the materials cost. What is the best sub out there for the $. I figure to get a used Servo-15 or Mirage BPS-400 for around $600-$700 or so used (theres a BPS 400 on audiogon right now for $500). Tell me what i can build for $500-$600 that will outperform these two subs above. I prefer a box design since the new sub will be placed in one of the front corners with a large bass trap on top of it (my room is fully treated acoustically). This NEW sub is replacing a good sub in it's own right, an HSU VTF-2. I see many DIY subs here on the forum but i haven't found many specs on how these perform in the real world. Some of the DIY subs play low, by reading the posts that is obvious but is the said sub musical at the same time? Is the frequency response flat? Is the said sub easy to blend with tower and/or smaller main speakers, etc? What are the costs, labour? Why am i considering the Servo-15 you ask? For one it goes down to the lowest frequencies with authority not to mention that this sub i hear is very musical at the same time. The woofer can start and stop just as quickly and this tells me by the specs and the reviews that this sub is hard to beat whether by a commercial design or DIY. I've also heard this sub in person. If i could buy this sub for say $600-$700, i would have everything i would need in terms of bass output for my 12x18.5 room, not to mention that the sub is already built so there is no labour involved in going the DIY route. In other words convince my to go DIY. All the criteria about deep bass and musicality (when needed) must obviously be met. I do not want to make what looks and sounds like a car boom box. On a seperate note, this new "Tumult" driver looks interesting but the question is when is this available and is there an optimal box configuration all ready in place or prototypes illustrating the real world specs? The Stryke HE15 for example looks to be an awesome/killer sub but materials alone just for the box/drivers is in the $1k range and that's without amplification! Too rich for my blood. What are my options and what are the best/cheapest ways to order the needed drivers, parts, etc in Canada?