Is there a schematic drawing of a sub box(es) that you are suggesting?I really want to try to have a box design that is similar to the one I posted-for ease of construction. My thoughts on this sub is that I just want to augment the low end a bit and take some of the lower-end strain off the mains-nothing earthshaking, just a little more punch.
Thanks
David
As promised, now with
numbers 
Double checked a few details and the final box can be a tiny fraction smaller without reducing the internal volume, it's now 450mm tall rather than 470.
Good luck,
David.
PS: I haven't given dimensions for how far back to place the handles on the sides - you're best to build the box without them, load the driver and grille then balance it on a thin strip of material to find the real CG and centre the handles there. Just be careful you don't put them too far forward else you may find they foul the driver.
