Hi John,JohnG wrote: ↑Sat Jul 07, 2018 10:30 am I intend on making a pair of these for my wifes living room system.
I will also get the benefit from them as well.
Any further information available to support the methods of cabinet bracing suggested would be appreciated, I'm ripping down 25mm Plywood this week for the boxes.
With a cab of this size I would put in three braces. (five pieces in all)
The first would be a single longitudinal brace, top to bottom of the cabinet. You need to fill it with holes (three inch holesaw is ideal) and offset it by 12.25mm from a top to bottom centre line drawn on the inside of the back panel. Just draw a centre line and put the brace edge on that line. This will give you automatically, the right offset.
Additionally, with the longitudinal brace, you need to make a cutout in it so the driver will go in. The rear of the driver magnet is up against the brace when fitted into the cab. Also take care that the brace does not block the hole in the rear of the magnet.
The vertical brace connects the front, back and top and bottom panels and is the most time consuming to make and fit but it is worth the trouble.
The horizontal braces are much easier. I would make two small ones to fit either of the vertical brace, one running just above the horizontal centre of the driver, above the hole in the magnet and another two half way between the first one and the bottom of the cab. The top two can be six inch wide holey rectangles that run past the rear of the driver without being shaped around it but the bottom ones can be the full depth of the cab, as there is no driver in the way to make things difficult.
That lot should make the cabs rigid and relatively inert.
Hope that helps.