Of course, I carefully read your message Bracing with regard to bracing the long panels with expansion foam; now I'd like to know how you do this exactly. Filling in the foam seems to be a 'dangerous' job, because you don't see what really happens inside the cabinet.

I would leave the cabinet open at the back and fill 3/4 of the cavities with the foam to preload the horn slopes, side panels, top and bottom panels.

After that I would assemble the back panel and drill the holes to fill the remaining 1/4 of the cavities. To my mind this reduces the risk of cracking the cabinet.

What do you think of this? Thanks for your assistance.

Harald

Another question: The cabinets are glued, that's sure, but do you also screw them? Recently, my carpenter told me that it's absolutely sufficient to glue the panels.

I'm not sure if that's true, particularly with regards to large cabinets such as folded bass horns.

Thanks again.

Harald

Having said that, my cabinetmakers still use screws in some places within complex cabinets. They are used as clamps to provide hold-down strength while the glue is drying. They actually could be removed after the glue dries, but there really is no need. So they're left in place.