Here's the final result from all that grid work from this previous post:

The finish is milk paint, which is unlike any modern paint, and really quite beautiful. It has a unique look which works well with antique type finishes (probably because it's the finish that's actually on so many antiques.) Here's a detail:

The cabinets are open on the bottom and simply drop over the subwoofer. Each has a section of lattice that opens to reveal a shelf for some other electronics.