veneering upper/lower baffle corners

[Ang]

I've read various guides about splicing verneer, but I haven't seen anything about the best way to cover the 4 corners of the front baffle if all edges are beveled. Any good methodology for this?

[Wodgy]

There is no easy way to do this. Most builders who want this effect use real wood roundovers for the four sides then just veneer the flat front, like these:
http://www.diyspeakercabinets.com/GR_Murphy.htm

The reason it's not easy is twofold: most veneers do not bend well against the grain (you need to do this on two sides); it's both hard to get it flat against the surface and the veneer tends to crack; second, the shape you need to cut out of the veneer to do the corners is tricky (try this with a piece of paper and you'll see why), so you basically have to do two sides, trim along a curve, which is difficult, then do the other two sides. It's extremely difficult to do right. I'd either suggest doing roundovers on only two sides, using quarter rounds of real wood on all four sides, or using a real wood solid front baffle.