You can get perforated metal in 4'x10' sheets from most sheet meatl shops and they can shear it to the right size.
DIY Perforated metal grills?
In the 80's my father had a pair of ADS speakers with a matte black perforated metal grill and I always loved that look, can material be purchased already perfed and then cut to size, painted and mounts attached?..(paint and mounts DIY)
thanks
thanks