DIY Perforated metal grills?

Careful they tend to vibrate and also it will muttle the sound a bit, you will loose cliarity. If you are worried about sound quality I wouldn't recomend it. Speakers like Canto that use them are tuned for the grill and have done extensive reasearch on the size holes etc...

thanks for all help!

Let us know the resonant frequency and amplitude of the grills once you have them in place.
Jay