not very technical, but does anyone know where to get black grill cloth in ottawa

You could try Fabricland, I understand they carry the basic colours of speaker cloth such as black or beige(possibly a couple of others too). You could also contact Solen(Montreal area) or StudioLab(Scarborough) or one of the several online speaker parts suppliers such as Parts Express.

Try your local Fabricland first, though, I've heard their grill cloth is very good(acoustically transparent).

There is also Solens in Quebec (internet order).
Inexpensive and reasonable shipping.
Just google them.

I found grill cloth in a local fabric store. I bet its fairly common.

thank you, i'll try fabricland tomorrow

i picked up some cloth from frabricland, it looks great, i hope to install it tomorrow around my screen

How many colours did they carry?

black and white.
the person thought they could order other colours but she wasn't sure...

If you bought both, you might be able to also make grey.