HI Rob,
Thanks for the pic - excellent idea - it looks like a single large speaker, and I love the removable grill!!
I was going to have mine either side of my center to balnce the look of things, and now that I've seen your grill, I may do something similar.
Something I picked up from RTFM (Jeff) was to lay some speaker grill cloth over the front of speakers if they are in any way distracting. It works a treat too. I bought a few meters from Maplins as they were local, but IPL do a lot of the stuff in various formats if anyone's thinking of doing the same thing.
I initialy had my sub on a small 12" square paving slab, which sat on two 69mm x 18mm strips of wood which had rubber attached to them. Out of curiosity, I bought a Gramma isolation base to see how that compared, and although it looks nicer, it hasn't made an audible difference to the sound. I think it does reduce the vibrations from the floor which was my main reason for buying it though. I've now got both subs side by side on it, but was going to make two mini Grammas myself, as they are just MDF wrapped in carpet with some high denisty foam 3" x 2" strips on the bottom, and some egg crate style foam betwen the strips. I'll take some pics and post them here when I do it.
Th Wickes Hamilton 12" square paving slabs are £1.49 each, and the 24" x 12" are £1.99. You can then paint them or cover them in carpet to stop them scratching the sub(s). I might try one to see what it looks like. Marble does look a hellava lot nicer I must say.
Of course, any slab will do, so just find the cheapest. Wickes Derby Grey 450mm x 450mm are just 99p each.
Where did you get the rubber from Rob?
Gary.