Hi hobbyist i linked my amiga up to one of these boxes, a magic vga one like ur. I like in UK if this makes any difference. Ive also liked the box up to my freeview box and XBOX. (The s-video input is nt very good i dont know why this is it could be because i got it off ebay)
the xbox and freeview box were ok. But the amiga display ok but was jumpy ie the screen moved up and down by a couple of pixels every second or so.
Did it do this for u ? if not what modes did u use i think i had standard res 800*600 and 60hz. And used composite in.