Another comparison question:
EA subspace bomb vs GTVA meson bomb - both seems to be circa 5 km range in space, but subspace boms seems to fit to regular container and been able to crack open entire planet.
I think the techroom description you mean was talking about an "upsized" device, whatever that means. It was one of the things I complained about while testing, because it throws logic out of the window, something like the "Doming Luna to make it habitable" kind. Even if the device would've been the size of a destroyer EA could massproduce it; and it would give them the power to demolish a Gigas- or Gargant-fleet several times the size of the Sathanas armada instantly.