Data from v1.1 GC2Types.xml:
(component name, cost, size, sizemod, damage)
"Phasors VII", 50, 6, 4, 5
"Disruptors", 65, 6, 4, 7
"Disruptors II", 65, 5, 4, 7
"Disruptors III", 70, 5, 4, 8
"Subspace Blaster", 60, 6, 4, 6
"Doom Ray", 150, 10, 4, 22
It looks like the Subspace Blaster component was given values intended to fall between "Phasors VII" and "Disruptors" (this is the order in the .xml file, actually), but in the research tree it falls between "Disruptors III" and "Doom Ray." As such, Subspace Blasters are wholly inferior to the weapons that precede them.