I was looking on avatars site to see how much a cab was and i was looking into one of the 2x12's on there and it says something kind of confusing.

it has the option of two vintage 30's at 120w but how do two 30 watt speakers make 120w?

it also has the option of of a vintage 30 and a g12h30 together at 60 watts and those are both 30 watt speakers as well.