| @ FromTheBassMent: No, they are not saying that choosing 12's limits you to using only 12's
What they are saying is that adding another identical cabinet is the best choice if you want to have the same sound but more volume (the most common reason for adding more cabs)
You can effectively use any combination of cabinets that your head is capable of running, but a 115 even from the same manufacturer will have different power handling and tonal qualities to the 212, this means that the cabinets will respond differently to any eq adjustments you might do and if pushing the cabs, you could find one cab distorts before the other due to the different power ratings.
Of course if you are a player who pays attention to what your rig is doing then these really aren't issues. They are just saying that theoretically adding another identical cab is gonna have less possibilities of messing with your sound than a different one |