Hi BlackCat. If only it were that simple. Each speaker and cabinet design has a different SPL (the amount of volume produced per watt). They also vary in the range of frequencies produced. Therefore not all 12s are the same. Check the SPL specifications before parting with your cash. A small difference in SPL makes a lot of difference to the volume heard. And make sure it'll reproduce the low frequencies that you need (5 string low B is 31Hz). Some (inexpensive) small bass cabs sound a bit thin. Also make sure the cab will handle the maximum power your amp can cleanly produce, at the impedance of the speaker. Distortion from an over-driven amp (especially valve amps) will fry even the most expensive high wattage speaker. Finally you have to take into account the placement of the cabinet. You get the most projected (bass frequency) volume if the cabinet is on a solid floor, in a corner. Less if it's back's against a wall. Less still if it's away from the rear wall. And a lot less if it's not on the floor. The only draw-back I've found with my 1x12 is that if I stand too close to it, although the audience can hear it, I can't. In really big rooms with my 18 piece band I angle the cab up towards my head so I can hear it, and DI through the PA and fold-back for the audience and band.