My dealer used this term and it doesn't make sense to me. I think he wanted me to buy a cab that has been on the floor for a while. Say you've got two cabs, one rated at 250 watts and the other rated at 400 watts. The sensitivity is the same at 103db. If you hook up a 300W amp to either cab and don't run the amp to clipping, there should be no difference, (other than the different character of the cabs), right? To me a good analogy is this: If you drive a Ford Pinto and a Ferrari, which have different "power handling" abilities, at 50 miles per hour, both will do just fine. It is when you ask the Pinto to go 100 m.p.h. that it will suffer. As I understand power ratings, they are derived in the lab by passing voltages thru the speaker and seeing how much can pass without damage. It is not measured as a program measurement, meaning real music being amplified. (Some might call amplified music an oxymoron ) If you want to fill an auditorium with bass, you need a high power amp and a high power speaker. If you want to fill a small club with bass, you need a medium power amp and can use a high power speaker, if you like the sound of it best. Right?