As usual, small diameter drivers are said to be "faster".
Frankly I have never heard a "fast" 16 foot organ pipe. I think that what we really mean is that the cone is under tight control of the power amp, and this depends on the power of the driver "motor" and the mass of the cone rather than the diameter of the cone. If you have an 8 inch driver and a 10 inch driver from the same manufacturer's line, and they both have identical voice coils and magnets it is reasonable to assume that the 8 inch will give "tighter" sound. But if you compare a typical 12 inch driver with a 2" voice coil against a 15 inch driver with a 4" voice coil and twenty-odd pounds of magnet one cannot make assumptions. Throw in servo control, and all bets are off.
Frankly I have never heard a "fast" 16 foot organ pipe. I think that what we really mean is that the cone is under tight control of the power amp, and this depends on the power of the driver "motor" and the mass of the cone rather than the diameter of the cone. If you have an 8 inch driver and a 10 inch driver from the same manufacturer's line, and they both have identical voice coils and magnets it is reasonable to assume that the 8 inch will give "tighter" sound. But if you compare a typical 12 inch driver with a 2" voice coil against a 15 inch driver with a 4" voice coil and twenty-odd pounds of magnet one cannot make assumptions. Throw in servo control, and all bets are off.