I got to use one live on kick. Pretty well balanced and didn't put the channel into overload too early.
One of the neat things about the 'Ball' is its circuitry. With most dynamic Mics their impedance will change with the frequencies shown to the mic which can cause some phasing and slightly inconsistent gain. Its usually pretty minor but its there.
The phantom Power required by the 'Ball' is for the balancing circuit not the element.
The claim is to offer the same impedance throughout the frequency response of the Mic.
Here is a cut and pase from Blue's website
Blue Ball"Most recordists know that conventional dynamic mics do not require external DC power. Rather, they employ a relatively simple circuit and derive their output voltage through electromagnetic induction. While this makes them rugged, reliable and easier to operate than their electrostatic counterparts, they also present the user with a unique set of problems. Chief among these is frequency-dependent variable resistance which has dramatic effects on the transducer’s acoustic balance, phase coherence, noise specification and overall output. Our engineers solved this problem by incorporating a phantom-powered proprietary active balancing circuit in the Ball’s output stage. This circuit maintains a constant pure-resistive 50-ohm load across the usable frequency spectrum yielding an exceptionally smooth and open sound previously unheard of in a dynamic microphone. Additionally, as a dynamic mic, the Ball is capable of handling extremely high sound pressure levels without distortion"
Hope it help you in your quest.
Mick