From The Department of Stupid Questions: I'm finally forced to buy my own wireless microphones, and am wondering who assigns the band designations to groups of frequencies these devices use? I ask because I have used the Audio Technica 3000 series, for which the manual refers to the reassigned 600 MHz frequencies as "Band D." The still-available 542-566 MHz frequencies are called "Band C" in that manual. However, the Samson Concert 99 system, which operates in that same 542-566 MHz range, is described on several seller's pages as a "D Band" device. Yet other vendors seem to use all kinds of odd names for their band plans (Galaxy Audio's "D Band" seems to run from 584 MHz to 602 MHz, and they have a different band called "P2," a name that no one else seems to use). Are any of these band names official, as by FCC or a professional association? Or are they picked by the manufacturers? Where do they come from?