Most users do not need a license to operate this wireless microphone system. Nevertheless, operating this microphone system without a license is subject to certain restrictions: the system may not cause harmful interference; it must operate at a low power level (not in excess of 50 milliwatts); and it has no protection from interference received from any other device. Purchasers should also be aware that the FCC is currently evaluating use of wireless microphone systems, and these rules are subject to change. For more information, call the FCC at 1-888-CALL-FCC (TTY: 1-888-TELL-FCC) or visit the FCC’s wireless microphone website at http://www.fcc.gov/cgb/wirelessmicrophones.
Clean up the antenna farm.
The active Sennheiser AC 3 Antenna Combiner is the opposite of an antenna splitter. Much like the ASA 1 splitter, the Sennheiser AC 3 combiner allows In-Ear Monitor (IEM) transmitters to share an antenna as well as to get power distribution. The idea is to clean up the antenna farm and alleviate the problems inherent in having multiple antennas in the same area. The Sennheiser AC3 combines up to 4 Sennheiser evolution wireless IEM transmitters.