They may not be a household name in the wireless world, but Avlex (U.S. distributor of Mipro) has a hot digital system out and shipping, the ACT-81 single-channel and ACT-82 dual-channel. At roughly $3500 a channel, the system is ceratinly competitively priced, and its feature set is astounding. The range is 20 to 20k Hz, 24-bit, mic modeling, 100-bank frequency scans, and secure encryption with no change in audio quality. The security feature is hot right now, we’re told. Oh, and the Li-polymer battery is extremely lightweight and said to operate up to nine hours. That should be enough for just about any set…