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In this proceeding, the Commission seeks to enhance the spectral efficiency of wireless microphones by permitting a recently developed type of wireless microphone system, termed herein as a Wireless Multi-Channel Audio System (WMAS), to operate in certain frequency bands. This emerging technology would enable more wireless microphones to operate in the spectrum available for wireless microphone operations, and thus advances an important Commission goal of promoting efficient spectrum use. The Commission proposes to revise the applicable technical rules for operation of low-power auxiliary station (LPAS) devices to permit WMAS to operate in the broadcast television (TV) bands and other LPAS frequency bands on a licensed basis. The Commission also proposes to update the existing LPAS and wireless microphone rules to reflect the end of the post-Incentive auction transition period and update references to international wireless microphone standards.