The Technisonic A711X and A711X are Audio Controller Expansion Panels which compliment the A710 and A710 Audio Management System by providing for six more communications positions While the A710 and A711 can control a maximum of seven separate transceivers positions, the A710X and A711X when used in conjunction with the A710 or A711, can provide for a maximum of 13 audio controller positions. The A710X and A711X are TSO’d to the newer C139 standard.