AMX 20 Wireless Speakers (400-1364) Hints and Tips Faxback Doc. # 14470 Why is there a jack labeled "charger" on the back of the transmitter? The "charger" jack has no function with this unit. The transmitter is also used with a wireless headphone system which uses this jack to charge the headphones. Can more than two of these speakers work together? More than two speakers can be used per transmitter; they just need to be tuned properly. (TLC/ir-07/18/95)