Acoustic Research AW-811 - Manual (Page 6)

III. Adjusting the Transmitter
1. Turn ON your audio source (i.e., A/V receiver, TV, stereo, etc.) and play
music at a normal listening volume.
2. Set the channel select switch (K) on the back of the transmitter to 1, 2 or 3.
The transmitter provides three different broadcasting frequencies. In the
event that you experience poor reception or interference, try choosing a
different frequency by moving the channel select switch to another position.
5
H
I K
J
H. Power indicator light I. Transmitter power input jack
J. Audio input cable
K. Channel select switch