Headphone Output Operating Modes
The user is provided with three rotary level controls (“pots”) that are associated with the headphone output. Switches SW4-1, SW4-2, and SW4-3 are used to configure the way two of the controls, the one lo- cated on the far left and the one located in the center, function. (These settings don’t impact operation of the sidetone level con- trol which is located on the far right.) With just these three switches a wide range of operating modes can be configured. Care- fully reviewing the capabilities of the avail- able functions may prove worthwhile.
Dual-Channel or Stereo Mode
Switch SW4-1 is used to select whether the control located on the far left and the control located in the center provide a dual-channel (“level/level”) or stereo (“level/balance”) mode of operation. In the level/level mode these two controls operate independently, each controlling the level of one of the headphone output channels. This mode is generally used for on-air broadcast applications where independent cue signals are provided to the left- and right-headphone channels. In the level/balance mode the control on the far left sets the overall output level for both headphone channels. The center control is used to adjust the balance (the relative levels) of the left and right channels. This mode is generally best suited for applica- tions where a stereo cue source is being provided.
Reverse Left/Right Mode
Switch SW4-2 is used to select whether two of the rotary controls are in the nor- mal or reverse left/right mode of opera- tion. When selected to the normal mode, and level/level mode is also selected, the control on the far left adjusts the level of headphone output’s left channel. (This is the signal that appears on the tip lead of the ¼-inch 3-conductor jack.) The center control adjusts the level of the right chan- nel. When selected to the normal mode, and the level/balance mode is also se- lected, turning the balance control in the counterclockwise direction increases the perceived level of the left channel, and vice versa.
As you may have already guessed, when selecting the reverse left/right mode of op- eration everything is reversed! To be more specific, when selected for reverse mode, and the level/level mode is also selected, the control on the far left adjusts the headphone output’s right channel (output jack’s ring lead) while the control in the center adjusts the left channel. When se- lected to the reverse mode, and the level/ balance mode is also selected, turning the balance control in the counterclockwise direction increases the perceived level of the right channel, and vice versa.
The reverse mode is provided specifically for cases where a headset’s left and right earpieces are placed on a user’s head in a reverse orientation. This ensures that the
