Electro-Voice PC Boundary manual Switch Setting Guide, Audio Switches a & B

PC Boundary

Switch Setting Guide:

Audio (Switches A & B)

A – Hi Pass Filter

Start with this switch set to the left (flat response). If the mic is in a location where low frequency rumble or wind noise is encountered, moving this switch to the right will help by reducing low frequency sensitivity.

B – Polar Pattern

The cardioid polar pattern works well for most installations. If feedback from a sound system occurs, switching to the supercardioid pattern will usually allow increased mic gain before feedback. The figure 8 pattern can be used to mic two people sitting on opposite sides of a table, potentially reducing the total number of mics required. The omnidirectional pattern

is best suited for situations where there is no sound

reinforcement system present, such as for recording.Figure 1:

Mic Switch Interface

Mute Switch Configuration (Switches C & D)

(The membrane switch on the top of the PC Boundary microphone.)

Momentary modes:

When switch “C” is set to the left, the mute switch action is momentary. (If switch “D” is in the left hand position, the micillwbe in push-to-mute mode. If switch “D” is in the right hand position, the mic will be in push-to-talk mode.)

Toggle Modes:

When switch “C” is in the right hand position, the mute switch will be in toggle (push-on / push-off) mode. (When the mic is inthis mode, the setting of switch “D” determines if the mic audio should be muted when power is first applied. If switch “D” is in the right ndha position, the mic audio will be muted when power is first applied. If switch “D” is in the left hand position, mic audio will be on when power isfirst applied.)

Logic Mode Select (Switch E)

When switch “E” is set to the left, the PC Boundary operates as a normal microphone. Mic muting and operation of the LED is controlled by the pushbutton on the top of the mic.

When switch “E” is set to the right hand position, the mic will be in automatic mixer mode, and the following will apply:

1)Mic audio is always on.

2)The automatic mixer controls LED operation.

Logic Signals

Logic signal cable hookup guide:

Green – Logic Ground

White – Switch Logic

Orange – LED Control

If the PC Boundary mic is in momentary mode (see above section on the mute switch), the logic level on the white wire will normally be “high”, and go “low” when the mute button is pressed. If the mute switch is set for toggle mode, the logic will toggle from high to low, orfrom low to high, each time the button is pressed. (If desired, a pc board change can be done to force the logic to always be momentary, regardless of switch settings. See diagram.)

LED Control

When the mic is in automatic mixer mode, a low logic signal on the orange LED control wire will cause the LED to light.

Logic Ground Lift

If necessary, the logic and audio grounds can be separated. This requires removing a resistor from the pc board. See diagram.

Remove the center screw and grille to access the pc board.

Figure 2:	Figure 3:
PCB Access	PCB Jumper Locations