Electro-Voice PC Boundary User Manual

Key Features:

• Selectable polar pattern to easily adapt

to different acoustic environments.
Choose between omni, cardioid,
supercardioid or figure 8.

• Exceptional sound quality with EV’s

proven PolarChoice design.

• Consistent microphone voicing across

all four patterns.

• Easy to use mute switch. Can be

programmed to operate as either latching
on/off or momentary push-to-mute /
push-to-talk.

• Disassembly of the mic isn’t required to

change switch functions or for use with
automatic mixers.

• Compatible with echo cancellation for

conference applications.

• High visibility blue LED clearly displays

mic status to the user and can be
remotely controlled in automatic mixer
mode.

PolarChoice Series:

PC Boundary

Multi-Pattern

Boundary Microphone

General Description:

The PC Boundary mic is a low profile microphone that can be used with standard and automatic mic mixers. The PC
Boundary mic is a member of the EV PolarChoice™ series of multi-pattern microphones. The multi-pattern versatility
of the PolarChoice™ microphone makes it a true “problem solver”. With one non-directional and three directional
polar patterns available, PolarChoice™ microphones are ideal for virtually any installation. Of particular interest is the
figure 8 pattern that allows miking people on opposite sides of a table with only one microphone, while providing a
dramatic reduction of ambient room noise.

The PC Boundary mic features a large soft-touch mute button. The mute button can be configured for push-on /
pushoff, push-to-talk, or push-to-mute functions. Mute switch programming is easily accomplished without
disassembling the microphone. The microphone can also be programmed to be either live or muted when power is
initially applied (when in toggle mode). Additionally, a switch on the bottom of the mic, quickly converts the PC
Boundary to automatic mixer mode. In this mode, audio is always on.

A large blue LED indicator lights when the mic is active, and can be remotely controlled when the mic is in automatic
mixer mode.

The PC Boundary mic is designed to take acoustic advantage of placing a microphone close to a “boundary” such as
conference table. Advantages include reduced phase cancellation and up to 3dB reduction in ambient noise.

The PC Boundary mic also includes a switchable high pass filter and a high-performance vibration-damping pad on
the bottom to greatly reduce any vibration induced noise pick-up.

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.

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 mic will be in push-to-mute
mode. If switch “D” is in the right hand position, the mic will be in push-to-talk mode.)

Figure 1:

Mic Switch Interface

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 in this 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 hand 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 is first 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:

Logic Signals

Logic signal cable hookup guide:

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, or from 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.

1) Mic audio is always on.

2) The automatic mixer controls LED operation.

Green – Logic Ground
White – Switch Logic
Orange – LED Control

Remove the center

screw and grille to

access the pc

board.

Figure 2:

PCB Access

Figure 3:

PCB Jumper Locations