18 inches (45.72cm)
minimum from edge of table
25
°
to 45
°
recommended
range of angles
Touch Sensor Control
Red
Green
+5V DC
Touch Ring
Voltage Regulator
10K ohm
Resistor
GND
V+ (8V ~ 28V DC)
Touch Output
LED Red
LED Green
30kHz Boundary Microphones
Installation
The IMB30 and IMBL30 boundary microphones are to be installed on a stiff surface such as
a table, a ceiling, or a wall. The mounting hole is Ø 1 1/16” (27 mm).
The rubber vibration damper ring provides mechanical isolation from the mounting surface
and therefore offer effective sound isolation of the microphone. Do not overtighten the
washer, as this reduces shock isolation.
Thank you for selecting one of the Earthworks
®
IMB30 / IMBL30 boundary condenser mi-
crophone. Please take some time to read carefully through this document before installing
the microphone.
Applications
The IMB30 and IMBL30 boundary microphones are to be installed on a stiff surface such as
a table, a ceiling, or a wall.
Primary applications include teleconferencing, distance learning, surveillance, board-
rooms, government facilities, and ambient room miking
IMB30 Connection
The IMB30 boundary microphone is equipped with a male XLR-3 connector. For operation
it requires a 48V Phantom Supply.
IMBL30 Connection
The IMBL30 boundary microphone is equipped with
a male XLR-3 connector. For operation it requires a
48V Phantom Supply.
The LumiComm
™
LED Touch Ring found in the IMBL30
microphone is touch sensitive and can be used to
turn the microphone either on or off, or any other
programmed function, by touching the light ring. The
IMBL system interface board will allow the touch ring
to be programmed by standard system interfaces
or logic control systems. The IMBL system interface
board is powered from an external power source of 8
to 28VDC @ 85-170 mA (current is dependent upon
number of LEDs illuminated at one time) via a Phoe-
nix or RJ45 connector mounted on the microphone’s
external PCB. The touch ring will emit a momentary
digital pulse from its extendal PCB connector to ac-
tiviate external systems or equipment.
Key Features
•Low profile, aesthetic design
•More gain before feedback
•RF resistance filtering
•Wide frequency range and smooth frequency response
•Near-perfect polar response at 0°, 45° and 90°
•Available with LumiComm
™
programmable bi-color, touch sensitive LED Touch Ring
IMB30 & IMBL30 Boundary Microphones
Microphone Placement
For optimal sound quality, IMB30 or IMBL30 should be in-
stalled a minimum of 18 inches (45.72cm) from the edge
of the table.
The recommended rangle of angles for optimal sound qual-
ity is from 25
°
to 45
°
.
Logic Connection
Always check your power supply polarity before connecting your supply to the LumiComm
™
.
The 10K resistor is not needed if using a Crestron, Biamp or ClearOne controller, as these
controllers are already equipped with pull up resistors. If using a controller that does not
have a pull up digital input, then a 10K resistor may be needed externally.
The LED pins need to be connected to Digital outputs (contact closure or open collector)
that can sink at least 85 mA each.
8V - 28V Logic
5V Logic
Touch Sensor Control
Red
Green
+5V DC
Touch Ring
Voltage Regulator
10K ohm
Resistor
GND
V+ (8V ~ 28V DC)
Touch Output
LED Red
LED Green
5V Supply
Model Variations
The IMB30 is available is available in omnidirectional polar pattern, with or without a Lumi-
Comm
™
LED Touch Ring, with a black, white, or silver finish.
Pin 1) Ground
Pin 2) Supply 8-28 VDC
Pin 3) Touch Sensor Output
Pin 4) Red LED
Pin 5) Green LED
Pin 1) Green LED
Pin 2) Green LED
Pin 3) Supply 8-28 VDC
Pin 4) Ground
Pin 5) Ground
Pin 6) Touch Sensor Output
Pin 7) Red LED
Pin 8) Red LED
RJ45 Connector
Phoenix Connector
