Earthworks IMB30-SS Users Manual

Dimension Drawings

IMBL30IMB30

IMB30 & IMBL30

30kHz Boundary Microphones

User & Installation Guide

Frequency Response & Polar Response

The frequency response is measured with the microphone installed ush in a 3’ by 3’ rigid
surface with incident sound waves hing the boundary at a 45 degree angle. It is to be noted
that the microphone’s low frequency roll o can be aected by the surface area of the bound­ary. The frequency at which the boundary’s area starts to inuence the low end roll o can be
calculated by F=750/A, where A is the area of the boundary.

IMB30 & IMBL30 Frequency Response

45 Degrees Incidence

True Semisphere™ Polar Response

Specications

Frequency Response: 60Hz -30kHz ±2dB @ 45° incidence
Integrated Low Cut Filter: -15dB at 60Hz
Polar Paern: True Semisphere™
Sensivity: 60mV/Pa @ 1kHz
Power Requirements: 24-48V Phantom, 10mA
Max Acousc Input: 136dB SPL
Noise: 20dB SPL (A weighted)

Earthworks, Inc. • 37 Wilton Road, Milford, NH 03086, USA

Email: [e-mail] • Phone: [phone] • Fax: [phone]

Output: XLR-3 (pin 2+)
Min Output Load: 1K between pins 2 & 3
IMBL Light Ring Connector: Phoenix or RJ45
IMBL Light Ring Voltage: 8-28VDC @ 85-170mA
IMBL Light Ring Acvaon: Momentary Digital Pulse
Microphone Color: Black, White or Stainless Steel
Weight: 0.28 lbs (125g)

IMB30 & IMBL30 Boundary Microphones

10K ohm
Resistor

GND

V+ (8V ~ 28V DC)

Touch Output

5V Supply

30kHz Boundary Microphones

Thank you for selecng one of the Earthworks® IMB30 / IMBL30 boundary condenser mi­crophone. Please take some me to read carefully through this document before installing
the microphone.

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

Applications

The IMB30 and IMBL30 boundary microphones are to be installed on a s surface such as
a table, a ceiling, or a wall.

Primary applicaons include teleconferencing, distance learning, surveillance, board­rooms, government facilies, and ambient room miking

Model Variations

The IMB30 is available is available in omnidireconal polar paern, with or without a Lumi­Comm™ LED Touch Ring, with a black, white, or stainless steel nish.

Installation

The IMB30 and IMBL30 boundary microphones are to be installed on a s surface such as
a table, a ceiling, or a wall. The mounting hole is Ø 1 1/16” (27 mm).

The rubber vibraon damper ring provides mechanical isolaon from the mounng surface
and therefore oer eecve sound isolaon of the microphone. Do not overghten the
washer, as this reduces shock isolaon.

Microphone Placement

For opmal sound quality, IMB30 or IMBL30 should be in­stalled a minimum of 18 inches (45.72cm) from the edge
of the table.

The recommended rangle of angles for opmal sound qual­ity is from 25° to 45°.

IMB30 Connection

The IMB30 boundary microphone is equipped with a male XLR-3 connector. For operaon
it requires a 24-48V Phantom Supply.

IMBL30 Connection

The IMBL30 boundary microphone is equipped with
a male XLR-3 connector. For operaon it requires a
24-48V Phantom Supply.

The LumiComm™ LED Touch Ring found in the IMBL30
microphone is touch sensive and can be used to
turn the microphone either on or o, or any other

RJ45 Connector

Pin 1) Ground
Pin 2) Supply 8-28 VDC
Pin 3) Touch Sensor Output
Pin 4) Red LED
Pin 5) Green LED

programmed funcon, 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 me) via a Phoe­nix or RJ45 connector mounted on the microphone’s
external PCB. The touch ring will emit a momentary
digital pulse from its external PCB connector to ac­vate external systems or equipment.

Phoenix Connector

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

Logic Connection

Always check your power supply polarity before connecng 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

GND

5V Logic

V+ (8V ~ 28V DC)

25° to 45°
recommended
range of angles

18 inches (45.72cm)

minimum from edge of table

Touch Ring

Voltage Regulator

+5V DC

Touch Sensor Control

Red

Green

10K ohm
Resistor

Touch Output

LED Red

LED Green