Earthworks IMB30-B Datasheet
IMB & IMBL High Definition Boundary Microphones
For Boardrooms, Teleconferencing & Government Facilities
IMB Series
Impulse Response
Frequency Response
45 Degrees Incidence
™
Near-Perfect Polar Response
David Blackmer, founder of dbx® and Earthworks® invented a number of new microphone
technologies resulting in a totally new approach
to microphone design. One such technology
was the creation of near-perfect polar response.
When you look at the polar response of an Earthworks microphone, the mid-frequencies, high-frequencies and low-frequencies all look very close
to a “textbook” perfect polar pattern. In practice
this means the polar response of an Earthworks
microphone is extremely uniform over its operating frequency range; the frequency response at
90º and 180º off-axis is very close to the on-axis
response. This uniform polar response results in
less phase problems and much higher intelligibility at the sides of the microphone.
Installation
IMB & IMBL boundary mics 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 frequency response in this document is
measured with the microphone installed ush in
a 3’ x 3’ (.9m x .9m) rigid surface with incident
sound waves hitting the boundary at a 45 degree
angle. It is to be noted that the microphone’s low
frequency roll off can be affected by the surface
area of the boundary. The frequency at which the
boundary’s area starts to inuence the low end
roll off can be calculated by F=750/A, where A is
the area of the boundary.
IMB SERIES
SPECIFICATIONS
Frequency Response:
Integrated Low Cut Filter:
Polar Pattern:
Sensitivity:
Power requirements:
Max Acoustic Input:
Min. Output Load:
IMBL Light Ring LED Colors
IMBL Light Ring Connector:
IMBL Light Ring Voltage:
IMBL Light Ring Activation:
Microphone Color:
60Hz to 30kHz ±2dB at 45 degrees
incidence to the surface
-15dB at 60Hz
True Semisphere
70 mV/Pa @ 1kHz
48V Phantom, 10mA
136dB SPL
Output:
XLR-3 (pin 2+)
1K between pins 2 & 3
Noise:
19.5dB SPL (A weighted)
Dual Red or Green
Phoenix or RJ45
8-28VDC @ 85-170mA
Momentary Digital Pulse
Black, White or Silver
Weight:
0.28 lbs. (125g)
IMB Dimensions
™
IMBL Dimensions
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