Earthworks IMB30 User's Installation Manual

Dimension Drawings
IMB30
Frequency Response & Polar Response
The frequency response is measured with the microphone installed flush in a 3' by 3' 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 bound-
ary. The frequency at which the boundary's area starts to influence the low end roll off can be
calculated by F=750/A, where A is the area of the boundary.
IMB30 & IMBL30 Frequency Response
45 Degrees Incidence

Specifications

Frequency Response: 60Hz -30kHz ±2dB @ 45° incidence
Integrated Low Cut Filter: -15dB at 60Hz
Polar Pattern: True Semisphere™
Sensitivity: 70mV/Pa @ 1kHz
Power Requirements: 48V Phantom, 10mA
Max Acoustic Input: 136dB SPL
Noise: 19.5dB SPL (A weighted)
Earthworks, Inc. • 37 Wilton Road, Milford, NH 03086, USA
Email: info@earthworksaudio.com • Phone: +1-603-654-2433 • Fax: +1-603-654-6107
IMBL30
True Semisphere Polar Response
™
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 Activation: Momentary Digital Pulse
Microphone Color: Black, White or Silver
Weight: 0.28 lbs (125g)
IMB30 & IMBL30
30kHz Boundary Microphones
User & Installation Guide