The BM2010 is a wide-range condenser microphone with a cardioid (pick-up pettern cardioid) polarpattern. It was designed for surface-mounted applications in
high-quality sound reinforcement and other demanding sound pickup situations Like Conferance room Class room Deposition hall Cort room etc. Its low-profile design
makes the BM2010 ideal for use in applications where minimum visibility is required.
The BM2010 can be powered from any external 9V to 52V DC phantom power source. A 25' (7.6 m) cable with TA3F and XLRM-type connectors is provided for use
between the microphone and electronics input.
This Microphone in Designed with the newest low-mass technology in the quest for superior performance. The charge is now on the fixed back plate, rather than the
moving element. With the A-T fixed-charge “back plate” construction, a gold-vaporized diaphragm just 2 microns thick (about 0.000079") can be used. This reduces
moving mass substantially, improving frequency response and transient response while reducing distortion.
Positioning a properly designed miniature unidirectional microphone centrally on a large, flat, unobstructed surface yields several distinct advantages. Directionality
is increased by 3 dB, promoting enhanced gain before feedback and further suppression of ambient noise. Sensitivity is increased for improved signal-to-noise ratio.
Phase distortion due to reflected sound energy from the boundary itself is eliminated.
The microphone element is enclosed in a rugged housing with a black finish. The rubber non-slip bottom pad minimizes mechanical coupling of surface vibrations to
the microphone.
Description
The symmetry and area of the mounting surface directly affect the sensitivity of the boundary microphone at low frequencies. Ideally, the mounting surface should
be circular; however, square or rectangular surfaces are most often used. If the mounting surface is rectangular, the smaller dimension tends to determine low-fre-
quency cutoff. The microphone should be centered on the surface and positioned with the front of the microphone facing the sound source along the longer dimension
of the mounting surface. The sound source should not be below, or higher than 60° above, the plane of the mounting surface.
Output is low impedance balanced. The balanced signal appears across Pins 2 and 3, while the ground (shield) connection is Pin 1. Output is phased so that positive
acoustic pressure produces positive voltage at Pin 2 in accordance with industry convention. DC phantom power (9-52 volts) must be applied equally to Pins 2 and 3,
with the ground for the power supply connected to Pin 1. This can be provided by a console or mixer with built-in phantom voltage or with the addition of an in-line
phantom power supply, such as the recommended HEINRICH CP8506 and AT8801 power supplies.
Operation and Maintenance
CARDIOID UNIDIREC
TIONAL
BOUND
AR
Y MICR
OPHONE
HEINRICH
BM2010
CARDIOID UNIDIRECTIONAL
BOUNDARY
MICROPHONE
