Crown CM-30 Application Manual page 5

Models MB-1, MB-2 and MB-4E require a Crown
MB-100 or MB-200 interface. The MB-200 inter-
face allows remote sensing of switch closure, so it
can be used with a video switcher. Each interface can
take up to four mics.
An example of an MB mic: The MB-2.
Hanging mics
Normally, these mics are hung over the students in a
distance learning setup.
The Crown hanging mics are the CM-30 and CM-31.
Each mic rejects sound from the rear, and rejects
muddy-sounding room acoustics.
CM-30
CM-30 electronics mount in an electrical box in the
ceiling. CM-31 electronics are in a tubular interface
which you plug into a microphone cable.
Mics hanging over a conference table do not work
well compared to table-top mics. Hanging mics are
too far from the talkers for clear pickup without feed-
back.
Lectern mics (gooseneck mics)
These mics are permanently installed on a lectern,
student desk, or conference table. Compared to
table-top mics, lectern mics pick up less paper shuf-
fling and less room acoustics because the mics are
closer to the user. Lectern mics, however, are more
conspicuous and are more susceptible to breath pops.
LM-300A and LM-301
Listed below are the Crown lectern mics:
LM-300A: Miniature gooseneck. Can be shock
mounted with LM-SM shock mount.
LM-300AL: Same as LM-300 but 5" longer.
LM-201: Rugged ball and socket swivel, built-in
shock mount.
LM-301A: Fastens to a flange on the lectern; allows
cable to exit down or out the side.
LM-SM: Shock mount for models LM-300A, LM-
300AL, and LM-301A.