AKG C 400 BL User Instructions page 16

1. Description
The C 400 BL and C 400 BL-1 are versatile hypercar-
dioid condenser boundary microphones. Their fre-
quency response has been designed for optimum intel-
ligibility of speech. Thanks to their small dimensions,
the microphones can be placed so as not to distract the
speaker.
The two microphones are acoustically identical and of
the same dimensions. The C 400 BL is fitted with a
threaded phantom power adapter with an integrated
XLR connector. The C 400 BL-1 comes with a 1/8"
mono jack plug. For details refer to section 4. Power-
ing. Sections 1, 2, 3, and 5 apply to both versions of
the microphone.
When lying on a table or lectern the microphone ele-
ment is very close to a "boundary" (the tabletop). This
design prevents any comb filter effects or other acous-
tic interferences which would normally exist at micro-
phone positions close to reflecting surfaces.
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The supporting surface (tabletop, lectern, etc.) limits
the pickup area. In other words, the microphone will
only pick up sounds arriving from above the support-
ing surface. (See the dashed lines in figs. 1 and 2.) The
optimum pickup angle is between 0° and 50° relative
to the supporting surface.
With its dark color, the microphone is very inconspic-
uous and therefore also suited for recording and sound
reinforcement use on theater stages and in conference
rooms where "invisible" microphones are required.
2. Uses
Before installing the microphone as described in sec-
tion 3, find the optimum position and decide whether
you want to repaint the microphone to blend it in with
its surroundings.