Omnidirectional Boundary Microphone
(330-3020)             Connection and Operation       Faxback Doc. # 37908


To connect the microphone, be sure the microphone's ON/STAND BY/OFF switch
to set to OFF, then insert the microphone's 1/4-inch plug into the input
jack on the audio device (mixer, amplifier, or recorder).

CAUTION:  Always turn off the microphone before you connect it to, or
          disconnect it from, the audio device.

To turn on the microphone, set ON/STAND BY/OFF to ON.

To turn off the microphone for a short period of time (during an
intermission or between speeches, for example), set ON/STAND BY/OFF to
STAND BY.  This setting prevents an audible "pop" when you turn it on
again.

To turn off the microphone when you are finished using it, set ON/STAND
BY/OFF to OFF.


POSITIONING/MOUNTING THE MICROPHONE

You can set the microphone on any flat, level surface (such as a table
top).  Or, you can mount the microphone securely on almost any surface
(such as a lectern or wall) using a nail or screw (not supplied) and the
keyhole slot on the microphone's base.


CHOOSING A LOCATION

The microphone uses a "hemispherical" pick-up pattern, which means it picks
up sound equally from all directions within the space (hemisphere)
extending above and around the microphone.

The quality of the sound picked up by the microphone remains consistent no
matter what direction the sound comes from within the hemisphere.  For
example, the sound quality does not vary from side to side, or from top to
side.

NOTE:  The microphone might pick up some sound coming from the area behind
       its base (below the place of the mounting surface).  However, the
       sound quality is not as good as the sound picked up from above and
       to its sides.

Depending on how and where you plan to use the microphone, experimentation
and "critical listening" are usually the most reliable ways to find the
best location for it.  In other words, choose what you think is the best
location for the microphone, then listen to how it sounds there.

Follow these suggestions to achieve the best performance, improve low
frequency sound pick-up, and maximize the microphone's range.

     Position the microphone on a solid, flat surface.

     Be sure the top of the microphone is in the sound source's "line of
     sight" (so the person(s) speaking can see it).

     Leave at least 1 foot (0.3 m) of clear space all around the
     microphone.

     If you are using two or more microphones, position them at least 20
     feet (6 m) apart.

     Avoid positioning the microphone on carpeting or other sound-absorbent
     material.

     NOTE:  If you must position the microphone on a carpeted surface,
            place a 4-foot square piece of plastic or wood on the carpet
            first, then mount the microphone on top of the plastic or wood.


MOUNTING EXAMPLES

ON A TABLE TOP

Placed on a flat, level table top, the microphone picks up sound equally
well from any location around the table.


ON A LECTERN/PULPIT

Mounted on a slanted lectern or pulpit, the microphone is hidden from the
audience and does not block the view of the person speaking.


ON A STAGE/PLATFORM

Mounted on the perimeter(s) of a raised stage or platform (if the
stage/platform is above the audience's line of sight), the microphone(s)
are hidden from the audience and do not pick up most audience sounds.


INSIDE A GRAND PIANO

Mounted inside the lid of a grand piano (with the top of the microphone
facing the piano's strings), the microphone is hidden from the audience and
isolates the piano's sound.  To emphasize the bass and treble sounds, mount
one microphone over the bass strings and another over the treble strings.

(YO/km-02/06/1997)

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