Specifications

Free-standing mounted microphones (mounted

away from large surfaces) come in a variety of styles

suited for different fixed settings. These range from full-

size microphones, on heavy-duty stands, to miniature

types on unobtrusive goosenecks or booms, to hanging

microphones of any size. Mounted microphones are

generally selected for permanent installation although

many handheld types may be placed in mounts and

removed as needed. Shock isolation is still essential if the

stand is likely to be moved or is mounted on a vibrating

stage or hollow lectern. Windscreens are necessary for

close-up speech or if used outdoors. Again, appearance

is often a primary factor in the selection of mounted

microphones.

Boundary or surface-mounted microphones are also

used in fixed positions but the surface to which they are

attached is integral to the operation of the microphone.

These microphones are most successfully mounted on

existing surfaces, such as tables, floors, walls, or ceilings,

to cover a certain area. They depend to some extent on

the acoustic properties of the mounting surface (size,

composition, orientation) for their frequency response and

directionality. However, they offer a very low profile and can

minimize certain acoustic problems which are due to

reflected sound. Appearance and physical environment

play an important part in the selection of boundary

microphones.

It should be noted that almost any combination of the

four other microphone characteristics can be found in any

of the physical designs mentioned here. That is, most

of these designs are available in a choice of operating

principles, frequency responses, directional patterns, and

electrical outputs.

Though not intrinsically related to the other four areas

of microphone specification, the physical design is no less

important in the selection process and, indeed, is often

one of the first choices dictated by the application. In any

case, the other microphone specifications should be just

as carefully chosen to satisfy the basic acoustic and

electrical requirements of the application. Ultimately,

all five areas must be properly specified to yield the best

selection.

MEETING FACILITIES

Audio Systems Guide for

West Virginia Senate Caucus Room