Effective Piston Area (Sd): (measured in square inches or meters) The active radiating area of a speaker cone, including that part of the surround which displaces sufficient air to produce a measurable acoustic output.

 

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Effective Piston Area (Sd): (measured in square inches or meters) The active radiating area of a speaker cone, including that part of the surround which displaces sufficient air to produce a measurable acoustic output.

Marine Protected Area: A conservation geographic unit designed to protect crucial communities and to provide reproductive reserves for fisheries that hopefully will disperse over wider areas.

Major Trading Area (MTA): Usually composed of several contiguous basic trading areas. A service area designed by Rand McNally and adopted by the FCC. There are 51 MTAs in the United States.

Major Land Resource Area (MLRA): Major land resource areas are geographically associated land resource units delineated by the Natural Resources Conservation Service and characterized by a particular pattern that combines s . . . View Full Definition

Metro Area: A U.S. Government definition: the counties that comprise each Standard Metropolitan Statistical Area.

Metropolitan Statistical Area (MSA): One of 306 geographic regions, primarily urban areas, in the United States that are used as license areas in the cellular frequency band. Originally, two wireless operators were licensed in each MSA.

Out-Of-Area Benefits: Benefits the health plan provides to covered persons for covered services obtained outside of the network service area. The details of such benefits will vary from plan to plan.

Nuclear Area: In prokaryotic cells, a region containing the cells genetic information. Unlike the nucleus in eukaryotic cells, it is not surrounded by a membrane.

Midcourt Area Marker: One of four lines extending 3 feet in from a sideline, 28 feet from and parallel to a baseline.

Local Calling Area: The geographical area that a customer may call without incurring toll charges.