![]() ![]() ![]() The term “isobaric” points to the somewhat erroneous notion that the air pressure in the sealed chamber between the loudspeaker is constant (the "isobaric" condition), when in fact there will be small changes due to the differences in the drivers technical parameters and the air that each is pressurising. In isobaric designs, the two drivers are placed either "cone to magnet" and wired in phase with one another or "cone to cone" or "magnet to magnet" and wired out of phase with one another so that their cones move together when driven with an audio signal. the outer cone faces another outer cone and the drivers are wired out of phase. In a subwoofer, where the mid-range output is not needed, the optimum arrangement is front to front, i.e. The volume of this "isobaric" chamber is usually chosen to be small for reasons of convenience and to better couple the drivers. Two identical loudspeakers are coupled to work together as one unit: they are mounted one behind the other in a casing to define a sealed chamber of air in between them. The image above shows a sealed enclosure vented enclosures may also use the isobaric scheme. Isobaric loudspeaker in a cone-to-magnet (in-phase) arrangement. ( August 2012) ( Learn how and when to remove this template message) Unsourced material may be challenged and removed. Please help improve this section by adding citations to reliable sources.
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