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What is the subwoofer?

Speaker for bassSubwoofer (3way) [middobasu] (4way) etc. with super-subwoofer squawker and crossing for super-bass. A lot of corn types of the radiation type are used directly.

The band of which it takes charge

It about is a super-subwoofer and 60hz from several hz.
It about is a subwoofer and 20-500-4000hz.
It about is a subwoofer of [middobasu] and 150-800-1000hz.

By the way, the small caliber backing loading horn (Swan etc.) reinforces the band around here with the horn of the backing loading and takes charge.

Width of swinging of subwoofer

When the caliber becomes half, four times the width of swinging are needed to obtain the same sound pressure level. It assumes if there was a unit of the centimeter the centimeter ten 20 40 centimeter and it is assumed that 60hz is reproduced.

The shaped width is needed by 16 times 160mm in case of four times the 40mm�10 centimeter 10mm�20 centimeter in case of 40-centimeter unit.

Disadvantage and technical accident [shisa] of large caliber subwoofer

The vibration board becomes heavy and a super-huge subwoofer has the disadvantage described next though it is theoretical and possible to reproduce the reproduction limit in a low region by a low warp in the large caliber subwoofer.

Decrease in efficiency
The standing up feeling deteriorates.
A necessary rigidity cannot be secured and the division vibration is caused.

Even the commercial item is general the subwoofer up to about 30 centimeters.