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Economy Mode
Limited Space Mode
moves forward creating a positive pressure wave, this same motion creates a negative
pressure at the back of the woofer. If these two waves combine due to the lack of a wall
separating the front of the speaker sound from the back, the output from the woofer is
effectively canceled thus substantially reducing the bass output of the speaker. This wall is
absolutely necessary and is referred to as an acoustical "baffle". It can be accomplished
using a box of some kind or simply the rear package shelf of an automobile to isolate the
front and back waves of the speaker.
THIELE-SMALL PARAMETERS
Every woofer has its own electromechanical characteristics which are called THIELE-SMALL
parameters. The three most important parameters include RESONANT FREQUENCY ("
the frequency where the speaker moves with the least mechanical resistance), TOTAL
VOLUMETRIC COMPLIANCE ("Vas" - the equivalent volume of air that the woofer cone can
displace for a given power input). Using these parameters we can then calculate an
optimum box volume for a particular woofer and reasonably predict its frequency response.
e movement 0
e woofer cone back and forth. If
HI-SPL Mode
a woofer cone
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