User Manual

The Excursion Graph in Detail
(Vented Box)
 At 125 Watts, excursion exceeds Xmax, but
only at the very lowest frequencies
– A subsonic filter should be used and should be set
to a frequency a little lower than Fb (you can find
Fb on the previous page). 30Hz is a good point to
use.,
– The subsonic filter will reduce the power at the
lowest frequencies and REDUCE the excursion.

At frequencies above Fb, 125 Watts only
7

At frequencies above Fb, 125 Watts only
drives the woofer to about 4mm excursion.
– More power can be used on the vented box, so
long as a subsonic filter is applied.
 Cone excursion is REDUCED at the
frequency where the port plays.
– The woofer doesn’t move as far because the
pressure inside the box is MUCH higher at Fb.
Most of the sound comes from the port.
 A vented box will play LOUDER than a
sealed box and It will handle More Power.
– A vented box is a MUCH better choice, if the
customer will devote the additional space for the
box.