Wisdom Audio DCAB-1 User Manual

Page 25

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25

Important

Make sure your adjustments in the high pass (planar) section of the
DCAB-1 are all acting above the crossover frequency. Similarly, limit
your low pass (woofer) corrections to frequency below your selected
crossover frequency.

low level

This is the level (volume) control for the low pass (bass) section of the system. It
sets the overall level of the speaker below the crossover frequency.

bassis

The Bassis control is actually a complex filter that uses four parameters to ad-
dress a nearly universal problem in deep bass reproduction. This powerful filter
both tightens and extends the useful bass response of the system (and would be
a welcome addition to nearly any loudspeaker).

Almost all systems end up with a bit of a “bump” in their low frequency re-
sponse just before the point at which they roll off in the deep bass. (See Curve
A, below.) Sealed, acoustic suspension woofer systems like those Wisdom Audio
uses also have the ability to go deeper in the bass than they naturally do without
equalization. In short, they have low bass and power-handling capabilities in
excess of what they exhibit when left to themselves.

The Bassis filter allows you to offset the “bump” in the bass response with a cor-
responding dip, below which the response can be boosted to take advantage
of the extra capability of your Wisdom Audio Low Frequency Regenerator. This
curve is shown in Curve B, below.

The result of applying Curve B to the speaker’s native Curve A is an acoustic
response that looks like Curve C in the drawing below. The Bassis filter, when
set up properly, can extend the deep bass response of your system by as much
as an octave or more, while providing tighter bass by cleaning up that midbass
bump.

the effects of the Bassis filter

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