Filter; Graphics - Monacor CAAD 3.0 Handbuch

The indications regarding the box dimensions are to be
interpreted as follows:
Width inside: inside box width
Height inside: inside box height
Depth 1 inside: inside box depth at the
beginning of the channel
(at the driver)
Depth 2 inside: inside box depth at the bending of
the channel (center of the channel)
Depth 3 inside: inside box depth at the end of the
channel (channel exit)
Horn
Effective cone area (SD) cm
tion the size of the cone area is decisive for the size
of the throat area (initial area) of the horn.
Lower cut-off frequency (fgu): Insert the desired
lower cut-off frequency of the horn. It has a decisive
influence on the horn length. The lower cut-off fre-
quency should always be chosen higher than the
resonance frequency of the driver.
Higher cut-off frequency (fhm): In this field insert the
desired higher cut-off frequency of the horn. If you
wish to have calculated the mass-depending (cone
mass) higher cut-off frequency, insert 0 (zero).
Pressure chamber volume (Vc) in l: The pressure
chamber volume is a cabinet chamber between
speaker and horn throat. By this the higher cut-off
frequency is limited to avoid distortions by partial
vibrations.
The next value to insert is the desired room positon of
the horn. This is only of importance for bass horns
because for this horn type the mouth area and by this
also the length of the horn decisively depend on the
room position. Example:
Horn position
1: Floor
2: Floor/wall
3: Floor/(wall) corner
Click at the input field beside the horn position. A win-
dow is opened in which you can choose the desired
position.
The throat area (Ah) is the initial area of the horn
ahead of the speaker.
The mouth area (Am) is the end area of the horn at the
funnel end.
The horn constant (k) fixes the bending of the horn
(horn shape) and by this also the horn length. A greater
horn constant results in a greater opening angle and a
shorter horn length.
The closed box volume (Vb) is a closed box onto which
the driver acts backwards. It is exactly calculated like a
simple closed box.
The indicated SPL gain in dB is just a calculating fac-
tor. This theoretical value is slightly reduced due to fric-
tion losses and reflections at the horn mouth.
To calculate the horn shape, the following factors are
necessary:
2 : For the horn calcula-
Mouth area Horn length
18 940 cm 2 207.9 cm
9 470 cm 2 169.9 cm
4 735 cm 2 132.0 cm
Number of graduations: The total horn length is subdi-
vided in equal graduations. At these points CAAD
3.0 states the horn dimensions in cm. The distance
of the graduations is automatically calculated.
Distance of graduations: If you wish to place the sec-
tions at a special distance from each other, insert
this distance in cm. The number of graduations is
then calculated automatically.
Horn area
Circular: CAAD 3.0 calculates a circular horn. At
distances (xm) in cm from the horn throat, which
have been defined before, the corresponding areas
(xf) in cm 2 and the respective radius (xr) in cm are
calculated.
Square: CAAD 3.0 calculates a horn with a square
horn opening. At distances (xm) in cm from the horn
throat, which have been defined before, the corre-
sponding areas (xf) in cm
(ax) and (bx) in cm are calculated.
Side ratio: Here you can fix a special side ratio in case
of square mouth areas of the horn. Ratios from
0.0001 to 99 999 and from 99 999 to 0.0001 can be
calculated (if it makes any sense or not). At dis-
tances (xm) in cm from the horn throat, which have
been defined before, the corresponding areas (xf) in
cm 2 and the respective sides (ax) and (bx) in cm are
calculated.
One side of constant value: If the horn, e. g. with bass
horns, is not to exceed a certain width, one side can
be fixed as a constant value in another window. Now
only one side (bx) is calculated. At distances (xm) in
cm from the horn throat, which have been defined
before, the corresponding areas (xf) in cm
respective sides (ax) and (bx) are calculated.
A list with the above described parameters can be dis-
played by activating the order field "List horn dimen-
sions". This list can also be printed via the menu item
"Print list" on a printer.

4.5 Filter

With this menu item you activate the filter editor. Here
you can have calculated the crossovers of 1st to 4th
order in 2-way up to 4-way versions. Besides you can
have calculated an equalization for the impedance
increase at the resonance frequency resp. at rising fre-
quency. In this editor also the sound pressure of diffe-
rent drivers can be matched with each other. The filter
editor is exactly described further below.

4.6 Graphics

Sound pressure curve: After calculation of one
speaker box the sound pressure curve and the impe-
dance curve of the system can be displayed. With
transmission line boxes and horn systems these
curves are not calculated. To compare curves of two
different box calculations, the curve which has just
been calculated can be saved by pressing the key
"s" (like save) and, if necessary, it can be loaded
again by "l" (like load) to be displayed on the gra-
phics screen. The loaded comparison curves are
displayed in red colour.
2 and the respective sides
2 and the
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