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0.0..
12 dB/OCTAVE
PASSIVE CROSSOVER CHART
12 dB/octave
hiah
pass
12 dB/octave
lowpass
KEY
Ll
=
high quality (DCR
<
1 ohm) inductor/coil
Cl
=
non-polarized 50
v
(or greater) capacitor
FREQ.
80
HZ
IOOHZ
130 Hz
2wHZ
260
HZ
400
Hz
6OO
Hz.
600
Hz
,wo
HZ
,200 Hz
,600
Hz
4OCQ
Hz
2 ohms
Ll
Cl
5.5
mH
660
uF
4.7 mH
3.3
mH
2.2
mH
1.6 mH
1.1
mH
0.76
mti
0.5
mH
0.47 mH
0.33 mH
0.27
mH
0~10
mH
560
pF
400 pF
3W
pF
2W
PF
150
pF
loOtIF
68
)IF
6QPF
44 pF
30
IF
15pF
4 ohms
Ll
Cl
It
mH
330
PF
9.1
mH
270 pF
6~6
mH
2W
pF
4.7
mH
15OpF
3.6
mH
1OQwF
2.2
mH
68
pF
I,5
mH
47
pF
LOmH 33 ,,F
0.9
mH
27
vF
0.75
rnH
22
PF
0.50
mH
l6PF
0.22
rnH
66llF
,
8 ohms
Ll
Cl
l
.0..
CROSSOVER ADJUSTMENTS
In
most
car audio installations, there is a tendency for a “midbass boom.”
Because of their interior dimensions, most cars will resonate or ring at these
midbass frequencies. If we design the system so there is less musical
information in this region, the fin?. response is
very
smooth and natural
sounding.
22mH
16mH
15mH
9.1
mH
6.6
mH
4.7
mti
3.0
mH
2~0
mH
1.6
mtl
1.5
mH
t.OmH
3.47 mH
16OkF
t5OpF
too
,,F
75
IF
50
NF
33
UF
26 pF
t5pF
13pF
1tpF
6,6 pF
33pF
The
REFERENCE300sx
incorporates
electronic crossover.
The high and low pass portions of the
crossover can be set independent of
one another.
Below is a chart of S.I.P. values which
can be used for changing the factory
preset
C~OSSOVB~
points for the
FREQUENCY RESISTOR VALUE
COLOR CODE
53
Hz
73 Hz
89 Hz
107
Hz
145
Hz
1%
HZ
286 Hz
465 Hz
8M)
Hz
30 K
n
22Kn
18KR
15KR
11
Kcl
6.2Kn
5.6
KfI
3.3 K
LI
2.0 K
0
Green-Green
Green-White
Vblet.Green
Violet-White
NOTE: The following formula may be used to determine values in creating
?ustom” resistor packs. The frequency is equal
to
1,600,OOO
divided by the
Chdiv;dual
resistor value, or 1.600.000
I
R
ohms
=
X
HI.
To make a custom
1
S.I.P.,
use 4 identically valued resistors of 2% or tighter tolerance.
See
Ihe
drawing
of
fhe
S.I.
P.
fir
more
information.