Crown Audio P.I.P.-XOV User Manual
Page 7
Page 8
P.I.P.-XOV
The formulas shown below calcu-
late the correct component values
for the low-pass and high-pass fil-
ters. The value of constants K1, K2
and K3 determine the filter type.
Notice that the value of resistors
R1, R2 and R3 will always be equal.
The same is true of capacitors C4,
C5 and C6. Resistors R1–R5
should always be greater than 2 K
ohms and less than 330 K ohms.
Resistor R6 should always be less
than 1 M ohm. The value of ca-
pacitors C4, C5 and C6 can be
any arbitrary value so long as it
allows R1–R6 to meet the above
criteria.
All resistors should have a 1% tol-
erance and should be rated for
0.25 watt. All capacitors should
have a 10% tolerance and be of
the film type.
Fig. 3.2 Resistor / Capacitor Selection Values
Where:
π
= 3.14159
F
L
= Low-pass crossover frequency (Hz)
F
H
= High-pass crossover frequency (Hz)
R
= R1 = R2 = R3 (ohms)
C
= C4 = C5 = C6 (farads)
Note: R1–R5 must all be > 2 K ohms and < 330 K ohms
and R6 must be < 1 M ohm. All resistors are 0.25 watt, 1%
and all capacitors are 10% film.
Filter Type
K1
K2
K3
Bessel
0.988
1.423
0.2538
Butterworth
1.392
3.546
0.2024
0.1 dB Chebyshev
1.825
6.653
0.1345
0.25 dB Chebyshev
2.018
8.551
0.1109
0.5 dB Chebyshev
2.250
11.23
0.0895
1 dB Chebyshev
2.567
16.18
0.06428
2 dB Chebyshev
3.113
27.82
0.03113
3 dB Chebyshev
3.629
43.42
0.02533
K1
2 F R
π
L
C1 =
K2
2 F R
π
L
C2 =
K3
2 F R
π
L
C3 =
LOW-PASS
FILTER
1/K1
2 F C
π
H
R4 =
1/K2
2 F C
π
H
R5 =
1/K3
2 F C
π
H
R6 =
HIGH-PASS
FILTER