Rockford Fosgate 125.2 - Manual (Page 17)

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3386
fo
= R (in k
Ω
) for .047
µ
f cap
= R (in k
Ω
) for .022
µ
f cap
7234
fo
Where: R =
Ω
fo = desired crossover frequency
c = capacitor in farads
ex: .047 x 10-6 for .047
µ
f cap
Crossover Card
High Pass
Low Pass
Full Range
R1 R2 R1 R2
FULL
The crossover point can be altered by changing all 4 resistor values. Use the following
formula to select the appropriate resistor value to be placed on the XCard.
U
SING THE
XC
ARD
1
2
π
foc
The actual formula is:
R =
Low-Pass Full Range High-Pass
FULL ↕ HP
➝
➝
LP
HP
➝
➝
LP
The crossover functions are controlled through the use of an XCard and can
be set for high-pass, low-pass or full range operation. The XCard shipped with
your amplifier is set for Full Range. Each crossover card has two faces: one
face operates Full Range, the other has arrows to indicate the edge for
selecting HP (high-pass) or LP (low-pass) operation. Orient the card with the
desired operating edge, indicated by the arrow, toward the socket terminals
inside the amplifier. Firmly, but carefully, plug the card into the socket.
a
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v
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