Using The Xcard - Rockford Fosgate PUNCH 40.2 Operations & Installation Manual

U
S I N G T H E
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.
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.
3386
f o
7234
f o
The actual formula is:
R =
2
Where: R = Ω
XC
ARD
High-Pass
HP
Ω
) for .047µ µ µ µ µ f cap
= R (in k
= R (in kΩ) for .022µf cap
1
π
f o c
f o = desired crossover frequency
c = capacitor in farads
ex: .047 x 10 -6 for .047mf cap
Low-Pass
LP
– 14 –
Full Range
FULL
Crossover Card
High Pass
FULL
Low Pass
Full Range
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