Using The Xcard - Rockford Fosgate punch 40X2 Operating & Installation

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
100Hz 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 ampli-
fier. Firmly, but carefully, plug the card into the socket.
The crossover point can be altered by changing the resistor value. 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 f o c
Where: R =
XC
ARD
High-Pass
LP
HP
= R (in k ) for .047 f cap
= R (in k ) for .022 f cap
1
f o = desired crossover frequency
c = capacitor in farads
ex: .047 x 10 -6 for .047mf cap
Low-Pass
HP
LP
– 12 –
Full Range
FULL
Crossover Card
High Pass
FULL
Low Pass
Full Range
a O
p
d
e
v
r
a
a
n
t
c
i
e
o
d n