Using The Xcard; Customizing The Xcard - Rockford Fosgate 250.1 Operation & 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 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.
C
U S T O M I Z I N G T H E
The crossover point can be altered by changing the 4 resistor values. Use the following formula to select the
appropriate resistor value to be placed on the XCard.
3386
= R (in k ) for .047 f cap
f o
7234
= R (in k ) for .022 f cap
f o
XC
ARD
High-Pass Low-Pass
HP
LP
HP
XC
Crossover Card
High Pass
FULL
Low Pass
Full Range
Full Range
LP
FULL
A R D
The actual formula is: R =
Where: R =
f o = desired crossover frequency
c = capacitor in farads
ex: .047 x 10 -6 for .047mf cap
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