Rockford Fosgate 55.2, 75.2, 125.2 Using The Xcard, 3386, 7234, = R in kΩ for .022μf cap, 2 πf oc

USING THE XCARD

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.

High-Pass

➝LP HP➝

Low-Pass

➝HP
	LP➝

Full Range

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.

3386	= R (in kΩ) for .047μf cap
fo
7234	= R (in kΩ) for .022μf cap
fo

AO

DP

VE

AR

A N T C I E O

D N

The actual formula is:

R =	1
	2πfoc

Where: R = Ω

fo = desired crossover frequency c = capacitor in farads

ex: .047 x 10-6for .047μf cap

R1

Crossover Card

R2	Pass	R1
Low Pass
Full Range

FULL

R2

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