Rockford Fosgate 40X2 manual I N G T H E Xcard, 3386, Actual formula is, = R in kΩ For .047∝ f cap

U S I N G T H E 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 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.

High-Pass

➝LP		➝
	HP

Low-Pass

➝HP LP➝

Full Range

FULL ↕

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	= R (in kΩ	) for .047∝ f cap
fo
7234 = R (in kΩ		) for .022∝ f cap
fo

AO

DP

VE

AR

A N T C I E O

D N

The actual formula is:
R =	1	R1
	2π foc

Where: R = Ω

fo = desired crossover frequency c = capacitor in farads

ex: .047 x 10-6for .047mf cap

Crossover Card

R2	Pass	R1
Low Pass
Full Range

FULL

R2

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