Rockford Fosgate 400x4 operation manual I N G T H E Xcard

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. 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 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	The actual formula is:
fo
			R =	1
7234 = R (in kΩ		) for .022∝ f cap		2π foc

fo

R1

Crossover Card

R2	Pass	R1
Low Pass
Full Range

FULL

R2

Where: R = ohms

fo = desired crossover frequency c = capacitor in farads

ex: .047 x 10-6for .047∝ f cap

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