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3386
f
o
= R (in kΩ) for .047µf cap
= R (in kΩ) for .022µf cap
7234
f
o
Where: R = Ω
f
o
= desired crossover frequency
c = capacitor in farads
ex: .047 x 10
-6
for .047mf cap
Crossover Card
High Pass
Low Pass
Full Range
R1
R2
R1
R2
FULL
C1
C2
C1
C2
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.
U SING THE XCARD
1
2πf
o
c
The actual formula is:
R =
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 ampli-
fier. Firmly, but carefully, plug the card into the socket.
– 13 –
CUSTOMIZING THE XCARD
a
d
v
a
n
c
e
d
O
p
e
r
a
t
i
o
n
Low-Pass Full RangeHigh-Pass
FULL
↕
HP
➝
➝
LP
HP
➝
➝
LP