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DELAY CARD
It is available a delay card as option, with two basic configurations: 2 ms (70 cm) valid
up to 2 KHz and of 500 µs (17 cm), valid up to 8 KHz.
Each crossover way could have a delay point. The next table show the main board
connectors where you could insert these delay cards, depending on the way in which you
want to introduce the delay:
DELAY CARD INSERT CONNECTORS
SUBWOOFER
LOW CH1 MID CH1 HIGH CH1 LOW CH2 MID CH2 HIGH CH2
FA-72
J2
J5
J8
J11
J14
J17
J21
FA-52
J5
J8
--
J11
J14
--
J17
If any of these connectors doesn't have an equalizer card ,
should have a jumper in the connector as you can see in the picture,
since of if this way doesn't have this jumper the signal would remain
off and therefore that way wouldn't work. Keep in mind this circum-
stance whenever you change, update or place for the first time an
equalizer card or a delay card. Of course in order to insert the equal-
izer or delay card, you should remove the connector jumper in which
you want to place the equalizer or delay card.
As seen in the main board component overlay, the jumper goes
placed beside an indication. It is important notice well where the
jumper goes located, because place it in other location could cause a
short circuit in the power supply, and cause the crossover break.
DELAY CARD CONFIGURATION:
The next picture shows the delay card component overlay. As seen in the picture, there
are a switch of 8 positions called DS1 and one trimmer potentiometer called P1.
The first delay step (the switch placed at position 1) it is lineal, and it have the range of 0
to 250 µs in the case of the 2 ms (70 cm) delay card and of 0 to 62.5 µs in the case of the 500
µs (17 cm) delay card. This step is controlled by the potentiometer P1. The next steps (switch at
positions 2 to 8), are discreet of 250 µs in the case of the 2 ms (70 cm) delay card and of 62.5
µs in the case of the 500 µs (17 cm) delay card.
The potentiometer P1, rotated totally to the left (delay card top view ) gives us the mini-
mum delay, and rotated totally to the right the maximum one.
The next table shows the different delays of the two standard cards, for the different
positions of the switch DS1, depending on the position of the potentiometer P1:
