25
DISTRIBUTION AMPLIFIER/ZONE MIXER/MIC SPLITTER DA-410.
GAIN
+6 dBv
+4 dBv
+2 dBv
-2 dBv
-4 dBv
-6 dBv
5%
5,1 K
Ω
6,2 K
Ω
7,5 K
Ω
12 K
Ω
16 K
Ω
20 K
Ω
R1
1%
4,99 K
Ω
6,34 K
Ω
7,87 K
Ω
12,4 K
Ω
15,8 K
Ω
20 K
Ω
NON STANDARD CONFIGURATION EXAMPLES
With the parametric equalisation point, you can also simulate shelving and notch filters.
In order to carry out a shelving filter, you should select the frequency 35 Hz for low
frequencies or 16 kHz for high frequencies and a very small Q - 0.4 for example. The left
picture shows different equaliser card examples simulating shelving filters for low and high
frequencies, at different gains and attenu5, +10, +15, -5, -10 & -15:
You could also make a notch filter type, selecting the highest Q (15) that the equaliser
card allows. The right picture shows a notch filter type with 15 dB of attenuation at 1 kHz:
PLACING AN EQUALIZER CARD
Before placing the equaliser card you should adjust it, for this it is recommended that
read the previous sections carefully, if you haven't done yet.
In order to place an equaliser card in the main board, follow the next steps:
Turn off the distribution amplifier and
disconnect it from the mains.
Remove the connector jumper where you want
to insert the equaliser card (the connectors where
you could insert the equaliser card are indicated in
the first paragraph of the equaliser card section).
Insert the equaliser card in the connector, guiding the printed circuit board toward the
component overlay indication in the main board. Take care to insert the connector carefully,
and don't move it forward, behind, left or right. All the main board male connector contacts
should join in the female equaliser card connector.
