Altair FA-524, Owner'S Manual

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Q
3,1 3,2 3,3 3,4 3,5 3,6 3,7 3,8 3,9 4
5% RESISTORS -- -- 33 K -- -- 36 K -- -- 39 K --
1% RESISTORS 30,9 K 32,4 K 33,2 K 34,0 K 34,8 K 35,7 K 37,4 K 38,3 K 39,2 K 40,2 K
Q
4,1 4,2 4,3 4,4 4,5 4,6 4,7 4,8 4,9 5
5% RESISTORS
-- -- 43 K -- -- -- 47 K -- -- --
1% RESISTORS 41,2 K 42,2 K 43,2 K 44,2 K 45,3 K 46,4 K -- 47,5 K 48,7 K 49,9 K
Q 5,1 5,2 5,3 5,4 5,5 5,6 5,7 5,8 5,9 6
5% RESISTORS
51 K -- -- -- -- 56 K -- -- -- --
1% RESISTORS 51,1 K 52,3 K -- 53,6 K 54,9 K 56,2 K -- 57,6 K 59,0 K 60,4 K
Q 6,1 6,2 6,3 6,4 6,5 6,6 6,7 6,8 6,9 7
5% RESISTORS -- 62 K -- -- -- -- -- 68 K -- --
1% RESISTORS -- 61,9 K 63,4 K -- 64,9 K -- 66,5 K 68,1 K -- 69,8 K
Q 7,1 7,2 7,3 7,4 7,5 7,6 7,7 7,8 7,9 8
5% RESISTORS -- -- -- -- 75 K -- -- -- -- --
1% RESISTORS 71,5 K -- 73,2 K -- 75 K -- 76,8 K -- 78,7 K --
Q
8,1 8,2 8,3 8,4 8,5 8,6 8,7 8,8 8,9 9
5% RESISTORS
-- 82 K -- -- -- -- -- -- -- --
1% RESISTORS 80,6 K -- 82,5 K -- 84,5 K -- 86,6 K -- 88,7 K --
Q 9,1 9,2 9,3 9,4 9,5 9,6 9,7 9,8 9,9 10
5% RESISTORS
91 K -- -- -- -- -- -- -- -- 100 K
1% RESISTORS
90,0 K -- 93,1 K -- 95,3 K -- -- 97,6 K -- 100 K
One could see in the table, that there are Q values for which don't exist resistors. In
that case you should approach to the nearest Q.
As in the others cases, it is always advisable that use 1% resistors, since if use 5%
resistors, the Q has more variation with regard to the chart.
BAND GAIN VARIATION:
Apart from the gain, frequency and Q variations, you could vary the total band gain in
which it is insert the equalization point. This one could carry out varying the R1 resistor of
the equalizer card.
The formula that give us the gain is: G= 20* log (10000/ R1) or with R1 clear,
R1= 10000/ (10exp (G/ 20)), the gain in dB and the resistor in
Ω
. The factory value for R1 is
10 K
Ω
, that as you could check give a gain of 0 dB. For example, for a gain of 6 dB, the
resistor R1 would be of 5.1 K
Ω
5% or of 4.99 K
Ω
1%, and for a gain of - 6 dB, the resistor
R1 would be of 20 K
Ω
5% or of 20 K
Ω
1%. You should never put a less value of 2 K
Ω
for
this resistor.
You should be careful in the adjustment of high gains (great of 6 dB), since the cross-
over dynamic diminishes considerably.
The next table shows the value of R1 resistor for different gains: