ADAU1452 Q factor value will affect the Crossover result?

Hello guys,

I meet one problem which is the "Higher Q factor" affect the crossover output result.

Here is mine part of the DSP structure:

from the above figure, the 10 bands EQ are before the crossover, and the final result will output Low path(red line in AP) and the High path(blue line in AP)

if I use the lower Q factor value, the output looks fine, like below:

1KHz boost 5 dB and the Q is 0.7

20KHz boost 5 dB and the Q is 0.7,

from the AP Frequency Response result:

the result looks fine on both path, all smooth.

but if I change the 1KHz Q factor to 12 and the 20KHz Q factor is same as the 1KHz,

the result will like below:

the crossover frequency is at 2.1KHz, if Q factor value is 12,

the low path frequency line(red line) result is correct, but the high path frequency(blue line) will be affected by the low path EQ boost, the blue line appear a little peak on the 1KHz.

from the 20KHz result is same as the 1KHz, the red line will appear a little peak.

Does the Q factor has a maximum value to avoid affecting the other path(to get the smooth result)?

or is there some limitation when the EQ tuning before the Crossover?

Thanks!

Alvis.

Audio Signal Processors

adau1452

adau1452 sigmastudio

SigmaDSP Audio Processors

crossover

Q factor

peaking filter

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