How to extend the high pass filter below 20hz in DCX2496 - Page 2

I would suggest that anyone attempting these types of filters and depending on them to keep their equipment safe should measure and verify that the settings are producing the expected result. I have attempted a lot of this sort of thing and have noted that once you start combining multiple DSP effects there can sometimes be unexpected response artifacts that are not expected. Sometimes as much as a one decimal place change in one parameter can cause them. Good luck out there.


Here is a HPF filter with the DCX that is approximately a 24dB octave BW HPF at 13.5Hz. I use this for my Gjallarhorns and DTS-10's when I had them.

This is the DCX settings for it...

24dB octave BW HPF at 20Hz
24Hz 12dB HP Shelf filter -15dB
20Hz 12dB LP Shelf filter +1.5dB
21.5Hz BP filter Q of 2.0 -1.8dB

I could not get anything to be much lower effectively without burning through a lot of EQ bands and getting much more complicated. This one is actually -3dB at 13.5Hz (Note the scale used is only 1dB a division.) so it is rather low with few EQ bands used.

Well, I have to give Kudos to LTD02 for this idea!



The above graph is a measurement from my two 11Hz LLT subwoofers. One sweep is with no filters, one is with the HP+HS filter enabled. The DSP is the DSP integrated into my Behringer iNuke3000DSP.

Settings:

Input gain: +3db
High Pass: 20Hz, Butterworth 12db/oct
High Shelf: 20Hz -12db gain 12db/oct.

Verified through testing. It's not just theory any longer.