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FIR as a Highpass filter 7 months 1 week ago #58610

  • The4thMan
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Is it possible to make a Highpass filter let's 48db per Octave at 30hz using the FIR slot on the 2x4HD ?

I'm asking because I need to protect my subs and let the input signal reach my Buttkickers without using PEQ or Xover as they are already used to align the subs flat.

If I can do it, will it affect timing between the subs and the rest of the system (speakers and BK) currently everything is spot on and I would hate to mess that.

Thanks 

Chris 

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FIR as a Highpass filter 7 months 5 days ago #58652

  • planetti
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Hi Chris,

I am afraid that it does not work as you want.

The 2x4HD has only a very limited number of FIR-taps available which cannot provide such a steep subsonic filter of 48dB at 30Hz. You may simulate the FIR capabilities and limitations by rePhase: doing this it will show you that it could be possible to provide the low pass crossover by the FIR section, then some PEQs/xover/biquads are free to provide your subsonic filter.

But be aware that activating the FIR section will cost you a millisecond delay for calculation in minimum phase filters, when using linear filters (centered) additionally a further amount of milliseconds will be there. Thus your spotted timing should be checked up ...

Regards
Uli

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FIR as a Highpass filter 7 months 1 day ago #58776

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Thank you for your reply.

I ended up realigning my subs to free some PEQ slots for a BW 24dB/oct high pass. It turned out to be much simpler than trying FIR. 

 

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FIR as a Highpass filter 7 months 1 day ago #58777

  • Ultrasonic
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I ended up realigning my subs to free some PEQ slots for a BW 24dB/oct high pass. 

 

Why not just do this directly using the Xover option on your 2x4 HD? Or indeed a LR 48 dB/octave high-pass filter? You won't 'use up' any PEQ slots that way.

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Last edit: by Ultrasonic.
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