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[Falconer72]

Hi! Can you add the allpass filter to the equalizer filters? I can't use the external DSP without it. I can handle everything else within the DSP Studio but this feature is really missing.
Thank you.

[JimH]

Could you explain why you need it?

[mattkhan]

It's a longstanding request, e.g. https://yabb.jriver.com/interact/index.php/topic,99096.msg685880.html#msg685880

Can be useful in a variety of circumstances, integrating multiple subwoofers is one such case.

[Falconer72]

Helps in phase alignment when making a 3-way active crossover.

[Matt]

The all pass filters I've found all take a focus frequency.  Does that seem expected to you all?

[mattkhan]

You can see a typical biquad APF in https://webaudio.github.io/Audio-EQ-Cookbook/audio-eq-cookbook.html

[Matt]

Yup, and that implementation uses "center frequency" as well.  I coded an all pass a few years ago and left it commented out.  I'll try to bring it back to life.

[carlismysecondname]

I've been wondering where the all-pass filter was in DSP studio... it really should be there.


All-Pass Filters in the Real World
https://www.youtube.com/watch?v=_KAa39OcMoo

Having it can really come in handy.