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Aux feed subs?
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<blockquote data-quote="Silas Pradetto" data-source="post: 90168" data-attributes="member: 34"><p>Re: Aux feed subs?</p><p></p><p></p><p></p><p>A good example of how an allpass filter helped me out recently:</p><p></p><p>I use RCF and JBL active subwoofers, and they both unfortunately use high-order lowpass filters. I also use Fulcrum Acoustic boxes, which have a 24dB/octave highpass integrated in their greybox processing. When you try to align a box with a 24dB highpass and a box with a 48dB lowpass, it is just not going to happen nicely. Fortunately, the processing the Fulcrum boxes use has allpass filters, and I was able to double-stack second-order allpass filters at the same frequency as the highpass, effectively giving me the phase shift of a 48dB/octave highpass with the rolloff of a 24dB/octave highpass. Things aligned easily after that.</p><p></p><p>A very simple example, but I hope it helps.</p></blockquote><p></p>
[QUOTE="Silas Pradetto, post: 90168, member: 34"] Re: Aux feed subs? A good example of how an allpass filter helped me out recently: I use RCF and JBL active subwoofers, and they both unfortunately use high-order lowpass filters. I also use Fulcrum Acoustic boxes, which have a 24dB/octave highpass integrated in their greybox processing. When you try to align a box with a 24dB highpass and a box with a 48dB lowpass, it is just not going to happen nicely. Fortunately, the processing the Fulcrum boxes use has allpass filters, and I was able to double-stack second-order allpass filters at the same frequency as the highpass, effectively giving me the phase shift of a 48dB/octave highpass with the rolloff of a 24dB/octave highpass. Things aligned easily after that. A very simple example, but I hope it helps. [/QUOTE]
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