I have recorded bass d.i and turned low pass on 300hz. Then i duplicated this track and then turned high pass on 300hz . Can duplicated track cause phase issue ? When i listen to duplicated track it drops in volume and when i change phase its louder

  • analog filters change phase

    ? What do you mean

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  • Yes. EQs can cause phase issues.

    But why were you doing this in the first place?

    For getting controlled low end with first track and second i have distortion on

    There won’t be phase issues if there are no overlapping frequencies. Plus, you can make your low end mono.

    There won’t be phase issues if there are no overlapping frequencies

    Sure, but filters are not infinitely steep, so there's always some overlap.

    And, the steeper you move them toward brickwall, the more that causes other issues.

    And, phase matters for summing two sources regardless of whether it's in mono or not.

  • Yes, it may cause phase problems.

    And yes, if summing causes a drop in volume, things are out of phase.

    You can rig up a Linkwitz-Riley crossover (look it up) to avoid phase problems, or you can use linear phase crossovers, or you can find some in-between setting where the phase shift is cool, or you can solve your bass sound some other way besides splitting it like this.

  • Yes by doing what you are doing it is causing “phase issues”. You can flip polarity and/or nudge one track forward or backward by ear until it sounds full again. Or what I do is throw Melda Mautoalign on both tracks that are duplicated, as the last plugin on each and run that. Does all that in seconds.

  • You shouldn't be having phase issues with the same track duplicated. It may be slightly off. Check the alignment. Low pass on one and high pass on the other at the same frequency wouldn't drastically affect the phase except in the crossover area.

  • Since you're filtering it in a way that is mitigating the amount of overlap in frequency, it is less likely to cause issues with phase.

  • Zoom all the way in on the 2 tracks & compare the waveforms. The up & down peaks & valleys should align. If they dont, you’re out of phase.

    (You can even click & drag on one of them to bring it into phase)

  • It's worth checking if your plug-ins are causing some differing latency that's pushing the two tracks out of phase with each other