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Non-Minimum Phase IRs

Discussion in 'Axe-Fx III Discussion' started by FractalAudio, Jan 3, 2019.

  1. yek

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    Mic Distance in the Cab block doesn't control the mic that was used to capture the IR. It can't be used to solve phase issues.

    Smoothing = De-phase.
     
  2. Tremonti

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    These are great. They have taken over all my cab sounds. Thanks!
     
  3. Casper

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    How can I readily tell if an IR is MPT or not? Is it flagged in the name?
     
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  4. #44 brianv4, Jan 5, 2019
    Last edited: Jan 5, 2019
    brianv4

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    would be nice if there were a way to tell by reading the name, I B U

    EDIT: referring to user cab banks
     
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  5. Brian Angiel

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    I think the stock cabs are all MPT'd by default for the purposes of mixing within the box.
     
  6. yek

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    Yes, all stock cabs are MinPhase.
     
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  7. Perdikament

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    Off the top of your head, does this also hold true for most Cab Packs in the Fractal Store?
    I’m wondering if there was a certain criteria or standard that they all met prior to publishing?
     
  8. zenaxe

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    Speaking of conversion, etc: If I drop a wav on the AE cab manage tool to load it, is it MPT or raw?
     
  9. h.c.e.

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    By default, if you never changed the settings, MPT.

    In AE-III go to: Settings -> Preferences... -> Cabinet Import -> IR Processing and set it to "None" if you want Raw syx conversion (there's also an option in Axe-Manage Cabs tool under the browse menu toward the bottom somewhere (not in front of axe, can't remember exact menu option for certain), but the Settings -> Preferences is the master control for that option as well.)

    In Cab-Lab 3: Settings -> Default Processing Mode -> None
     
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  10. DLC86

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    In some circumstances it could be better to select auto-trim, I've noticed some IR producers leave quite a bit of silence at the beginning of the files, this would introduce a tiny bit of latency and the resolution of the IR would be lower cuz it will be cut (windowed) earlier.
     
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  11. Brian Angiel

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    Conversely, some IR creators specifically suggest against using auto-trim, such as OwnHammer. I'd imagine it's pretty case-by-case depending on the producer.
     
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  12. DLC86

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    Definitely. Using auto trim doesn't guarantee that IRs will be aligned when mixed, while without processing they usually are if they come from the same producer.
     
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  13. King’s X - Jason

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    ^^^^ I think this is an excellent idea. +1
     
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  14. Matt Minaj

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    I totally agree with this one.
     
  15. bdrepko

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    Interesting. I was checking out some of my Ownhammer IRs when I read the readme file in the Fractal folder. It stated the following

    The following folders contain .wav files perfectly prepared for
    conversion to the Fractal Audio Systems derivative format types.

    These .wav files are 200 ms in length and NOT minimum phase transformed
    so as to avoid cascading processing by FAS conversion software.

    Conversion to Fractal Audio Systems formats requires Fractal Audio System's
    conversion utility. For more information on loading or converting files, please
    see the Fractal Audio Systems website and documentation.
     
  16. shatteredsquare

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    Then why does ~140 millimetres always give a sweet spot when using even a single IR? It's super subtle, almost imperceptible, but spending 20 minutes scrolling from 0 to 340, 140mm going back to 0 takes the magic away, it's hard to really even hear it do anything different, maybe it's just notching my favorite 500hz mid band. I guess it's got a fixed mix ratio with the dry signal maybe cause I can definitely tell a difference when using a single IR, it's subtle but I guess fractions of a millimetre would be...
     
  17. 200man

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    Why were all the IRs transformed from raw IR responses to MPT types originally?
    Was this soley for the purpose of making it easier to mix multiple IRs?
     
  18. shatteredsquare

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    so you don't have to mess with mic distance, just add some together and they are already more or less lined up right
     
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  19. iaresee

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    Yes.
     
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  20. Perdikament

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    Okay now for the next big debate, what’s everyone’s feelings on which wav file resolution to pick when converting; 96/24/500 or just start right off with 48/24/200?
     

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