Thread: These Cables Work. (And why)

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  1. #1 These Cables Work. (And why) 
    Senior Member D Fuller's Avatar
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    There is a lot of confusion about the kind of cable required to get audio into an Epic or Scarlet. Let's clear that up.

    One of the popular choices for XLR-to-Epic/Scarlet TRS inputs are the Hosa XVS102F. It's a 2-foot cable with a female XLR on one end and an angled 1/8" (3.5mm) TRS plug on the other. It works. Feed a balanced mic-level signal into the XLR end and you'll get good audio to your Epic/Scarley out of the TRS end.

    Hosa calls this a "Stereo" cable. For our purposes, it is not. It is a cable that is capable of passing a balanced signal, and is wired to RED's spec. It works on Epic and Scarlet.

    Hosa also makes a mono version of this cable, the Hosa XVM102F. It looks exactly the same, but it will not work. (Note the "M" in the part number. It stands for MONO.)

    Here's why:

    This is a wiring diagram for Hosa's XVM mono cable:



    Pin 2 is wired to both the Tip and the Ring, 1 and 3 are both wired to ground (the Sleeve). This cable is not gonna work on an Epic/Scarlet.



    Now, here's a wiring diagram for Hosa's XVS stereo cable:



    Pins 1, 2 and 3 are are wired straight through to the proper places. This cable will work on an Epic/Scarlet.


    These same principals can be applied to any other manufacturer's cables. They have to pass all three signals to their proper place: 1 to the Sleeve, 2 to the Tip, 3 to the Ring. If they don't, they will not work. Most adapter cables have a wiring diagram on the package, so you can check it out pretty easily.

    I hope this helps.
    David Fuller
    AirStream Pictures
    Auburn & Portland, ME
    www.airstream.pictures
    EPIC-M Dragon #1053
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  2. #2  
    Senior Member Michael Mayda's Avatar
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    Thank you. Great summary, very clear.
    Michael Mayda, Forensic Imaging; Dragon #00942; Epic X #00653; Red MX #1976
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  3. #3  
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    Thanks for the tip.
    You made my life easy.
    Scarlet-X #1103 "O'Hara"
    Red One MX # 10086 "Retro"
    DecoupageFilm.com
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  4. #4  
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    +1 Bringing value to Reduser. Much appreciated.
    Jack Shanahan
    Director of Photography
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  5. #5  
    Moderator Martin Weiss's Avatar
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    This one deserves a sticky. Thank you!
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  6. #6  
    Senior Member Andrew clemson's Avatar
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    Great stuff. Just ordered a bunch on amazon. Theyre about $11 each.
    EPIC-X #7166
    Dubai, United Arab Emirates
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  7. #7  
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    The part I'm confused about is phantom power. Are you getting phantom with that configuration?
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  8. #8  
    Senior Member Stephen Gentle's Avatar
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    Quote Originally Posted by Bob Pierce View Post
    The part I'm confused about is phantom power. Are you getting phantom with that configuration?
    Phantom power isn't currently enabled. If it is eventually, the proper cable would be able to pass it through.

    It may not ever be enabled though, because if you used the wrong type of cable (like the first one) or pulled out the cable while phantom was on, very bad things will happen to either the camera's audio circuitry and/or your mic. Hopefully RED have worked out some kind of protection so it's not a problem.
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  9. #9  
    Senior Member D Fuller's Avatar
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    Quote Originally Posted by Bob Pierce View Post
    The part I'm confused about is phantom power. Are you getting phantom with that configuration?


    No. As Stephen says above, there is no phantom power to get. The release notes for every firmware build so far have said:

    Operational notes specific to Build X vX.X.X:

    Phantom power disabled
    ...
    .
    If I'm not working with an audio recordist with a TC recorder, I run all audio through a Sound Devices Mix Pre-D. It provides phantom power, great preamps, meters, mic-level outs and has a nice, small form factor. I use the Hosa XVS cables to connect the Mix Pre-D to the Epic.
    David Fuller
    AirStream Pictures
    Auburn & Portland, ME
    www.airstream.pictures
    EPIC-M Dragon #1053
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  10. #10  
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    Thanks again David,
    just purchased 2 from amazon.
    Scarlet-X #1103 "O'Hara"
    Red One MX # 10086 "Retro"
    DecoupageFilm.com
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