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Thread: M1a jack wiring

  1. #1
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    M1a jack wiring

    I'm augmenting my M1a installation with another transducer and notice that the output jack wiring for the M1 is TRS. I'm going to split the output into a stereo Y cable to keep the pickups separate. I see the red lead from the M1 goes to the tip and the white to the ring. Do I move the existing white lead to ground when I add the output lead from my other pickup?

  2. #2
    Administrator Caleb_Elling's Avatar
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    Hey MisterH,
    Since the M1A is actually Active, it does need all three wires in order to work correctly. The red is the signal, and the white wire is the switch that turns the pickup on and off when a guitar cable is connected or disconnected. Removing the white wire will leave the M1A turned off at all times.

    If you wanted to run the M1A with an additional pickup, you would need a TRSS jack, with 4-seperate contacts.

    The M1 Passive can be used with or without the switch contact.

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    Quote Originally Posted by Caleb_Elling View Post
    Hey MisterH,
    Since the M1A is actually Active, it does need all three wires in order to work correctly. The red is the signal, and the white wire is the switch that turns the pickup on and off when a guitar cable is connected or disconnected. Removing the white wire will leave the M1A turned off at all times.

    If you wanted to run the M1A with an additional pickup, you would need a TRSS jack, with 4-seperate contacts.

    The M1 Passive can be used with or without the switch contact.
    Thanks for your reply. So if I move the white lead to the tip then the pickup will be on all the time, yes?

  4. #4
    Administrator Caleb_Elling's Avatar
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    Moving the switch wire to the tip wouldn't do anything, actually.

    The switch needs to be connected to ground in order for the pickup to turn on. When you use a mono cable into the M1A jack, the ring gets shorted out to ground, turning the pickup on. If you used a stereo cable, all three contacts remain separate, keeping the pickup off.

    That's why a TRSS would be necessary. A TRSS has a Tip, Ring, (dedicated) Switch, and Sleeve.

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    Quote Originally Posted by Caleb_Elling View Post
    Moving the switch wire to the tip wouldn't do anything, actually.

    The switch needs to be connected to ground in order for the pickup to turn on. When you use a mono cable into the M1A jack, the ring gets shorted out to ground, turning the pickup on. If you used a stereo cable, all three contacts remain separate, keeping the pickup off.

    That's why a TRSS would be necessary. A TRSS has a Tip, Ring, (dedicated) Switch, and Sleeve.
    Forgive me if I sound confused, so if the white lead gets moved over to the ground side of the jack then the pickup would be active all the time?
    Last edited by MisterH; 10-19-2015 at 01:31 PM.

  6. #6
    Administrator Caleb_Elling's Avatar
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    Quote Originally Posted by MisterH View Post
    Forgive me if I sound confused, so if the white lead gets moved over to the ground side of the jack then the pickup would be active all the time?
    That's exactly right.

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    Are you referring to a 1/4" TRSS? Could you point us to one somewhere? I see 1/8" a lot but not 1/4". This has been a discussion on some other forums. a 1/4" format would solve a lot of problems.

  8. #8
    Administrator Caleb_Elling's Avatar
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    Here's one on Allparts: https://www.allparts.com/EP-4163-001...ck_p_1381.html

    I had to search for 4-conductor jack to find this one. "TRSS" didn't show many results.

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