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Thread: Low Volts From LOC

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    Low Volts From LOC

    Have a brand new Head unit and a brand new PAC LP7-4. Spliced all of the outputs from head unit to the speaker level inputs of the loc, wired all the power and grounds up. Head unit comes on, LOC turns on, go to measure the voltage at the RCA jacks to set the gain and It’s barely making half a volt. PAC’s own manual says to target around 4, my AMP calls for 6. Even with head unit volume all the way maxed and LOC gain maxed out its making 2 volts. Any ideas on why everything is way down on power?

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    Re: Low Volts From LOC

    Quote Originally Posted by DBuckley13 View Post
    Have a brand new Head unit and a brand new PAC LP7-4. Spliced all of the outputs from head unit to the speaker level inputs of the loc, wired all the power and grounds up. Head unit comes on, LOC turns on, go to measure the voltage at the RCA jacks to set the gain and It’s barely making half a volt. PAC’s own manual says to target around 4, my AMP calls for 6. Even with head unit volume all the way maxed and LOC gain maxed out its making 2 volts. Any ideas on why everything is way down on power?
    1/2v peak?
    Or RMS?

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    Wave Shepherd - aka Jazzi Justin Zazzi's Avatar
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    Re: Low Volts From LOC

    Quote Originally Posted by DBuckley13 View Post
    Have a brand new Head unit
    Which one?

    Quote Originally Posted by DBuckley13 View Post
    Spliced all of the outputs from head unit
    Which ones? Speaker level or line level?
    Measure with mics, mark with chalk, cut with torch, grind to fit, sand to finish, paint to match.
    Updated Justin tuning sheet (Justin and Erica tuning companion for SMAART and REW)
    Do it for them.

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    Re: Low Volts From LOC

    Pioneer MVH-S21BT, cheap but effective

    the LOC is installed behind the head unit in the dash. Spliced the wires coming from the harness of the head unit into the loc harness.

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    Wave Shepherd - aka Jazzi Justin Zazzi's Avatar
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    Re: Low Volts From LOC

    Are you playing music or a test tone when making the measurement on the output of the LOC? What volume level on the radio? If you use music the voltage should seem low. If you use a test tone like 60hz then your multimeter will measure it more accurately. Also, what multimeter are you using?
    Measure with mics, mark with chalk, cut with torch, grind to fit, sand to finish, paint to match.
    Updated Justin tuning sheet (Justin and Erica tuning companion for SMAART and REW)
    Do it for them.

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    Re: Low Volts From LOC

    1kHz test tone gives .03vAC but only on the rear L/R channel of LOC, 60Hz test tone gives 1.1vAC again only on rear L/R channels. Have 0 vAC to the Front channels. Checked continuity of splices, all rang out fine. Metered with Fluke 117

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    Wave Shepherd - aka Jazzi Justin Zazzi's Avatar
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    Re: Low Volts From LOC

    Quote Originally Posted by DBuckley13 View Post
    1kHz test tone gives .03vAC but only on the rear L/R channel of LOC, 60Hz test tone gives 1.1vAC again only on rear L/R channels. Have 0 vAC to the Front channels. Checked continuity of splices, all rang out fine. Metered with Fluke 117
    Try measuring voltage before the LOC for the front channels?

    The LOC mentions something about a stereo gain control. Have you tried changing it? That might increase your output.
    Measure with mics, mark with chalk, cut with torch, grind to fit, sand to finish, paint to match.
    Updated Justin tuning sheet (Justin and Erica tuning companion for SMAART and REW)
    Do it for them.

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    Re: Low Volts From LOC

    117 spec sheet says:
    1.0% + 3 (DC, 45 Hz to 500 Hz); 2.0% + 3 (500 Hz to 1 kHz)

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    Team Knuckledragger papacueball's Avatar
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    Re: Low Volts From LOC

    Do you get the same results with all the different sources? Page 9 of the manual says the radio has source level adjustment (SLA). You might check that.

    https://www.pioneer.com.au/wp-conten...ers-Manual.pdf

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    Re: Low Volts From LOC

    According to a quick read the headunit has a pre out so why are you using a line out converter?

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