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    Slaugh's Avatar
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    Icon11 how do i measure preout voltages?

    hi i have an alpine cda-9815 and im suspicing its preouts are too weak because i have to set gains too high...

    how do i measure the voltage?







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    Re: how do i measure preout voltages?

    No one else seems to be responding, so I'll jump in and keep you company.
    As for helping you out, I dont what the procedure is for that, Have you checked Google? Actually I'll go have a look and see if I can find a link.

    Nope cant find it, but I did find a **** good FAQ-
    http://www.faqs.org/faqs/car-audio/part1/
    Why use your brain to help people when you can cut and paste?.

    Oh, there seems to be a problem with a bunch of the New Alpine head units these days including eject mechanisms and weak preouts.




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    Re: how do i measure preout voltages?

    Alpine is notorious for having weak preouts, deal with it...




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    Re: how do i measure preout voltages?

    There was a thread on icix where people were measuring the preout voltage to see how accurate the ratings were.




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    Re: how do i measure preout voltages?

    Quote Originally Posted by zachzchw
    There was a thread on icix where people were measuring the preout voltage to see how accurate the ratings were.
    Link *****!




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    Re: how do i measure preout voltages?

    Quote Originally Posted by cjjackson85
    Link *****!

    Whats that say? "Link, massa"? Alright, since youve asked so nicely.....

    http://www.icixsound.com/vb/showthre...preout+voltage




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    Re: how do i measure preout voltages?

    Yeah, that year Alpine was pretty famous for weak outputs; atleast on the subwoofer output. Also realize that, on that Alpine, the sub level has to be set to +15 for full output.

    Anyways; you'd grab a DMM and set it to volts AC, stick the DMM's red lead on the inside of the RCA preout, the black lead on the outter shield of the RCA preout, play a 0db sine wave and read what the display tells ya. Also keep in mind that, with only a DMM, you won't be able to monitor the point of clipping. I'm not sure if the Alpine's clip and at what volume they do (if they do).




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    Re: how do i measure preout voltages?

    Quote Originally Posted by squeak9798
    Yeah, that year Alpine was pretty famous for weak outputs; atleast on the subwoofer output. Also realize that, on that Alpine, the sub level has to be set to +15 for full output.

    Anyways; you'd grab a DMM and set it to volts AC, stick the DMM's red lead on the inside of the RCA preout, the black lead on the outter shield of the RCA preout, play a 0db sine wave and read what the display tells ya. Also keep in mind that, with only a DMM, you won't be able to monitor the point of clipping. I'm not sure if the Alpine's clip and at what volume they do (if they do).

    People were complaining about the weak pre outs for atleast 2 model years.



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    Re: how do i measure preout voltages?

    I've always figured that a HU's power output increases exponentially. That's just given. I have also measured mine but with a -12db sine wave. Didn't get much output. =\ That's given, too.




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    Re: how do i measure preout voltages?

    Im really upset i got the CDA9855 instead of following my gut to stick with eclipse HU'ss :/ Looks like after only a month ill take a $100+ loss on my Alpine + Sisirus tuner to grab the eclipse .



    -------------------------------
    ECLIPSE CD8445 w/ SIR-ECL1
    DLS Iridium 6.2 comps. powerd by Zapco C2K 3.0
    Image Dynamics IDQ12 by Zapco Ref. 350
    Dynamated Drivers and Passengers Door fully
    Streetwires for all wiring. 4ga > 8ga power, 14ga speaker.
    Zapco Symbilink Fully Balanced System

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