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    How to use a DMM to set gains?

    ok, i hear a lot about people say they set their gains using a DMM (digital multi meter).

    I myself do not have a DMM and wondering how exactly would i set my gains if I were to get one because i would like to have my gains set correctly. I wouldn't want to harm my irreplaceable IDQ8s and 6s.

    I assume i would have to know how to convert volts into watts? if so, how? *i'm new to electrical terms and formulas*

    thanks in advance for any replies.


    -James







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    Re: How to use a DMM to set gains?

    Best tutorial for this is on jlaudio's website..tells u exactly how to do it..




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    Re: How to use a DMM to set gains?






    anyone around nashville who needs an install done pm me

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    Re: How to use a DMM to set gains?

    i was about to say use the button but the i saw the name "james bang".

    but anyways heres what^^^ was talking about http://mobile.jlaudio.com/support_pages.php?page_id=127




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    Re: How to use a DMM to set gains?

    Read the stickies, n00b......




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    Re: How to use a DMM to set gains?

    ok, i jsut gone through the tutorial on the JL site, and the only part that throws me off is the voltage chart for their amps. since i dont' use 'their' amps, how would i know what voltage to look for.

    and yes i've searched, then i got burnt out reading the many pages. what I mainly need to know is what voltage i need to get certain watts. yeah i'm a noob in this area. electrical terms > me.

    i just found this site for it: http://www.sengpielaudio.com/calculator-ohm.htm

    would this work? can i use their calculator and input my desired watts and ohms of my speaker and get the voltage i need?




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    Re: How to use a DMM to set gains?

    lol i've always wanted to set gains correctly but i get stumped with the terms too



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    Re: How to use a DMM to set gains?

    Take an hour to familiarize yourself with the terms then set your gain and it's no sweat, it' s not that hard at all, just the calculations :P




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    Re: How to use a DMM to set gains?

    Quote Originally Posted by James Bang View Post
    ok, i jsut gone through the tutorial on the JL site, and the only part that throws me off is the voltage chart for their amps. since i dont' use 'their' amps, how would i know what voltage to look for.

    and yes i've searched, then i got burnt out reading the many pages. what I mainly need to know is what voltage i need to get certain watts. yeah i'm a noob in this area. electrical terms > me.

    i just found this site for it: http://www.sengpielaudio.com/calculator-ohm.htm

    would this work? can i use their calculator and input my desired watts and ohms of my speaker and get the voltage i need?


    Try this voltage calculator, its far simpler-

    http://www.caraudio911.com/tutorials...et/voltage.htm




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    Re: How to use a DMM to set gains?

    Quote Originally Posted by Rich B View Post
    Try this voltage calculator, its far simpler-

    http://www.caraudio911.com/tutorials...et/voltage.htm
    sweet. i believe i'm set now..

    time to go out and buy a DMM.




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    Re: How to use a DMM to set gains?

    if your deck is clipping or your amp is clipping, setting to whatever V you need can still ruin your sub/s

    thats why i bought this

    http://www.amazon.com/Oscilloscope-V...343779-7693625



    Alpine 9887, Cadence TXA-1502, Oz ME 180CS, Cadence TXA-1000d, 12" RE SE sealed, Second Skin Damp Pro

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    Re: How to use a DMM to set gains?

    Quote Originally Posted by James Bang View Post
    ok, i jsut gone through the tutorial on the JL site, and the only part that throws me off is the voltage chart for their amps. since i dont' use 'their' amps, how would i know what voltage to look for.

    and yes i've searched, then i got burnt out reading the many pages. what I mainly need to know is what voltage i need to get certain watts. yeah i'm a noob in this area. electrical terms > me.

    i just found this site for it: http://www.sengpielaudio.com/calculator-ohm.htm

    would this work? can i use their calculator and input my desired watts and ohms of my speaker and get the voltage i need?
    It's easy.

    Sq root of Watts X ohms = the voltage

    Say your speaker load is 4ohms and you want to set your amp to feed them 100 watts

    100 X 4 = 400 then the sq root of 400 = 20

    20 volts is what you are loking to set that channel to using a 0db reference test tone. or -3db test tone to some peoples logic that music will never be at a 0db referencve point. Aslo if you are using a high end HU, more than likely you should be safe setting the gains with the HU at full volume.




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    Re: How to use a DMM to set gains?

    Quote Originally Posted by nauc View Post
    if your deck is clipping or your amp is clipping, setting to whatever V you need can still ruin your sub/s

    thats why i bought this

    http://www.amazon.com/Oscilloscope-V...343779-7693625
    Interesting. By far using a O=scope is the best, but you can still get reasonbly good results with a DMM as opposed to ear tuning. Thanks for that link though. At that price using it is tempting.




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    Re: How to use a DMM to set gains?

    i freakin love it, push one button to turn it on, then another to do its thing and thats it

    if it ever stops workin, im buyin another one



    Alpine 9887, Cadence TXA-1502, Oz ME 180CS, Cadence TXA-1000d, 12" RE SE sealed, Second Skin Damp Pro

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    Re: How to use a DMM to set gains?

    is ever bad that setting the gains correctly for me is too much and i set the gains lower then when they are correctly set?



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