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  1. #1
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    useful little tool for setting gains...

    get a pair of headphones, and then goto radioshack and buy an adapter to convert the 1/8 plug on the end of them to stereo rca connectors. either that, or hack the end off of the phones and solder rcas onto the cable.

    your done.

    plug these into your hu's outputs, and find out the exact spot where your hu starts clipping. youll know youre there when it starts distorting.

    you can use these the same way with any preamp-level processor.

    this will allow you to get the maximum amount of CLEAN voltage to drive your amps input stages!

    have fun, start soldering!



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    Re: useful little tool for setting gains...

    thanks for the post man!




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    Re: useful little tool for setting gains...

    Won't that garantee bleeding from the ears and deafness? I'm confused...is it because pramp output isn't high enough voltage to generate any volume to hurt?



    Shop smart...Shop S-Mart... YOU GOT THAT!!!!!!!!

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    Current Setup:
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    Re: useful little tool for setting gains...

    preamp voltage = 0.01-7 volts... amplifier output voltage = 35-100+volts



    -

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    Re: useful little tool for setting gains...

    no, it prob wont get loud AT ALL, just loud enough to know when youre clipping.



    AIM: rustyself
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    Re: useful little tool for setting gains...

    cool, good idea.



    Shop smart...Shop S-Mart... YOU GOT THAT!!!!!!!!

    salsa shark....

    Current Setup:
    Vehicle: 2004 Honda Civic Si
    Head: DEH 860MP
    Mid/High: Dls UP-6
    Subs: Dls Iridium 10
    Amp: Xtant 403a
    Other:Valentine 1 radar detector with remote display, Pioneer ipod controller, XM sat radio, Rear fill was determined to be a part of a communist plot to destroy our way of life and was henceforth banished from my car

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    Re: useful little tool for setting gains...

    What is the typical impedance of most generic headphones?




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    Re: useful little tool for setting gains...

    Quote Originally Posted by squeak9798
    What is the typical impedance of most generic headphones?
    mine are 16ohms.




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    Re: useful little tool for setting gains...

    it varies. the one i have here just checked 37 ohms. its really not that important when doing this sort of thing, though, because most amps, as you already know, present several thousand ohms @ the input stage.



    AIM: rustyself
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    Re: useful little tool for setting gains...

    Quote Originally Posted by toaster
    because most amps, as you already know, present several thousand ohms @ the input stage.
    Exactly The output impedance of the source is much much lower than the input impedance of the receiving component. Same thing with the output of amplifiers....very minimal output impedance vs. the (relatively) higher input impedance of the speaker (hence, damping factor)

    Whereas most output impedances will be >100ohm for the source unit's preamp outputs, trying to drive a very low (relatively) input impedance of the headphones.


    I'd prefer Dave Navone's method of a small powered speaker that can also typically be picked up at Radio Shack or the like for little $$.
    Last edited by squeak9798; 11-27-2005 at 09:35 PM.




  11. #11
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    Re: useful little tool for setting gains...

    Setting the gains this way protects the subs right?

    But does this method protect the subs too. What I am saying is that I have an amp that is going to power four eights at 1 ohm. However if I give the full potential (1200 watts total) of the amp towards the these 4 eights (only want 200watts each=800 total), it would likely be harmful to them.

    What would be the best method of setting the gains in this setup.




  12. #12
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    Re: useful little tool for setting gains...

    i use a test light. .........




  13. #13
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    Re: useful little tool for setting gains...

    oooya squeak, forgot about the small speaker, it works well, also. either or is fine.



    AIM: rustyself
    mecp certified first class installer
    former usac director
    some SX pron for ya of my ride:
    http://realmofexcursion.com/videos/REAudio/sx15.24.wmv
    Team Gates Memberhttp://img53.imageshack.us/my.php?im...matruck6ib.jpg
    just a lil history lesson about the evolution of modern spl vehicles:
    http://audioforum.termpro.com/cgi-bi.../t/006331.html
    old school. word.

  14. #14
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    Re: useful little tool for setting gains...

    This is majorly interesting, never though about doing that....hmmm experiments!



    Shop smart...Shop S-Mart... YOU GOT THAT!!!!!!!!

    salsa shark....

    Current Setup:
    Vehicle: 2004 Honda Civic Si
    Head: DEH 860MP
    Mid/High: Dls UP-6
    Subs: Dls Iridium 10
    Amp: Xtant 403a
    Other:Valentine 1 radar detector with remote display, Pioneer ipod controller, XM sat radio, Rear fill was determined to be a part of a communist plot to destroy our way of life and was henceforth banished from my car

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