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    PESteele's Avatar
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    Knocking sound from sub at high volumes

    i got everything all sealed up now and it sounds great and gets loud but when i turn it up real loud on songs like late night tip or bass i love you theres a really distinct and loud knocking noise. Anyone know what this might be. The box is completely sealed. I think it may be bottoming out cause the x-max gets to way more than 27mm. How can i stop this. Any help would be appreciated



    99 jeep cherokee on 32, Jvc kd-avx1, Elevation audio concert series speakers, kicker zx250.2, 2 Massive audio cw 12's, directed 1500d

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    Re: Knocking sound from sub at high volumes

    Sounds like over excursion. Possibilities are too much power, too large of a box, or tuning issues.




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    Re: Knocking sound from sub at high volumes

    its in 6 cf sealed. But thats what recommended for it. Its an 18



    99 jeep cherokee on 32, Jvc kd-avx1, Elevation audio concert series speakers, kicker zx250.2, 2 Massive audio cw 12's, directed 1500d

    Refs- Twoohfour, SAG3, fo0manchu, guy022077, chris96camaro, frangka2, marcusb419er, XaznKewLguyX, Dj-torn, Milenko515, 6spdcoupe, foreman, tommelton(bimmerforums), burnzie2413, saywhat, Untouchable11, iceteebone, HarleyF150, Fi Car Audio, loud-n-low, dvrmstrng, Deucelee, MJ-tC, coachtjm, 80INCHES, jeepintn, sxkicker89, BiZkiT8u

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    PESteele's Avatar
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    Re: Knocking sound from sub at high volumes

    also i havnt set the gains properly yet so it might be getting a clipped signal or something like that



    99 jeep cherokee on 32, Jvc kd-avx1, Elevation audio concert series speakers, kicker zx250.2, 2 Massive audio cw 12's, directed 1500d

    Refs- Twoohfour, SAG3, fo0manchu, guy022077, chris96camaro, frangka2, marcusb419er, XaznKewLguyX, Dj-torn, Milenko515, 6spdcoupe, foreman, tommelton(bimmerforums), burnzie2413, saywhat, Untouchable11, iceteebone, HarleyF150, Fi Car Audio, loud-n-low, dvrmstrng, Deucelee, MJ-tC, coachtjm, 80INCHES, jeepintn, sxkicker89, BiZkiT8u

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    Re: Knocking sound from sub at high volumes

    Have you talked to scott from Fi?? Either on the phone or at SS.com



    Ref: Zeuslicious -



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    Re: Knocking sound from sub at high volumes

    Quote Originally Posted by PESteele View Post
    also i havnt set the gains properly yet so it might be getting a clipped signal or something like that

    Well that could be a reason if your gains have been set to high!!

    Tinsel slap,Over excursion (bottoming out).....bad things man.


    *SIGH*.....I'm not writing it again so here is a link.......Amp setting tutorial

    Read the first four posts in that thread.....http://www.caraudio.com/forum/showthread.php?t=164826



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    Re: Knocking sound from sub at high volumes

    Quote Originally Posted by Phreaker View Post
    Well that could be a reason if your gains have been set to high!!

    Tinsel slap,Over excursion (bottoming out).....bad things man.


    *SIGH*.....I'm not writing it again so here is a link.......Amp setting tutorial

    Read the first four posts in that thread.....http://www.caraudio.com/forum/showthread.php?t=164826
    I'm assuming this guy knows more than the basics and how to work a DMM, Sounds like something more mechanical than a tutorial



    Ref: Zeuslicious -



    2 DC lvl3 12's
    Memphis Mc-1000d
    46 hz 146.8 new TL

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    Re: Knocking sound from sub at high volumes

    setting my gains seemed to stop it for now but well see. I set it to 1000 and i could barley hear it with everything flat. So i put loudness to medium and it sounds great and excursion seems a little more in control



    99 jeep cherokee on 32, Jvc kd-avx1, Elevation audio concert series speakers, kicker zx250.2, 2 Massive audio cw 12's, directed 1500d

    Refs- Twoohfour, SAG3, fo0manchu, guy022077, chris96camaro, frangka2, marcusb419er, XaznKewLguyX, Dj-torn, Milenko515, 6spdcoupe, foreman, tommelton(bimmerforums), burnzie2413, saywhat, Untouchable11, iceteebone, HarleyF150, Fi Car Audio, loud-n-low, dvrmstrng, Deucelee, MJ-tC, coachtjm, 80INCHES, jeepintn, sxkicker89, BiZkiT8u

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    Re: Knocking sound from sub at high volumes

    Properly set input sensitivity adjustments are your friend



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    Re: Knocking sound from sub at high volumes

    Quote Originally Posted by Prowler573 View Post
    Properly set input sensitivity adjustments are your friend
    x2... What wur your gains set at?? No matter what i set my gains at, on any system ive ever had, ive never bottomed out or slapped the leads .. And for the most part ive put at least 25% more than RMS to them..



    Ref: Zeuslicious -



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    Re: Knocking sound from sub at high volumes

    Could be your ears distorting.




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    Re: Knocking sound from sub at high volumes

    Quote Originally Posted by CBFryman2 View Post
    Could be your ears distorting.
    Not with 1 18... Maybe a sayar setup



    Ref: Zeuslicious -



    2 DC lvl3 12's
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    46 hz 146.8 new TL

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    Re: Knocking sound from sub at high volumes

    Quote Originally Posted by hzsogood View Post
    Not with 1 18... Maybe a sayar setup
    1 Mag 15 and my ears distort before the mag reaches its mechanical limits or my samp gets anywhere near clipping.

    Sounds a lot like bottoming out only not.




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    Re: Knocking sound from sub at high volumes

    Quote Originally Posted by CBFryman2 View Post
    1 Mag 15 and my ears distort before the mag reaches its mechanical limits or my samp gets anywhere near clipping.

    Sounds a lot like bottoming out only not.
    Does sound a lil weird



    Ref: Zeuslicious -



    2 DC lvl3 12's
    Memphis Mc-1000d
    46 hz 146.8 new TL

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