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    Icon33 Subs Not Moving in Sync with One Another

    I was just wondering that if subs weren't moving in sync with one another would it be harmful? Would it affect SPL in anyway?



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    Affect SPL: YES. Becuz you aren't pushing all the air it can at the same time.

    Possible Causes:
    -polarity of one sub is reversed
    -you are using 2 (or more) subs in a box which is one big enclosure (nono on sealed).
    With them using the same air space, they compete for the same air. It's called "push pull effect"..



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    I've also seen leaky boxes, faulty RCA's and bad amps cause this....



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    What about a common chamber ported enclosure? Should the subs still move in sync with one another?



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    sounds like their out of phase, try changing the polarity or even the angle of the box.




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    my guess is it isn't a phase problem or polarity by reading your discription of your audio setup my guess is it's b/c your using 2 amps 1 per sub. unless you have the amp strapping circuit they talk about my guess is that's your problem. one of the amps might be slighty off of when you tuned the amps together in the first place. now if they are strapped together then i'm wrong and it is something else.

    adam



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    wow....
    for once adam and i are on the same page



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    Originally posted by more_spl


    With them using the same air space, they compete for the same air. It's called "push pull effect"..
    This effect does not exist. 2 subs in 2 cubes of air will behave exactly the same as 2 subs each with 1 cube of air (sealed enclosures). They do not "compete" with each other for airspace.

    "push-pull" is generally a term for isobaric loaded boxes, where the subs are wired out of phase on purpose - one sub pulls , while the other pushes.

    In a sealed enclosure with both subs wired the same, they act together. There is no need to have subs in separate airspace except to protect the other if one blows. Sharing airspace has zero effect on SPL, x-max, or any other factor of how the woofers perform. It's basic physics.

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    check that you + and - cables are both right.




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    Originally posted by hihoslva
    This effect does not exist. 2 subs in 2 cubes of air will behave exactly the same as 2 subs each with 1 cube of air (sealed enclosures). They do not "compete" with each other for airspace.

    "push-pull" is generally a term for isobaric loaded boxes, where the subs are wired out of phase on purpose - one sub pulls , while the other pushes.

    In a sealed enclosure with both subs wired the same, they act together. There is no need to have subs in separate airspace except to protect the other if one blows. Sharing airspace has zero effect on SPL, x-max, or any other factor of how the woofers perform. It's basic physics.

    ~HH
    ok. i'm not doubting you. I would like someone to explain. The air is all shared, so how can it be 100% equal between the 2? Split 50-50. It sounds impossible.



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    Originally posted by LoneRanger
    wow....
    for once adam and i are on the same page
    that's b/c i'm learning my good man. my biggest guess is that though don't you think??

    adam



    2006 Bright Island Blue 6s: stock 6 disc in dash, Hertz Hi-Energy 6.5" comps, MB Quart Ref 12", eclipse 5-channel sub amp.

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    Steve a.k.a. ss3079: So this one lady goes, "These ignorant people who drive around blasting there music, they cant hear emergency vehicles"
    So that set me off, and I said "Well then why do they let deaf people drive?"

    AOL: JmKeenen

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    Re: Subs Not Moving in Sync with One Another

    Originally posted by james33440
    I was just wondering that if subs weren't moving in sync with one another would it be harmful? Would it affect SPL in anyway?
    maybe im missing somthing but if your subs are wired in stereo and not in mono they will not move in sync with each other bc there will be bass in the left channel and not in the righ tat times...



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    Re: Re: Subs Not Moving in Sync with One Another

    Originally posted by EPanther99
    maybe im missing somthing but if your subs are wired in stereo and not in mono they will not move in sync with each other bc there will be bass in the left channel and not in the righ tat times...
    bass is (or at least SHOULD BE) recorded mono. It will play the same way w/ multiple subs in stereo config. My subs are corrently wired stereo (becuz of my amp) but they still move in sync w/ each other. It's like this cuz bass is omnidirectional



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    Re: Re: Re: Subs Not Moving in Sync with One Another

    Originally posted by more_spl
    bass is (or at least SHOULD BE) recorded mono. It will play the same way w/ multiple subs in stereo config. My subs are corrently wired stereo (becuz of my amp) but they still move in sync w/ each other. It's like this cuz bass is omnidirectional
    i have many bass cds where the bass is recorded in stereo....it kind of gives a waving effect to the music, and when it plays one speaker will be moving a lot and the other will stay still bc everything is recorded in the left or right channel at that time, although i have almost always had my subs wired in mono the bass is louder....



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    If you run subs in stereo, they should be separated. The subs moving independently is not a good thing when they share airspace - and yes, plenty of the frequencies played through subwoofers IS recorded in stereo. There's no reason bass *should* be recorded mono, and often it is not.

    The human ear cannot determine what direction bass comes from, but this varies with frequency. While you might not be able to locate the sub playing 40 or 50 hz, you can definitely hear where 80 or 100 hz is coming from, and that is still sub-bass in a lot of music and in many people's setups.

    For stereo subs, separate them if at all possible. But since 99% of us (probably) run subs mono, shared airspace is a-ok.


    ~HH



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