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    active vs passive

    WHat is the difference in active and pasive crossovers? I did a serch but did not come up with much.







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    j3bus2k3's Avatar
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    Re: active vs passive

    Then you didnt search good enough...

    http://www.caraudio.com/forum/showth...passive+active



    AIM: SPL Performance1
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    Re: active vs passive

    Quote Originally Posted by KRD View Post
    WHat is the difference in active and pasive crossovers? I did a serch but did not come up with much.




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    Re: active vs passive

    once you go active you dont go back.




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    Re: active vs passive

    WorldDre and AzBass are active 4 lyfe



    Comming Spring 2009


    I make rear-loaded, double crabshell, isobaric enclosures.

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    Re: active vs passive

    Sorry about the seach thing. It has been a long day. Now that I know the difference of them, lets say my comp comes with passive. Where is a good place to get some active? What is a good company?




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    Re: active vs passive

    I run Dayton junk active currently. I'm very happy with it, except for how large the tweeters are.





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    Re: active vs passive

    Quote Originally Posted by KRD View Post
    Sorry about the seach thing. It has been a long day. Now that I know the difference of them, lets say my comp comes with passive. Where is a good place to get some active? What is a good company?
    meet up with me sence you are in my area. im running dynaudio speakers active. right now. i can show you whats up.




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    j3bus2k3's Avatar
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    Re: active vs passive

    Your comps did come with a passive crossover. You can buy an active crossover from ebay or in the classifieds; from companies like audio control or Coustic.



    AIM: SPL Performance1
    /////Alpine 9835
    Active Processing via Coustic XM7
    Dayton 7" Mid-woofer with Seas Neo Tweet
    JBL/Crown 1100 & Power 300.4
    12" TC3000 Based Custom in 2.25ft^3 at 32hz

    Wallet say But I say


    References:Moe Lester, PV Audio, sss18734, DJ-Torn, dleccord, jiggy2dmax, Negativezeroz, Bama350z, TeamPSI, dB Dom, Kenny Pollock, Flossinon24s, Patfitz9 (x2), AppleBonker, BassAddictJ, the727kid, skadude016, CaliKid, Thumper88, Djman37, TeamQuakeCelica, Cerob, Pimpedout97x, Troy_Audi0, got_focus?, Karleon, Jamaica2G, rtillare, dumple, JohnnyBusa, mattmcss, whitem1ke88, nineball

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    Re: active vs passive

    azbass, I may be able to come earlier before school starts. It starts at 7:40 pm. I would like to check those out. I will check back after I get off work.




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    Re: active vs passive

    thats early. i wake up at 8 to go to work.




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    Re: active vs passive

    I wish I could wake up at 8. I get up at 5 am, work to about 2ish, then to go school from 7:40 to 10 at night, then do it all over agian.




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    Re: active vs passive

    "This is important becuase EVERYONE asks if you can combine filters. YES you can. BUT not with the intended results. The final filter will be the product of all the filters. thus if filter A is -10dB at 80hz, and filter B is -0.1dB at 80hz, the final result will be -10.1dB @ 80hz. if both filters A and B are -3dB at 80hz, the result will be -6dB @ 80hz. if you were defining a cutoff at -3dB, then the resulting filter's cutoff is not 80hz." written by thch

    Can some one explain this alittle more? I have a Coustic XM6 and was woundering how crossover slopes put together would work. Is it a good thing or not? Is he saying that if you put a -24db/oct slope @ 80hz with a second
    -24db/oct slope @80 hz that you have -48db/oct slope but not @ 80hz?




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    Re: active vs passive

    Quote Originally Posted by Lonewolf32 View Post
    Can some one explain this alittle more?
    That's explained about as well as it can be.

    I have a Coustic XM6 and was woundering how crossover slopes put together would work. Is it a good thing or not?
    Both.

    Audio Rule #1; Nothing is "wrong" if the end result sounds better.

    If it sounds better to combine two crossovers to achieve the desired results, then you did it right since it works for you. If it sounds worse, then it's wrong for your particular situation.

    Is he saying that if you put a -24db/oct slope @ 80hz with a second
    -24db/oct slope @80 hz that you have -48db/oct slope but not @ 80hz?
    Correct. The crossover point is technically the point at which the signal is attenuated by -3db. And since you would have two filters, each attenuating the signal by -3db, the result would be an attenuation of -6db at 80hz.....hence, it's no longer the effective crossover point.

    Combining filters isn't an easy subject. It gets more complicated if you start combining different filters, with different crossover frequencies and different slopes.

    But, always revert back to rule #1. Just because you don't understand the mathmatics, doesn't mean your ears won't be able to tell you whether it was a "good" thing or a "bad" thing. If you have the necessary equipment...try it out, see how the sound differs.

    BTW; thch knows his stuff. When you run across one of his posts, read them.




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    Re: active vs passive

    Correct. The crossover point is technically the point at which the signal is attenuated by -3db. And since you would have two filters, each attenuating the signal by -3db, the result would be an attenuation of -6db at 80hz.....hence, it's no longer the effective crossover point.
    Oh but you did explain it more. I was missing the -6db part or was not thinking of it that way until I read it. lol




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