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  1. #1

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    Question burnt voice-coil

    what could be the cause of the burnt voice coil in the SCV momo's? any detailed explination will help to prevent another sub
    Last edited by Unicode2021; 05-04-2005 at 11:16 PM.

  2. #2

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    before you put the other one in the box
    put some ice packs on the terminals man. that prevents it from getting burnt by making it more susceptable to heat.


    ^^^j/k

    maybe enclosure size???
    cats.vans.bag...

  3. #3

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    who makes a good box for the momo's? and what is a good size?

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    i don't know seriously man. wait for other people's opinions...

    :D :D :D

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    a good size for a 12" momo is .88 ft^3, sealed, as per the manufacturer's recs. a good boxbuilder is you, if you're patient and decently skilful. other than that, someone can provide you with the names of good builders.

    a burnt vc can be from too much power, too much clipping, too big a box, bad wiring, bad breakin, etc. etc....
    It's not good, very fundamentally simply not good. - geolemon

    "Its not good enough until we have real-time fearmongering. I want my fear mongered as it happens." - Shizelbs

  6. #6

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    Originally posted by neomagus00
    a good size for a 12" momo is .88 ft^3, sealed, as per the manufacturer's recs. a good boxbuilder is you, if you're patient and decently skilful. other than that, someone can provide you with the names of good builders.

    a burnt vc can be from too much power, too much clipping, too big a box, bad wiring, bad breakin, etc. etc....
    phil at woodlawn cabinetry...
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  7. #7

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    VC's get burnt when they receive more heat than they can dissipate. This is usually due to clipping, or pushing the sub past the excursion limits. In both cases, the VC is receiving additional power, but isn't moving more, thus no way to shed the excess heat.
    http://www.silverdragon.com/punkie/c...net.idiot.html - Read it, know it

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  8. #8

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    pushing the sub past its excursion limits will not cause a VC to burn up...but usually, if youre pushing your sub past its excursion limits youre doing something wrong like too much power which could cause it to burn up
    -Cody
    Music is like candy, you have to get rid of the rappers to enjoy it

  9. #9

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    Cody is right.

    There are 4 things that kill a speaker.

    1- You stick a screwdriver thru the cone
    2- You use too much power and build up more heat in the VC than it can safely dissipate.
    3- You use too much power and cause the speaker to move further than its suspension will allow.
    4- You let Cody use it for a few weeks.

    :D
    polkaudio sound quality competitor since 2005
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  10. #10

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    Not enough power + distortion = boom

    To much power + over-driven = boom
    www.Vr3Mods.com ///// www.Version3Audio.com

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro

  11. #11

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    Originally posted by Vr3MxStyler2k3
    Not enough power + distortion = boom
    if its below the speakers limits, you can play it distorted all day....
    -Cody
    Music is like candy, you have to get rid of the rappers to enjoy it

  12. #12

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    Originally posted by MacLeod
    4- You let Cody use it for a few weeks.

    :D
    ROFL
    Quote Originally Posted by George Grand View Post
    Quote Originally Posted by Jstas View Post
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  13. #13

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    Originally posted by exalted512
    if its below the speakers limits, you can play it distorted all day....
    -Cody
    But why would u want to?
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  14. #14

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    you wouldn't, but it happens a lot
    It's not good, very fundamentally simply not good. - geolemon

    "Its not good enough until we have real-time fearmongering. I want my fear mongered as it happens." - Shizelbs

  15. #15

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    Originally posted by Vr3MxStyler2k3
    But why would u want to?
    not saying youd want to, just saying it wouldnt kill it

    and F all the Cody haters around here
    y'all are just jealous :p
    -Cody
    Music is like candy, you have to get rid of the rappers to enjoy it

  16. #16

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    Distortion doesnt hurt speakers as long as its below their limits. A speaker doensnt know the difference between a distorted or clean signal. It just plays what the amp tells it to. You can crank a 10 watt head unit into maximum distorted cliiping all day long to a set of 150 watt speakers and theyll never so much as whimper.

    Hell I do it 10-12 hours a day. My work truck has a stock Panasonic POS AM/FM radio but since the stock speakers were dead it has some cheap aftermarket Pioneer (I think) coaxials in there. I drive around all day with the radio literally turned all the way up to max, where the volume knob stops. Its sounds like **** but I can hear it over the noisy ass diesel. The speakers can handle at least 50 watts and my crappy radio will never make more than 10-20 so the speakers are never bothered, just my ears!

    The reason people associate distortion with speaker death is reason #3. When you deliver too much power to the speaker and it is pushed beyond the limits of its suspension, it distorts signalling its eventual demise. But when sending a distorted signal from a puny head unit to a tough speaker youll never hurt it.

    And Cody, why should I be jealous? Ive got a bigger post count!! :p :D
    polkaudio sound quality competitor since 2005
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  17. #17

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    Originally posted by MacLeod
    And Cody, why should I be jealous? Ive got a bigger post count!! :p :D

    It finally happened!!
    Where have you been doing all that posting???
    Quote Originally Posted by George Grand View Post
    Quote Originally Posted by Jstas View Post
    Simple question. If you had a cool million bucks, what would you do with it?
    Wonder WTF happened to the rest of my money.
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  18. #18

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    90% have been here.

    Ill post in the Clubhouse a few times and maybe in the movies section but most of my time is spent on this side.

    Plus I have no life and Cody does. :(
    Last edited by MacLeod; 05-06-2005 at 05:30 PM.
    polkaudio sound quality competitor since 2005
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  19. #19

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    LOL

    Nah; you've got no life AND a great car audio system!







    :p :D :D








    please don't hurt me......
    Quote Originally Posted by George Grand View Post
    Quote Originally Posted by Jstas View Post
    Simple question. If you had a cool million bucks, what would you do with it?
    Wonder WTF happened to the rest of my money.
    My Saga
    Equipment Pictures

    [2CH]
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    Yamaha KX-W900U
    Sony ST-S500ES
    Denon DP-7F
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    Klipsch RF-35


    [In Storage]
    Yamaha CDR-HD1300
    ASL Wave 20 monoblocks
    Pro-Ject Phono Box MKII


    [Car System]
    Pioneer Premier DEH-P860MP
    Memphis 16-MCA3004
    Boston Acoustic RC520

  20. #20

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    Not great yet. Still need a sub, and my imaging sucks cause my doors are 15 feet apart!
    polkaudio sound quality competitor since 2005
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  21. #21

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    If you're pushing a speaker past its excursion limits, the cone is stopping while it's still receiving power from the amp. That is, in effect, clipping, which will overheat and burn a VC. That was my point.

    Like Mac said, distortion is completely harmless (except to your ears). It's a common myth that distortion will damage speakers. That is completely false. Heck, any electric guitar gets its sound from distortion. Any sound that isn't a pure sine wave could be considered distortion. Speakers are MADE to play distortion. That's about all they do.

    Clipping and overpowering kill speakers. That's it. Well, that and a screwdriver through the cone :)

    -Austin
    http://www.silverdragon.com/punkie/c...net.idiot.html - Read it, know it

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  22. #22

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    Originally posted by AustinKP
    If you're pushing a speaker past its excursion limits, the cone is stopping while it's still receiving power from the amp. That is, in effect, clipping, which will overheat and burn a VC. That was my point.

    Like Mac said, distortion is completely harmless (except to your ears). It's a common myth that distortion will damage speakers. That is completely false. Heck, any electric guitar gets its sound from distortion. Any sound that isn't a pure sine wave could be considered distortion. Speakers are MADE to play distortion. That's about all they do.

    Clipping and overpowering kill speakers. That's it. Well, that and a screwdriver through the cone :)

    -Austin
    ....and Cody! :p :p :p
    polkaudio sound quality competitor since 2005
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  23. #23

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    youre jealous because my truck sounds better than yours...AND its a GM:p
    and you still have to get another 1800 posts before you pass me up buddy!
    -Cody
    Music is like candy, you have to get rid of the rappers to enjoy it

  24. #24

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    I dunno what youre talking about. Ive no proof you had this other SN. :D

    I dont know about sounding better either. Yours is much louder and youve got a lot higher end equipment in there but Id give you a run on straight SQ. ;)
    polkaudio sound quality competitor since 2005
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  25. #25
    jdlspl
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    Default momo voice coil breakage

    The problem with the momo line is in the spider wire itself. this sub is made china with the cheapest parts available. I have went through 16 mm12 in my demo vehicle. I hate to say it but the momo line does not even belong in the competition word. Dont get me wrong they are some the best sounding subs I have ever used. I have used over 6 different brands over the past years. The weakest link in the momo line is its spider wire. If polk would beef up its product it would be able to hang in the spl world. I have seen some of the spl subs and amps polk is prototiping and maybe the will be stronger.

  26. #26

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    Yup, the MM12 is pretty puny. However the new Momo line has had none of those problems.

    Apparantly there was just a problem with the MM12 cause in the 2 years the MM2's have been out Ive not seen any complaints on this board and know of none personally.
    polkaudio sound quality competitor since 2005
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  27. #27

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    umm, i dont really think you know what youre talking about to tell you the truth. the mm12, even if made beefier, would never last in the spl world. their sound quality is average. and you cant spell prototype.
    that is all
    -Cody
    Music is like candy, you have to get rid of the rappers to enjoy it

  28. #28

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    mac, what is this mm2 you speak of?

    and dude - wouldn't you figure out that you were going with the wrong sub after you blew FIFTEEN subs? did it really take that sixteenth to drive the point home? and momos are not SPL... duh...
    It's not good, very fundamentally simply not good. - geolemon

    "Its not good enough until we have real-time fearmongering. I want my fear mongered as it happens." - Shizelbs

  29. #29

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    Exclamation

    OK, well heres the deal with the MM12, my setup is the momo C500.1 and a single MM12 (SVC) wired for 4ohm I have the gain down realy low on the amp and im using the remote gain @ that, so my understanding is that once the remote gain control is pluged in, then the master gain is disabled (Please correct me if im wrong) now...i am running a cheep pioneer head unit (35w X 4) i run the volume in the headunit @ about volume #25 and which is about half volume but if i take it any higher than the like #35 "BOOM" my **** blows but #25 just dont hit enough and #30 sounds good but im pushing my luck there, But!...i have just orderd 2 MM12(DVC) and i am going to wire them in a 2ohm setup, the next question is would it be advised to wire the sub's on there own channel or to wire them on just the #1sub terminal? and given the senerio can any one narrow down the reason for a burned VC and what are the advantages of the MM12(DVC) over the MM12(SVC) and why are they the same price?

  30. #30

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    the DVC simply allows for different wiring options. and it's easier to wire one sub into each output of the 500.1, those outputs are internally paralleled.

    unfortunately, you've ordered a combination that will allow only a 1 ohm or a 4 ohm, and the net result is that you will achieve no additional performance - you'll have the same power as you do now, divided into 2 subs.

    a better choice is to keep your SVC, and order another one. you can then wire each to its own terminal and get 250 watts apiece instead of 175. (that's rated power, add about 50 watts for real-world power).

    and to set your gains properly, go here
    It's not good, very fundamentally simply not good. - geolemon

    "Its not good enough until we have real-time fearmongering. I want my fear mongered as it happens." - Shizelbs

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