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Coil completely burnt: is a problem of too distorted sound?

Discussion in 'Amps [BG]' started by Invisible, Feb 4, 2014.


  1. Invisible

    Invisible

    Joined:
    Mar 3, 2008
    Location:
    Italy
    i've completely burnt the coil of my Mesa Powerhouse 1x15. The man who fixed it told me "less power please!" But I use it together with a 2x10 (both 8ohm) with a Mesa 400+ or a Mesa MPulse 600, never more than 3.5 of volume. What's the problem? Some friends say to me " too much overdrive, too much fuzz" yes I often use distorted sounds but is it really possible to burn the coil with too much distortion? I use Fulltone bassdrive, ZVez Wolly Mammuth, EBS microbass, sometimes od and fuzz together (!) but I don't do it anymore!
     
  2. Mr. Foxen

    Mr. Foxen

    Joined:
    Jul 24, 2009
    Location:
    Bristol, UK
    Disclosures:
    Amp tinkerer at Ampstack
    Its not the distortion that made the coil burn, but its probably the distortion that made you not notice the speaker distorting that warns you it is being overpowered.
     
  3. Invisible

    Invisible

    Joined:
    Mar 3, 2008
    Location:
    Italy
    1x15 is 400W and 2x10 is 600 W, how I could overpower them with those amps?
     
  4. bassgod0dmw

    bassgod0dmw Supporting Member

    Joined:
    Mar 1, 2007
    Location:
    White Plains
    Realistically they probably take about half of that wattage. Those numbers you listed are probably their thermal rating.

    In any case, you gave it too much power and the speaker blew.
     
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  6. wcriley

    wcriley

    Joined:
    Apr 5, 2010
    Location:
    Western PA
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    Which coil did you burn out?
    The voicecoil in the driver or the inductor in the crossover?
     
  7. Stumbo

    Stumbo Wherever you go, there you are.

    Joined:
    Feb 11, 2008
    Location:
    Los Angeles
    Take a look at fdeck's HPF/pre VIII. It helps protect the speakers low end and will tighten up your tone.

    Btw, the volume knob setting is usually not directly related to how much "wattage" your speaker is receiving. Obviously setting it a 3.5 didn't work out for you so even if you don't use pedals anymore, you still may have a long term problem. Do you amps have limiters/compression built in? Those will also protect your speakers. Check out some reviews/recommendations at at: http://www.ovnilab.com/index.shtml
     
  8. B-string

    B-string Gold Supporting Member

    Joined:
    Nov 21, 2008
    Location:
    Lake Havasu City, Az USA
    All those effects can add gain making my knob was at XX meaningless. As others have said those cab input ratings are thermal not how much power they can take of low end bass. Your 400+ is rated at <5% distortion and will output much more at higher distortion levels.
    You poured too much power into your cabs, realistically (limited by the 15") your total cab power limit was about 400 watts "rms". Double the lowest rated cab when using two cabs at fundamental and second harmonics.
     
  9. dincz

    dincz

    Joined:
    Sep 25, 2010
    Location:
    Czech Republic
    If the voice coils are burnt, it's the thermal rating that was exceeded.
     
  10. bassgod0dmw

    bassgod0dmw Supporting Member

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    Mar 1, 2007
    Location:
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    And that takes away from what I said how?
     
  11. Invisible

    Invisible

    Joined:
    Mar 3, 2008
    Location:
    Italy
    The voice coil, crossover and other parts where ok. I still use pedals, I don't sum different distorsion anymore ;-) I recently bought a Thumpinator to cut frequencies under 30Hz, I hope that will help. It is possible that those cabs are not enough? It' unbelievable... How many cabs have I to use? i don't play in a stadium.
     
  12. B-string

    B-string Gold Supporting Member

    Joined:
    Nov 21, 2008
    Location:
    Lake Havasu City, Az USA
    Not necessarily, thermal limit can also be the point of coil former distortion, enamel burning or adhesive failure if the coil remains inside the motor assembly and is not driven outside of it (where there is no heat transfer to the motor assembly).
     
  13. B-string

    B-string Gold Supporting Member

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    Location:
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    Then what did fail? The voice coil is attached to the speaker cone and that is the only "coil" on a 15" speaker.
     
  14. wcriley

    wcriley

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    Now I'm really confused! :confused:
     
  15. B-string

    B-string Gold Supporting Member

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    Maybe it is an old electro-magnet speaker? :bag:
     
  16. Chainsaw Willie

    Chainsaw Willie

    Joined:
    Nov 6, 2011
    Location:
    Redmond, Washington
    yeah, a field coil! Perhaps the previous owner snuck an Atwater Kent speaker into the cab and the field coil failed.
     
  17. wcriley

    wcriley

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    Only members of the Grumpy Old Farts Club know what a field coil driver is...........
     
  18. dincz

    dincz

    Joined:
    Sep 25, 2010
    Location:
    Czech Republic
    You said:

    Those numbers you listed are probably their thermal rating

    The voice coils overheated - i.e. a thermal problem
     
  19. Invisible

    Invisible

    Joined:
    Mar 3, 2008
    Location:
    Italy
    Well... It's a Mesa Boogie cab! As I saud before people reconing it said "too much power", that's all I know. Last three lives. I did smell like Devil behind me...well now I know it was the coil going away
     
  20. bassgod0dmw

    bassgod0dmw Supporting Member

    Joined:
    Mar 1, 2007
    Location:
    White Plains
    Ummm, yeah. :confused:

    Anyways, OP says the voice coils are fine now.
     
  21. B-string

    B-string Gold Supporting Member

    Joined:
    Nov 21, 2008
    Location:
    Lake Havasu City, Az USA
    With the HV of the 400+ I can understand how it burned. :D
     

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