unbreakable audio

Discussion in 'General Electronics Chat' started by Biff383, Aug 14, 2015.

  1. Biff383

    Thread Starter Member

    Jun 6, 2012
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    What can I do to be sure that rented amps and speakers can't be damaged by idiots?

    I realize that someone will reeducate the idiot, but give me some guidelines to over modulation at the input.
     
  2. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    define damage?
    kicked over?
    blown?

    It is 100% impossible to "idiot proof" something.. Idiots will always find a way to be idiots.
     
  3. Biff383

    Thread Starter Member

    Jun 6, 2012
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    I was thinking blown. Speakers or amp. I understand that it will be easier to protect the amp.
     
  4. Papabravo

    Expert

    Feb 24, 2006
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    What exactly did you have in mind that would be even remotely practical.
    1. Speakers that reduce the power amp output?
    2. Power amps that measure the spekaer impedance and adjust the output accordingly?
    Not that I think either of those would be practical.
     
  5. nsaspook

    AAC Fanatic!

    Aug 27, 2009
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    Connect the amps to a power cord (that only you know about) with a inline fuse of about 1 or 2 amps. When some drunk fool cranks it to 11, pop goes the fuse not your speakers and amp. Then look at the drunk fools face. :)
     
  6. Biff383

    Thread Starter Member

    Jun 6, 2012
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    I suppose that it is not possible. I just thought I'd ask the smartest people I know. .......then again.....a lot of them are not awake yet.
     
  7. Biff383

    Thread Starter Member

    Jun 6, 2012
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    Yugh confrontation is not an option. I tend to stay away from people.
     
  8. nsaspook

    AAC Fanatic!

    Aug 27, 2009
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    Then ask "nicely" for the drunk fool to pay $100 for a new amp. (secret fuse)
     
  9. blocco a spirale

    AAC Fanatic!

    Jun 18, 2008
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    Incandescent lamps are sometimes connected in series with drive units, particularly tweeters and midrange units. High currents cause the filament to heat up and its resistance to increase rapidly, thereby, reducing the power to the loudspeaker. It may seem a little crude but it can work very effectively as the filament is subject to the same heating affects as the loudspeaker coil and it's the heat that does the damage.

    There is some useful information on the subject here:

    http://sound.westhost.com/articles/speaker-failure.html
     
    Last edited: Aug 14, 2015
  10. Biff383

    Thread Starter Member

    Jun 6, 2012
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    That sounds good. ..... I cant see anyone doing it though.
     
  11. Biff383

    Thread Starter Member

    Jun 6, 2012
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    That might work with the people that I am dealing with
     
  12. Biff383

    Thread Starter Member

    Jun 6, 2012
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    I can tell them that they are LED's.
     
  13. blocco a spirale

    AAC Fanatic!

    Jun 18, 2008
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    Have a look at the link I just added above....
     
  14. nsaspook

    AAC Fanatic!

    Aug 27, 2009
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    I agree but if you do it loudly in the silence of no music or audio the next fool won't touch the amp and will turn their attention to something else to break like maybe their neck.
     
  15. Biff383

    Thread Starter Member

    Jun 6, 2012
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    Thanks Blocco skimming the article I see a little help.
     
  16. Biff383

    Thread Starter Member

    Jun 6, 2012
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  17. Biff383

    Thread Starter Member

    Jun 6, 2012
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    Cheaper than my neck.
     
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  18. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    For protection tailored to each speaker individually, a bidirectional tranzorb is basically two high power zener diodes in series in a single diode package. If you know the AC voltage peak the speaker can tolerate, a tranzorb across the speaker terminals will clip anything above that no matter what amp is connected. That and a fuse in series with the speaker will turn a small overdrive into distortion, and a large overdrive into silence.

    ak
     
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  19. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Charge the users a hefty deposit up front, non-returnable if the equipment is damaged.
     
    JohnInTX and nsaspook like this.
  20. #12

    Expert

    Nov 30, 2010
    16,343
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    I did that, successfully. I took out the 3 amp speaker fuses and installed 1 amp fuses. The idiot cranked the amp up, exactly as I told him not to do and the fuses blew. :p
     
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