Question about Mission 780 Main / Stereo Speaker

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Mission 780 speaker...Is it blown

Weird problem.I get a very low volume,, all treble sound when I play a CD.
I turn up the volume at the amp and one of the speakers come fullrange while the other side shows flashes or sparks in the cone region of the main top speaker/driver.These speakers are powered by a NAD 350 and have very little use since bought a few years ago.Any advice would be appreciated, but I am not a techie. Thanks Phil

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  • Anonymous Jul 15, 2008

    I have practically the same problem - minus the sparks!


    I have narrowed it down to one of the Keraform drivers not working, swapping the driver to the other speaker takes the problem with it


    You can get replacement drivers on eBay from the UK


    Good luck!

  • Reetta Oct 13, 2008

    I have exactly the same problem! I thought it was the woofer problem mentioned in some other problem log, is it not? Weird thing is, that sometimes sound is normal and after a while it goes back to that low volume - all treble sound. Sometimes one speaker is ok, most of the time they both go at the same time. Sorry I'm totally useless with any of the technical stuff. Where are those drivers, inside the speakers? Are they easy to change? How?

  • rarbanas Dec 17, 2008

    I have exactly the same problem! Weak, all treble sound - I've suspected that something was wrong with my Harman Kardon amp, but the repair shop thorughly tested it and concluded - nothing wrong with the amp.. So, It is definitely speaker problem - help needed...

  • Anonymous Dec 17, 2008

    I have the same problem i have had one fixed but the other has done the same thing it is a problem with the flux used to conect the wires on the drive cone i have replaced both drive cones .

  • docphil Dec 20, 2008

    brought it to a tech in phillips shop Dame St Dublin.John McDonald
    got it sorted; new driver and the speaker is as new fo 80 euro.I am poorer but happy and enjoying the quality.No worries, happy camper.
    Doc Phil



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I had the same thing it is a problem with the flux that was used on the drive cone to connect it to the outer case had this with both speakers change the drive cone.

Posted on Dec 17, 2008

  • leedmellor Dec 17, 2008

    sorry that will have blow your channel too or tripped it,

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