Question about Mission 78C Center Speaker

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Mission 78C Centre - no bass

After 7 years service my 78C centre speaker has suddenly stopped working. You can still hear a tinny output but no bass and no real volume. Wonder if the midrange crossover has failed - as it has 3 tweeters and 2 midrange speakers seems highly unlikley that driver failure is the problem ? I have checked its not the amp. [Note I posted this in the mission 77 area by mistake]

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  • john62784 Mar 19, 2009

    I seem to have the same problem, no base and very tinny. As I have the speaker biwired I unplugged the base and found the sound to still be tinny. when I plugged the cables into the base their was no sound so I can only conclude that the crossover has failed as I can't believe both drivers would go at the same time. Time for it to go to a repair shop for proper testing.

  • nickgillies Mar 21, 2009

    Same problem - also intermittent loss of bass on my two front speakers (Mission 780). Changed my Amp thinking that was the problem but no joy. Speakers sound tinny. My speakers are Bi-wired and Amp is Denon 3803. All speakers worked fine for three to four years. My system is used only occasionally.

  • sted11 May 07, 2009

    Same for me, not intermittent.
    I had the same conclusion: it is a crossover issue.
    Did you try to repair it by yourself?


  • erithan Dec 18, 2009

    I've got the same problem with my Mission 780s. Does anyone know how to fix the crossover?

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2 Suggested Answers

Icebassman 5
  • 57 Answers

SOURCE: Mission 780s (from early 1990s) tweeter gone?

Hi there.
Do you have the make and number on the back of the magnet?
Check if the tweeter is at all available on the net!
To have it repaired is also an option.
Iceman.

Posted on Nov 05, 2009

  • 352 Answers

SOURCE: Mission 78C Centre Speaker Only sound is coming

Hello.
The most likely cause is the Crossover unit inside the speaker has failed, It is possible that a wire has come loose also inside the unit. The Crossover unit is what separates the High Frequency sounds from the Mid and Bass Frequencies, if this unit has failed or a wire has come loose then it will cause your problem.
By Unscrewing one of the outer speakers you should be able to see the wiring. trace the two wires from these outer speakers back to there first join, make sure it is connected correctly.
There should be two wires coming into the back of the box, then directly to the crossover unit. from this crossover wires to each individual speaker.
I hope this helps your problem Regards GM

Posted on May 28, 2011

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