Question about Mission 782 Main / Stereo Speaker

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Midrange faulty I have a set of Mission 782’s (bought Dec 1999), whereby one of the 13 cm midrange drivers appears to have a problem. It regularly produces a loud resonance, and sometimes a knittering sound, always at about the same midrange frequency. 1 Can I assume that the fault is the driver, or could it be the crossover? 2 The driver is leaking fluid (and has been doing so from the beginning). I understand from the internet that this is a known manufacturing flaw. Will any replacement driver have the same weakness, or has the design been improved? 3 In this context, do I need to replace the midrange driver in the other speaker also? Otherwise I might end up with two unequal drivers (due to manufacturing changes since 1999), or at least one that has been running for 7.5 years, and the other new 4 How to get the right original pieces in Europe? 5 Can I expect the same fluid leakage problem with the 16 cm bass driver, or is this specific for the 13 cm driver? Cheers! VanManen

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  • Anonymous Sep 02, 2008

    Same midrange failure in the left side unit. No leaking fuild to be found or any signs there ever was any though. The 130mm Keraform unit just started to crackle, then cut in and out finally just failing altogether in a span of less then 10 minutes.

  • gcbruk Feb 22, 2009

    Yep - similar problem here as well. Both mid-range units have failed in my 782's, bought new in 2001 (so approx 8 years old). No noticable leak of fluid. They started to work intermittently - seemed to clear if I turned the wick up a little; but then died completely. Just contacted Mission to see what they say - not the kind of life I expect from a pair of £700 speakers!!



    P.S. noticed there's a guy selling replacement units on ebay for approx £40.

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Been there...I've had to replace both my drivers.
I made extensive research on the problem of the mid drivers for the 782 mission speakers.
this is the article with all the needed instructions :
http://totaltechtalks.blogspot.pt/2016/02/mission-782-repair.html

Posted on Feb 20, 2016

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Mission supply an upgrade driver to rectify this problem.

Posted on Mar 21, 2013

I've had the same problem/s. A manufacturing fault with the original midrange drivers of all of my Mission 780's and 782 speakers. If you contact Mission through their website they will supply an updated style driver for about £45, I would recommend buying 2 because the other one will fail eventually, if like me you use them every day. All four failed within two years of each other.

Regards

kingar

Posted on Oct 05, 2008

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1 Answer

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How To Bi-Amp And Bi-Wire Speakers!


What is the difference between bi-wiring and bi-amping?
Bi-wiring is using the same power source (amplifier) but separately connecting that power source to a woofer and a midrange/tweeter on a speaker.

Bi-amping is using two separate power sources (amplifiers) and connecting one amplifier to a woofer and the other amplifier to a midrange/tweeter on a speaker.

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Your speaker must have two separate positive and negative connections (one set for the woofer and one set for the midrange/tweeter). Connect one wire between the positive terminal on the amplifier/receiver the positive terminal on the speaker. Connect the other wire from the negative terminal on the amplifier/receiver to the corresponding negative terminal on the speaker. Remove the jumper straps connecting the two sets of speaker inputs. Repeat this process for the second set of terminals on the speaker, connecting them to the same positive and negative terminals on the receiver/amplifier. Repeat the steps for each speaker you wish to Bi-Wire, connecting them to the appropriate terminals on your receiver/amplifier.

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How do I bi-amp?
Bi-amping is similar to bi-wiring, but involves separate amplifiers: one for the woofer and one for the midrange/tweeter. Passive bi-amping involves a direct hookup between each amplifier and the speaker terminals. True bi-amping involves hooking the preamp to an electronic crossover that replaces the passive crossover network in the speaker. The active crossover then connects to multiple power amplifiers.

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