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Mission m73 with a woofer which seems to have gone dead

I have had a pair of Mission m73 speakers for about 10 years, and noticed yesterday that the left channel woofer isn't emitting any sound. I've checked the connections which were OK, swapped the speakers around and right works where left didn't and left still doesn't work in right's position, so I've now dismantled the woofer to check visible damage and try the AAA battery pop test... and I think the woofer is definitely dead. I've been reading on forums this morning and people tend to say that woofers don't just die like that, and the tweeter will normally die first... So what's my problem, and how do I solve it? Please? Can i replace the woofer? They seem hard to source on internet?

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I use to have some warfdales that did that, and generally it was the cross over unit that would blow a fuse, if fitted.

Posted on Dec 26, 2013

  • Chris Ackland
    Chris Ackland Dec 27, 2013

    Thanks for the advice Tim. Do you know where I'd find the crossover unit and associated fuse(s), and what they'd look like?



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Posted on Jan 02, 2017

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SOURCE: Lost woofer in one cabinet.

I'm not familiar with your specific model, but some of these have fuses for the woofers. Check for a blown safety fuse. Also, verify that the connections to the crossover board are in good shape. These crossovers are not that complex and don't usually fail. Keep us posted on what you find.

Posted on May 29, 2008

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SOURCE: JBL speaker's woofer occasionally cuts out - tweeter still works.

Your driver has a damaged voice coil, you can either find a speaker repairer to replace the voice coil or find a replacement driver to fit.

Posted on Mar 07, 2012

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you need to either add the tweeter/bass bridges or your bass drivers are gubbed

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First try swapping the cables and put the left speaker cables in the right hand amp output and the right speaker in he left output. If the problem stays in the right hand speaker and does not move to the left as I suspect should, then it is a problem with your speaker crossovers. You may have to open up the speaker and check the wiring and then crossover. If the problem changes and appears in the left hand speaker you have an amp problem.

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If these are Mission 780s your talking about, you're not the only one. The woofers supplied with the speakers originally have a known design/manufacturing flaw causing them to go "open circuit" after a few years use. The good news is that IAG (who now own Mission) can supply you with a pair of replacements for about £45 plus postage. (You'd be forgiven for thinking they should supply the replacements for free given the cost of these speakers new and the fact this is a design/manufacturing fault). Replacing your woofers is easy. Take off the front baffle. Remove the four rubber plugs that the baffle attaches too, and take out the 4 screws you'll find behind them. Now ease off the plastic moulded front pannel. Remove the four screws holding the woofer in place. Pull the spade connectors from their tags on the back of the speaker. Put the new woofer in by following this proceedure in reverse.

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