Question about Mackie SRM-450 System

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I have Mackie srm 450 original the speaker

I have Mackie srm 450 original the speaker comes on for while from start then will go-off then back on intermittently
If I switch it off then back on then sometimes it returns to power.
Doesnt seem to be like previous fault where the 'soldering of the legs' on circuit board solved prob.
As that usually made 'fault sound' this has no 'fault sound' just off..on as if lead is prob but new leads tried.
Any ideas? and or quote or nearby help
I am in Newcastle on Tyne --Sunderland area
terry Slesser

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When it goes off, try pressing gently on the speaker membrane (you'll probably need to remove the protective mesh to do that).

If the speaker comes on for an instant or so when you press the membrane, then the cause is a broken braid wire at the back of the speaker (it goes from the connection terminal on the speaker itself to the speaker cone where it is connected to the speaker coil wire and glued to the cone to keep it firmly in place).

If this turns out to be the case, the braid can be resoldered at the point where it is damaged / broken (you need good soldering skills to do it, also the braid needs to be cleaned well which is a bit tricky because of its structure, and solder won't stick to it well if it's not clean).

The solder point should be firm, but as small and short as possible because the braid needs to remain flexible at all times since it moves when the speaker is operating.

An alternative to braid resoldering is to replace the speaker, but there may be speaker repair shops around where you can get it fixed.

The problem may as well be something else, the above is just one of the things that you can check and possibly fix by yourself.


3rq8 (Triarcuate)

Posted on Sep 11, 2009

Testimonial: "sounds feasible will look into that soon altho away for some weeks yet so cant try immediatly TS"

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Lookin backs ex roady here. Terry dose the horn go off as well? dose the main driver go off are dose it sound really low? the common faults with these is the capacitor's, either dry joints are drying out,
Have two of these here with low volume and scratchy speaker'
I've replaced the capacitor's which sorted the low volume, now got to locate a driver

Posted on Sep 21, 2009


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