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Repair a Mackie SRM 450 Speaker The Speaker is making a crackling sound while playing. The sound keeps cracking up.

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You probably need to replace the diaphragm. The diaphragm is located behind the back cap. Simply remove the back cap, remove the diaphragm, clean the voice coil gap with a piece of masking tape, install a new replacement diaphragm, reinstall the back cap. That it!
You can see videos on how to replace diaphragm at this link.
http://www.soundspeakerrepair.com/speaker-parts-c/INST/Installation+Instructions
You can buy a new Mackie SRM450 diaphragm at this link.
http://www.soundspeakerrepair.com/speaker-parts-cp/SRM450-DIA/DIA-Mackie/Mackie/

Posted on Jul 21, 2009

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After hooking up the PA for practice, I heard a loud "pop," then followed by a burn smell, from my Mackie SRM 450 speaker, which I use as a monitor. No sound comes through but static and crackling. Is the...


The pop itself isn't necessarily a bad thing, but a burn smell and the fact that it's only outputting a crackle likely means that the built-in amplifier circuitry has been overloaded. This can happen a few ways:
1) Faulty power, either a bad cord or a bad outlet
2) Plugging the output of a power amplifier into this speaker - because it has a built in amplifier, this speaker only wants a non-powered line input
3) If the Thru output is (accidentally) plugged into anything that provides phantom power, that could overload the circuitry.
4) A short due to liquid or moisture contact - these cabinets are most certainly not waterproof
In any case, the amplifier part of the circuitry IS replaceable. If you're not comfortable buying one and replacing it yourself (I'd recommend eBay), take it to any shop that sells similar items. If you're extremely lucky, it was just a fuse that needs to be replaced, but chances are you'll need to replace the whole amp.

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There is an entire crossover circuit inside that is BEFORE the amp section. There are 2 separate amps: one for HF and one for LF. Can you describe the noise you are hearing in more detail? Is hte sound effected by the gain controls at all? What happens without any input?

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Mackie SRM450 speaker keeps making a 'popping' sound


First thing is to verify that a ground loop from your driving equipment is not causing the problem. Easiest way is to drive it with a BATTERY operated little CD player so no ground loop could exist.

Verify that your power cord is in tight and try another cord to verify it is OK.

Beyond this, service is probably required. If unit is out of warranty, you could have a person open it up to see if anything is obvious.

A possible proble is bad connectors or worse, a cracked circuit board.

Analyzing if noise is from both the woofer and high range speaker is a first step.

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