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Mackie SRM 1801 powered sub problem. Second time I connected the sub to my system the OL light came on and I could smell burnt electronics with very little volume being sent through the signal. These are relatively new as I only purchased them within the last few months and they have gotten very minimal use. The sub still produces sound however I didn't want to further damage anything so it remains unplugged untill I can find a solution.... My question is... What could have caused this in a virtually new speaker and is there anything I could've done to cause/avoid this.... Thanx, ApexDuBB

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Your powered sub entered protect mode (apparently permanent) as a result of being overloaded.

Posted on Apr 17, 2017


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Posted on Jan 02, 2017

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SOURCE: Mackie 1501 sub immediatley shuts down after powering up.

Hi There, There are 3 internal fuses to check that clip onto the main amp board. You can access them by undoing the two screws that are on the top and the bottom of the sub. They have flat large heads and you will need a hex key to unscrew them. If it is one of the fuses that has gone it will either be discoloured as in burnt or you will see the metal inside has split. Simply replace these with a new fuse and hey presto you should be back up and running. You might also want to check that none of the push on cable ends have dropped off fom the board as this may also stop connection going through. If you need any parts for the sub or fuses then will be able to supply them (that is if you're in the UK). Hope this helps. Grant (from

Posted on Mar 24, 2009

  • 133 Answers

SOURCE: I have Mackie srm 450 original the speaker

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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SOURCE: My Infinity sub-woofer for my home surround sound

Open it up and see what is in there! You might find a fuse blown. It might have just blown, without a fault, if you are lucky. If not check out the part numbers on the amp board. All semiconductors numbers, then put the numbers into google. You will soon find out if they are obtainable!

Posted on Jan 20, 2010

  • 1 Answer

SOURCE: Mackie SRM-450 tweeter distorts sound

I wish to change access to the diaphragm

Posted on Jun 16, 2010

  • 4234 Answers

SOURCE: hello there i have a

The most common cause of this is a blown horn. A replacement can be ordered from Mackie directly. Remove the screws that hold the plastic horn in place. At the rear of this part will be the tweeter assembly that unscrews from the horn. This needs to be replaced.

Another possibility is that the tweeter driver has broken from the horn itself and is inside the cabinet. Remove the horn and you may find that the aluminum part has broken. Replace the horn which comes with that part and you should be fine.


Posted on Jan 12, 2011

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1 Answer

The OL and THERMAL LEDs turn on quickly after an even very low level signal input.

These subs are renowned for problems. The PSU and the output stages as well as the main driver are all weak and there are a number of companies that will upgrade them and sort out other issues such as vibrations. Assuming it is out of warranty and you really want to use this you would be best going to a specialist repairer to get it sorted not Mackie.

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Yes, you can use the A output, as long as you're OK with it being a mono system. It may be helpful to read the manual which has a lot of info including possible setup configurations. Here's a link-

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It is likely that the O/P transistors have blown, especially if the fuse keeps blowing and the O/L led comes on. It's a repair shop jobbie

Nov 30, 2011 | Mackie SRM 1801

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Where can i buy parts for my mackie srm 450 powered speakers

This speaker has a very commercial not-hard-to-find electronics, so you can try Mouser, newark electronics, D'Albani corporation, even Radio Shack, hope this helps.

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Led's don't power and there seems to be a pulsing coming from inside the unit, even after it's powered off the pulsing continues but gets more and more faint. This sub worked fine a day ago,...

Likely the amp blew and the power supply is being overloaded and keeps trying to power on but finds an overload and continues as the power goes away. This is NOT a DIY unless your are electronically adept.

Jul 14, 2011 | Mackie SRM 1801

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The amp is likely blown. This is not DIY unless you are competent at electronics.

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Go from the main outs on your mixer to the input on the 1801. With an XLR, connect the 'high pass' output on the 1801 to the input on the 450 on top of it.

Jan 09, 2011 | Mackie SRM-450 System

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