Question about Mackie SRM-450 System

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Mackie srm450 v2 no top end.

No top end from Mackie, ive tried another amp in the speaker and it works fine, its not the fuse, so im thinking something may have blown. I also have another Mackie which works fine.. until u push it ... then it distorts like crazy, nothing is blown in that speaker as I have tried the parts in another.. I have 5 srm 450's and 3 are faulty. any advice greatly appreciated. Jamie.

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  • 57 Answers

Check the aspect of the crossover filter for the speakers, inside. Sometimes they fry.

Posted on Apr 27, 2014

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Posted on Jan 02, 2017

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SOURCE: mackie srm450 the tops on one speaker is not working

Hi There, This is quite a common problem with the Mackie SRM450's. You will find that you need to replace the diaphram on the top. This can be done by removing the 16 screws from the back of the Mackie (quite a long pain in the **** job) with a long handled cross head screw driver.

Once you have done this you should then remove the hex bolts from the back of the drive where the black and right terminals are. When this is done, pull off the cover and swap the diaphram out. With the new diaphram in place reverse the steps above but before you screw the back on, power it up carefully and check the sound is now working.

If the diaphram keeps going eg every 3 to 4 months then you will need to change the driver which is quite expensive to do. If you need spares and are based in the UK, contact LondonSpeakerShop.com who carry spare parts or can undertake the repair.

Hope this helps.

Posted on Mar 05, 2009

  • 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.

Dan

Posted on Jan 12, 2011

  • 4234 Answers

SOURCE: how to open a Mackie SRM450

Sorry about the late response. These units are sealed at the factory and opening them up for the first time is a bit of work. Make sure that all the screws are out of the unit and using a large screwdriver, carefully pry up one side. It will be difficult. Apply steady pressure and the back will eventually free up.

Dan

Posted on Jan 30, 2011

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1 Answer

Mackie srm450 no output


Probably the internal fuse or the amp blown. If these are the MK1 they are notoriously unreliable and you can't even change the fuse without stripping the thing down. Sound OK when working but don't expect them to keep working if you want to drive them hard. I know of some people who have changed them to passive and put a crossover in them (I suppose it at least means you have a speaker but defeats the object of active) There are plenty of independents who fix these as they are so problematic but if you can get a pair of decent speakers. The MKII is supposed to be much better but still has some issues with reliability.

Jun 30, 2014 | Mackie SRM450 PA Speaker

1 Answer

Mackie 450 thermal light on no sound


could you give some more info? what are your running into your speaker? and how exactly is it run? once we weed out common issues like switched up cables, than we can move on to internals.
which on that note, I think this is a manufacturing defect


here's a link to the schematic if you want to go poking around the circuits.....


http://www.mediafire.com/?myion3zkxn3


or
http://www.mediafire.com/file/myion3zkxn3/Mackie-SRM450 actspk.pdf



take a resistance test between D56 pin1 and Q35 pin2. thats where this issue seems to be stemming from from ones ive worked on. I have know it to be an internal track that was broken and needed to be glued back down. definitely not the first time ive seen this....

Dec 07, 2012 | Mackie SRM-450 System

1 Answer

What size internal fuse on mackie srm450v2 speaker


Mackie say this is not a user service part. If the fuse has blown there is probably a fault in the unit being their reasoning. I know for certain they tend to blow for no apparent reason so it is worth giving it a go. They are 5 x 20 Slow or time fuses. 7A for 120V and 4A for 230V

Jul 13, 2011 | Mackie Srm450v2 Srm V2 Active Speaker...

1 Answer

ONLY GETTING MUFFLED SOUND FROM ONE OF MY MACKIE SRM V2 SPEAKERS,HAVE CHANGED DIAPHRAM BUT PROBLEM STILL THERE


If you've changed the tweeter and the sound is still muffled the fault is with the HF amp, or the cross-over. You will have to send the amp assembly for repair as it is all surface mount components in there -nothing you will be able to fix yourself. Sorry for the bad news!

May 04, 2011 | Mackie Srm450v2 Srm V2 Active Speaker...

1 Answer

I have Mackie SRM450v2 speakers, one has no power, I think the fuse has blown, it it possible for me to change this myself? The manual says it's not user serviceable.


Chances are if the fuse has blown, there are failed electronic components that caused the failure.

Here is a service manual that will be CLOSE to your unit, though not exact:

http://elektrotanya.com/mackie_srm450_active_speaker.rar/download.html

Scroll down to the "Get Manual" on the site and click on the link. The file is compressed. The first part is the schematic, the second the assembly and parts list. Likely the main low freq power amp has shorted transistors.

Apr 24, 2011 | Mackie Srm450v2 Srm V2 Active Speaker...

1 Answer

Problem with Mackie SRM450V2: HFsignal bleeding through LF driver,low HF OUTPUT also. Filter problem i suspect.


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?

Thanks,
Dan

Feb 10, 2011 | Mackie Srm450v2 Srm V2 Active Speaker...

2 Answers

Mackie SRM450 won't power on.


I am also getting the same problem. Complete power off. Was working like a dream. No given signs that this would cut off. Sent this for repair, the current quote is £160.00 for the amp module to be repaired. I was hoping to find somewhere that can supply, repair, or change for much less; considering that It is worth est £250.00 second hand!

Jun 06, 2009 | Mackie SRM-450 System

1 Answer

Mackie srm450 the tops on one speaker is not working


Hi There, This is quite a common problem with the Mackie SRM450's. You will find that you need to replace the diaphram on the top. This can be done by removing the 16 screws from the back of the Mackie (quite a long pain in the **** job) with a long handled cross head screw driver.

Once you have done this you should then remove the hex bolts from the back of the drive where the black and right terminals are. When this is done, pull off the cover and swap the diaphram out. With the new diaphram in place reverse the steps above but before you screw the back on, power it up carefully and check the sound is now working.

If the diaphram keeps going eg every 3 to 4 months then you will need to change the driver which is quite expensive to do. If you need spares and are based in the UK, contact LondonSpeakerShop.com who carry spare parts or can undertake the repair.

Hope this helps.

Feb 22, 2009 | Mackie SWA1501 Subwoofer

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