Question about Mackie SRM-450 System

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Humming problem my brand new mackie once power on gives humming sound and then for awhile it makes a thunderstorm like sound without signal and master vol. completely off.

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  • mabsterdxb Jan 31, 2009

    thanks, but this dubai we always have proper grounding..

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This could be a grounding problem, it might change if you plug it in elsewhere or it might be where you live.

Posted on Jan 29, 2009

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Repaired the LFamp: fet's and power transistors replaced. Now got the same problem: on power on a huge hum (sawtooth) for 2 seconds, and a crackling noise even with no signal fed and gain at ccw. Other speaker is OK, so no mains problem here.
Anyone?
Thanks, Specs

Posted on Dec 07, 2009

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1 Answer

My Mackie SRM-450's both make excessive white noise, one of them crackles quite loudly.


This type of active speaker by Mackie has a issue with operational amplifier ic's inside, they are just those little black things with 8-pin soldered to the pcb, you may have some of them damaged, because of the erratic operation of the units, let me know if i can help more.

Jul 04, 2013 | Mackie SRM-450 System

1 Answer

No sound but all powers up. Signal light stays on.


Internal opamp fault, they look like a little spiders, 8 pin each, some of them got fried internally is a common srm450 issue, hope this helps.

Jan 28, 2013 | Mackie SRM-450 System

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

2 Answers

I have mackie srm 450 powered speakers i think xlr female connector bad when i move cable horn comes on for awhile then goes off move and comes back on


HI, thanks for posting your Question..What makes the horn top speaker goes off and on is because the the connector that the XLR goes into is losing contact , it needs to be checked...

Also sometimes it might be from a loosed wire..So you will need too pen up the horn speaker cabinet to check it out..

Sep 19, 2011 | Mackie SRM-450 System

2 Answers

The tweeter of my mackie srm 450 V2 makes a quite loud noise (humm). this nois was there right from the beginning, and mackie told me, that this was usual....the older 450´s did not make this kind of...


The latest 450v2 include this metal portion 1 to isolate AC lines over IC's, metal part 2 is include in all versions, some technician remove them and that creates more hum at idle levels, by having both the latest 450v2's are the quietest of the v2's.
V1 did not use switching power supply, they use discrete circuit and that is why they are a bit quieter
tweeter-mackie-5t215me55uezwm4wwbbpfxqh-3-0.jpg

Aug 04, 2010 | Mackie SRM-450 System

1 Answer

Ould some one send me a copy of that schematic. I


Sorry, not really a solution yet. Just contacted the Belgium Service center. They say they're not allowed to give the schematics. Maybe Mackie is ashamed to show what's in it? Any way, this is all but a good publicity for the service of Mackie
Gerdy
Gerdy's Music Shop
Belgium
gerdy@gerdysmusicshop.be

Nov 07, 2009 | Mackie SWA1801 Subwoofer

1 Answer

Humming speakers


If you disconnect the signal leads and the hum is away, it's probably a groundloop problem, or your equipment is generating the hum.
If it does not go away, the amps are defective

Sep 23, 2009 | Mackie SRM-450 System

1 Answer

Mackie srm450 not making any sound at all


It sounds like the thermostat didn't shut the speakers down before they were damaged. There is probably a very fine wire leading to the speaker coils which is burned/broken. Fixing this broken connection my solve the problem unless the coil itself is damaged.

Another possibility is that the crossover circuitry in the speaker cabinet is damaged from overheating.

Sounds like you need a service tech to look at the bad speaker, unless you want to tackle the job.

Apr 22, 2009 | Mackie SWA1501 Subwoofer

1 Answer

Signal light stays on, no sound output


T14 is part of the +15v power supply that feeds the input board.
It is actually a transistor.
If this is the only problem on the board, then this transistor could be resoldered back on but you will have to make sure it tests OK and it attaches to the heatsink the same way it came off. ie make sure it is electrically isolated from the heatsink
It seems if there is no fuses blown on the power amp board you might be one of the lucky ones.
In my opinion this amp is a clever design but is under-engineered for robustness

Aug 09, 2008 | Mackie SWA1501 Subwoofer

2 Answers

No sound


Willing to bet you've blown the amp, or fused the coil. I've had it happen twice, apparently when running off a power source that apparently couldn't handle the load. Hope it's under warranty - if so Loud Technologies (deals with all Mackies warranty stuff) should be able to replace the unit. Otherwise, you'll need to take it in to a service department and have it checked out.

Good luck, you'll have to arm wrestle with them to get them to replace it.

Jun 12, 2008 | Mackie SWA1801 Subwoofer

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