Mackie MR8 150W 8 Active Two-Way Studio Monitor MR8 Logo

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Ash Surtee Posted on Sep 21, 2012

Mackie MR8 MK1, making a buzzing noise and no sound?

Hi everyone, I've got a pair of Mackie MR8 MK1 Active Monitors, one seems to work fine though the other has stopped working! The faulty one make a low buzzing noise, with no audio sound out put. Please can anyone advise me on what it could be or how to repair it? I have been told it could be bad capacitors? I would be grateful if some one can give me some advice? Regards,

  • Ash Surtee
    Ash Surtee Jan 04, 2013

    Hi everyone, I replaced the main capacitors it seems to be still buzzing, though slightly differently. When I turn the volume up you can hear it buzzing get louder, therefore i think it must be the internal AMP. I have replaced the external power cord and the audio input and it still buzzing! Can anyone give me any ideals on what it could be?

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5 Related Answers

Anonymous

  • 4234 Answers
  • Posted on Apr 09, 2009

SOURCE: Right side audio cutting out on a Mackie 32-8 mixer board

Try cleaning al of the sliders using an electronics cleaning spray. Choose one that contains a lubricant as well. Dirty sliders can cause this especially at low volume levels. If that does not cure the problem, there may be a defective IC inside the unit. Many mixers use opamp ICs as buffers and final stage amplifiers. These are inexpensive and can fail in that manner. Without knowing the specific make and model ogf your unit, I can't give you any details. Please post the make and model and I'll try to provide additional possibilities.

Dan

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Anonymous

  • 73 Answers
  • Posted on Jul 11, 2009

SOURCE: i have a mackie 32.8

Hi there. Disconnect all auxiliary inputs. Still buzzing? Internal problem. Not buzzing? External problem.
Thanks
Paul

Fred Yearian

  • 5603 Answers
  • Posted on Sep 22, 2009

SOURCE: I have mackie mr8's my left one, when powered on

Sounds like a ground loop. MAKE SURE ALL of your equipment is fed from the SAME receptacle. Make sure the ground pin on the power cable is good (try another cord or swap). Swap the audio cable to verify the cable has a good ground.

Anonymous

  • 1 Answer
  • Posted on Dec 20, 2009

SOURCE: How do I replace the tweeters for the mackie mr8

I built a web page on how to replace the tweeter on the MR8. Lots of good photos to help you with this problem. You can find it at: http://www.idahomojo.com/IdahoMojo/Mackie_MR8_Tweeter_Replacement.html Hope it works out for you!

Fred Yearian

  • 5603 Answers
  • Posted on Jan 25, 2010

SOURCE: i have a mackie cfx 12 mk11 mixer and have a

Yes, there are chips in the unit and any COMPETENT tech should be able to repair.

Since both the XLR and the jack are bad, this implies something more.

USUALLY Mackie drives the XLR and the unbalanced jack seperately so the problem would be what drives the unbalanced jack.

CHECK if you have output at the UTILITY left output jack. If you do, the driver chip for the left output main is the problem.

If you don't, the problem may back up farther into the EQ.

A LOT of troubleshooting can be done on these by using the block diagram in your manual showing signal paths.

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0helpful
1answer

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.
0helpful
1answer

Hi, I have a Mackie MR8 that isn't putting out sound anymore.

I assume that you switched L and R monitors to verify the problem and so I would say that you have a amplifier failure issue. Knowing Mackie, they're probably using an output IC for amplication which although it took some time, has now completely died.

Me being an old-timer I can honestly say....Oh how I miss the discrete transistor and "thru-hole" component mounting days.
0helpful
2answers

One of my MR8's has only its tweeter working, im guessing the bass driver might be blown? How can i test this though and be sure it is the bass driver and not just a simple electrical fault?

Open the unit and remove one wire from one of the woofer terminals and using an ohmmeter check the resistance between the terminals. It probably should be between 6 and 16 ohms... they don't give the specs on the speaker... if it is very high or infinite resistance, the voice coil is blown and you be re-coning or buying new speaker. These are close in speakers and intended for a small room for studio listening while mixing. If the speaker is OK, then the bass amp in the cabinet has a failure... pray, as that is cheaper to repair than a speaker.
0helpful
1answer

Hi, I have a problem with both of my Mackie MR8s. They both play really quiet, like ridiculously quiet with no low end at all. They don't make that "clicking" sound when you turn them on either....

The woofers were likely the problem in the first place. DO an ohmmeter check on them.

Note that the ohmmeter often doesn't work for testing piezo tweeters, but does work for the woofers with voice coils.
3helpful
1answer

Part # for tweeter in the Mackie MR8? I need 5

From a site:

Order new replacement tweeters from Mackie by contacting Mackie at: LOUD Technologies Inc.
  1. 16220 Wood-Red Rd NE

  2. Woodinville, WA 98072

  3. Phone (800) 258-6883

Ask for the tweeter for the MR5 & MR8 the part number might be 0030616. The price is about $31/tweeter

1helpful
1answer

Very loud ground hum when turned on

If nothing is pluged into the speaker and it makes that noise. It is not a ground problem. You either have a blown amp or remotely some bad connection at the large filter caps.
1helpful
1answer

What voltage and power from the transformer mackie mr8

This is just a hint as I was unable to find the schematic. Transformers VERY seldom fail, if you are getting anything out and the fuse is holding with no heating, the voltages are probably right.

Common voltaages seen after the rectifier and filter and regulators are +/- 15 volts and sometimes +5 volts. For the power amp they are usually between +/- 35 and 60 volts unregulated.

For small amps using the TDA2050 type amps, you will see aproximately +/- 24 volts DC unregulated.
1helpful
1answer

I have mackie mr8's my left one, when powered on makes a loud buzzing sound...i have disconnected power and pre amo...reconnected and it still happens...whats wrong?

Sounds like a ground loop. MAKE SURE ALL of your equipment is fed from the SAME receptacle. Make sure the ground pin on the power cable is good (try another cord or swap). Swap the audio cable to verify the cable has a good ground.
0helpful
1answer

Same here man...

These are Bi-Amped, that is have seperate amplifiers internal for the LF and HF.

First have to find if the amp or the actual speaker driver is bad.
6helpful
4answers

How do I replace the tweeters for the mackie mr8 is it from the rear or does the front pops off Thanks!

I built a web page on how to replace the tweeter on the MR8. Lots of good photos to help you with this problem. You can find it at: http://www.idahomojo.com/IdahoMojo/Mackie_MR8_Tweeter_Replacement.html Hope it works out for you!
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