Question about Mackie MR8 Pair of 8 inch 2-way Mackie Reference Monitor

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Service manual mackie mr8 - Mackie MR8 Pair of 8 inch 2-way Mackie Reference Monitor

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Posted on Jan 02, 2017

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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.

Posted on Sep 22, 2009

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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!

Posted on Dec 20, 2009

  • 5603 Answers

SOURCE: What voltage and power from the transformer mackie

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.

Posted on Jul 20, 2010

  • 5603 Answers

SOURCE: 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

Posted on Dec 22, 2010

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1 Answer

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.

Oct 24, 2012 | Mackie Mr8 Active 8" Powered Studio...

1 Answer

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.

Feb 05, 2011 | Mackie MR8 150W 8 Active Two-Way Studio...

1 Answer

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

Dec 22, 2010 | Mackie MR8 150W 8 Active Two-Way Studio...

1 Answer

MR8 has a very nasty ground hum immediately when powered up. Where do I start looking for the cause/solution to this problem


What cables are you using? I have found brand new XLR cables that were mis-wired causing hum.
Check that the signal wires connect to pins 2 and 3 in the connectorss and that the shield is tied to pin 1.

Find images of the pin positions here:

http://www.google.com/images?hl=en&expIds=17259,27740,27760,27796,27824,27867&sugexp=leprodsca4&xhr=t&q=xlr+pins&cp=7&wrapid=tljp1291152977062014&um=1&ie=UTF-8&source=univ&ei=V271TMPdLoj2tgOK2PG7Cw&sa=X&oi=image_result_group&ct=title&resnum=3&sqi=2&ved=0CDgQsAQwAg&biw=1233&bih=570

Make sure the speakers are powered from the SAME receptacle as your mixer !!!!!

If you are using 1/4 inch connections they MUST be TRS type using BALANCED lines to avoid hum.

Nov 30, 2010 | Mackie MR8 150W 8 Active Two-Way Studio...

1 Answer

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.

Nov 30, 2010 | Mackie MR8 150W 8 Active Two-Way Studio...

1 Answer

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.

Jul 20, 2010 | Mackie MR8 150W 8 Active Two-Way Studio...

1 Answer

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.

Sep 19, 2009 | Mackie MR8 150W 8 Active Two-Way Studio...

1 Answer

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.

Aug 19, 2009 | Mackie MR8 150W 8 Active Two-Way Studio...

4 Answers

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!

May 18, 2009 | Mackie MR8 150W 8 Active Two-Way Studio...

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