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Sounds like a problem with the horn amp in that cabinet. This is not a user fixable problem and needs to go to the shop. Here is a link to the Mackie support page where you can find a link to the repair shop list. Mackie Tech Support
mistakes happen everywhere, there are some models that come with a factory fault, just because its a human who designed it. but good thing when the notice the problem its quickly sorted out, and mostly they replace the model with another one.
Well this is a common issue with this mackie design, the 90% of this report comes out of a cracked output Mosfet's pins or Coil at output section, let me know further to help more.
Have you checked fuses? You may have overloaded the amp and caused a fault internally. I have experienced power supply faults with Mackie products, but it may be a simple fix. Find a local repairer to have a look at it.
Some sort of feedback. Try grounding the input or connecting a source that is silent. If it still does it, time for the repair shop. This may be close to the schematic:
Scroll down to the link "Get Manual" and click to download a compressed file with two parts. One is the electronic crossover, the other is the power amp.
There is a mute control if signal is not present and also a gain limiter. This may take some troubleshooting by an experienced electronic tech. I would look for something wrong in these two parts of the circuit.
You can, but I would not suggest it. Depending upon the input design of the powered sub, the highs might not get filtered out. Many subs assume that they are only receiving the lows. You are better off using a crossover between the mixer and the amp for highs and the powered sub for the lows. Please note that the crossover will give you much more control over the sound quality.
Run your speakers cables to your stereo "outs" (L/R) then run your sub off of one of your aux "outs" or sub group "outs" (make sure you assign channels to sub group out).
The best way is to use a two-way crossover between the mixer and the amplifiers. In your case, the low output from teh crossover would go to the powered subs, the highs to the QSC. Use the crossover adjustment to set the frequency crossover point to get the sound quality you require.
There are more than one fuse and they are internal. Replacing the fuse without fixing the cause MAY result in causing more damage to components. The fuse is inside to force one to open the box to repair.
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