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What probably happened is that somebody changed (or replaced) a volume control (commonly called a pot, short for "potentiometer," but got the two outside terminals swapped, as to how the wires attached. No big deal ... just swap the wires (WITH NO POWER ON, and no connection to any power sources or other equipment)!
You are somehow feeding back. Maybe the effects are on with an echo setting. First thing: Make sure ALL interconnected equipment are powered from the same receptacle or source. This includes amps and speakers and any other devices that are powered. Make sure ALL interconnects use BALANCED interconnect cables either TRS or XLR type. First thing is to eliminate ground loops by the above proceedure. Note the pros run power back alongside their snake from teh stage. Using multiple outlets in a building to power equipment puts equipment at risk and picks up noise due to ground bounce.
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.
The volume control must be have dirt in it. When you move it do you hear rustling noise. A quick spray of WD40 spray into the control will solve the problem.
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.
This amplifier has a VERY complex output section with a bunch of parallel transistors and several of those may have failed resulting in low output. Two other things can happen: Use of small gauge speaker cables eats up the available power. Changing or using damaged speakers can draastically change perceived sound levels. Checking the output waveform amplitude and voltage under load is with an oscilloscope the only way to diagnose this problem.
Generally speaking you should only send low frequencies to subs. The highs, while lower in power than the lows, will over time harm the voice coils. The ideal way to do this is to use an external crossover netween the main output and the amp input with the higher range going to a general set of speakers. Send the lows through the second channel of the amp and then to the subs.
In short, while not recommended, yes you can hook them up in parallel.
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