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The easiest thing to do is add an outboard crossover; something like a Rane AC 22S. Set the mode for stereo 2-way & mono sub out. L & R mains out from the mixer to the crossover, mono sub out to the sub and high out's to the full-range speakers.
The compressor is a really good idea and should be connected between your mixer and your amplifiers. Your "integrated" mixer/amp is a bit tricky in that you will have to "insert" the compressor in the signal path.
If you have the "console" model....
1. "Main 1 Out" left and right to the input of your compressor and the output of the compressor connected to the "PWR Amp Insert."
2. What is known as Tip, Ring, Sleeve patch cable and plug connected ONLY to the "PWR Amp Insert." This type connection breaks out into a "Input" and "Output" using a single 1/4 stereo plug.
If you have the "square box with knobs on front" model
1. "Main Output" to input of comressor and compressor outputs to "Input to Main" (aka "AUX IN").
Check your owners manual for hookup details or suggestions and remember, all outputs feed inputs and all inputs feed outputs.
you can just piggyback the mixers - take the outputs from the mackie mixer (assuming it is NOT a powered mixer) ... those should be line level outputs - send them into a line level input on the digi 002 and then set that channel on the digi 002 and once set, just leave it, and control the mackie channels individually ... should work fine ...
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Line outs Left and Right from mixer to power amp Left and Right inputs, Power amp outs to Subs(if they have passive crossovers built in check specs on subs). From Subs then to Main spkrs. Make sure power amp is set in stereo mode using this way.
Alternative: You will need at least a 2-way stereo crossover unit inline after mixer and before power amps if the subs don't have a built in passive crossover. Most of them do have passive crossovers in the subs these days. Then separate amps or one channel would drive the subs and the other the main speakers. True stereo would require at least a 2 way crossover and two stereo power amps if hooking them up this way.
There is another option as is common with many sub setups. Send the signal to the mains using L/R outputs from mixer and a separate Mono output to the subs only. Putting only bass/kick and low frequency outputs in this send would help too.
I'm not quite sure of how the two amps are interacting here, so I'd like to request that you describe the entire hookup. Sending a higher signal from the mixer should not be a problem, but something is wrong in the setup (I think).
Please update this with a description of how you have the mixer and amps connected to the speakers.
Red - Power (to ACC in vehicle)
Black - Ground
Yellow - 12V positive (battery lead)
Blue/White - External Amplifier Control Lead
White - Left Front Spkr +
White/Black - Left Front Spkr -
Gray - Right Front Spkr +
Gray/Black - Right Front Spkr -
Green - Left Rear Spkr +
Green/Black - Left Rear Spkr -
Violet - Right Rear Spkr +
Violet/Black - Right Rear Spkr -
The red and white RCA pigtail leads is for AUX input
Left set of Preamp Outputs - Rear Channels
Right set of Preamp Outputs - Front Channels
Only Models C3433U, C3304U, and C3333U have a 2nd set of RCA pigtail leads for subwoofer output.
The Peavey A/B controls are output gain controls. Your mixers stereo output goes into the amps inputs, channels A & B. The Peavey is the output stage to your speaker system. If you you connect the outputs from a power amp to the inputs of a mixer you will blow the mixers input stage, amongst many other things and possibly damage the amplifier too. The bias (Bass, Mid, Treble controls) are on the mixer, not the amplifier. Unless you are using a mixer amp, which you are not. A PA system DOES NOT work in the same way as an intergrated hi fi amp.
You can hook up the speaker "between" left and right outputs. Just connect the center speaker between left +ve and right +ve outputs respectively. It will give a spacial effect that some like and some dont:) Try it and see for yourself. Your marantz amp will handle the load OK. It is rated 38 watts into 8 ohms, but there is not alot of load presented by this sort of setup. Let me know what you think.