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Question edited for clarity, full 'make model (what it is)'.
Question moved to make / model category.
It sounds like a power board or overheating issue. Find your local Peavey agent and take it in for repair. If you want to try something, open it up and look for a cooling fan and fluffed up vents.
Despite the mixer's namebrand i can say that should be a low voltage supply issue, mixers have normally just 3 voltages, and the ones with effects 4, the critical voltages that mantain a mixing board working are just 2, +15V and -15V and you can check for them at Pin4 for -15V and pin8 for +15v of operational ic's at any channel with the mixer on, one of those are not present and this is you issue for sure, certain mixers have fuses for this two voltages but since you are not posting the namebrand i can't figure it out, if one voltage is missing could be the fuse or the power regulator that reads"MC7825" or "MC7915" which 7815 is for the positive rail and 7915 for the negative one, both are located in the power supply board, let me know more to help you more.
I'd need to know what mixer you have, to know if there is a [line out] connection socket and an [internal amp in] connection socket.
"each with own poweramp" I presume means the ep1500's and NOT that the speakers are active (ie containing amps)
***If any of your speakers are active, ask the question again, with more detail.***
So if all your speakers are passive, I offer the following.
I assume there is [effect send] and [effect return] on the mixer
effect send>quadraverb>effect return
mixer line out > eq > compressor > sonic maximizer > crossover
sub output of crossover> amp > sub
high output of crossover to mixer's internal amp input
mixer's speaker output > main speakers
monitor output > other side of eq (>other side of compressor if desired, but use sparingly ) > other side of sonic max if it is true stereo , otherwise skip > amp > monitors
If your mixer doesn't have an input to its internal amp, we are "back to the drawing board"
With questions like this it pays to give as much detail as possible; model and make of each component etc
I have done my best with the the info you have provided.
Don't feed amp outputs into powered speakers
Make sure that you have enable the main monitor volume at the end of the mixer. They are labeled AUX1 and AUX2 as well located under the last channel of the mixer. If those are on 0 your monitors won't work
If the mixer is receiving signal, then the problem is pilot error at the mixer, not the guitar. You did not mention what type of mixer you have so I have no way of helping. Common problems would be failure to send the guitar channel to the mixing buss, leaving the channel muted... but we really need the mixer and model number to give more help that that.
The board is a mixer only, not an amplifier. A mixer simply, well, mixes audio sources into a line output which then goes to the amplifier.
Your question really has no answer since wattage is determined by the amplifier used. Essentially, it can "push" as many watts as the amplifier can deliver.
You don't specify which model Phonic mixer in question.
Is it a powered mixer ? And are you plugging your speakers into the speaker outputs ? If it's not a powered mixer and you're plugging speakers into the Line Outputs, you're not using a power amplifier between the line outputs and your speakers - this won't work.
If it is a powered mixer and you are plugging speakers into the speaker output connectors and still getting little or no sound, check your speaker cables and the speakers themselves by plugging them into known good amps.
Most likely the fuse for the effects circuit has blown, which happens sometimes on mixers with built in effects.
You'll have to open the mixer as the fuse will be inside the mixer on a circuit board (look around inside where the effects part of the mixer is) replace it with an identically rated working fuse and you should be done.
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