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It sounds as if the input is too low. what happens if you plug whatever is going into the stereo channels into a pair of mono channels. Or are you taking about the phono stereo tape input?
The stereo channels are line level whereas the other channels have both line and mic level inputs, what are you trying to put through the stereo channels? You must make sure the gain switch is set to the -10dB to get the most sensitivity (the mono channels have about -132dB max sensitivity BTW) You probably need a different mixer or possibly a submixer if you are needing more than 4 low level inputs.
What you've done should have worked on the video input. The phono will not sound like you'd want. Have you made sure the mixer is working correctly by trying it plugged into a different amp using the same outputs and cable?
I think that rather than the mixer, that your front speakers may have a limiter built into the high frequncey amp. You may be asking them to do more that they are capable of.
You DON'T connect speakers to this... this is NOT a powered mixer... you MUST use external amplifier !!!! You use bvalanced (TRS) cables to a suitable power amplifier which connects to speakers. Some Behringer mixers such as the PMP5000 have built in amplifiers to drive speakers... yours does not.
OK... from the schematics it appears that when in mon1/mono mode you use ONLY the MON1 gain controls, including the channel MON1's and the MON1 slider. Make sure you have each of those turned up as needed. In this mode, MON2,s and the MON2 slider are unused. The MONO slider controls the MAIN output.
Please note that the outputs of the MAIN L/R line outs are TRS balanced. If you plug mono plugs into these or connect to mono device you MAY have a problem of grounding out half of the drive internally. ALSO please read my tip on here regarding a polarity hazard of speaker cables of PMP amps if you do NOT have Speakon to Speakon cables, but have Speakon to 1/4 inch cables.
Likely one of the power amps in this has failed If no lights come on the unit now, then the power supply is wiped out as well. It takes about $50 worth of parts and quite a bit of skill and work to restore the unit, including carving out burned board and re-insulating. Likely a feedback occured on that mic and started the whole thing. Supersonic feedback is something most musicians are NOT aware of, but if the feedback is above the range of hearing, the amps can be strained as they may go to maximum power trying to amplify the sound you can;;t even hear. Piezo tweeters are capable of frequencies up to 30KHz.
If this is under warranty exercise it immediately.
The speakers are 8 ohm so you can probably get near the 400 Watt per side when connected to this mixer. You don't need bridge mode to get this and I would recommend not using it anyway. Whatever you do make sure the speakers don't get disconnected when running at high volumes as you will arc out the amp in the mixer... I know this as I fix them... I have two PMP5000's that I repaired. Lots of work to repair...
The feedback is NOT the fault of the mixer or speakers but instead of something picking up sound from the speakers and sending back to the mixer.
The mic must be well in back of the speakers (say at least 10 feet) to avoid this or you need to use anti-feedback hardware to avoid the problem or highly directional close talking mics. Reverberation off walls can also get back to mics and cause problem. I was able to use a wireless Peavey mic which seemed to disrupt the phase enough to never get into an oscillation even when in front of the speakers.
Check you assign buttons and bottom (three black square buttons) and play with them. It sounds as if you are not sending to that side. You should use mono cables into left and right. I set pan on left all the way left and right, all the way right. Hope this helps.
@ elitepknu: so how do i fix that problem
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