I recently purchased a Peavey XR 684 mixer. I've noticed that channels 1, 7 & 8 seem to come up loud & clear but the remaining channels have noticeably less gain and I have to boost them considerably. This mixer is about 4 years old. What am I missing?
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Re: powered mixer gain
Use good brand contact cleaner from radio shack or other electronics store and apply spray in the slider of defective channel and move each slider up and down many times.by the way check cabels which feed bad channel for a good condition and test these channel with the good cabel of good channel to confirm that the trouble in channel itself.after all if it is hopeless pass the mixer to service center to fix it.
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PUT OUT PUT EQUALISER IN INPUT RETURN PUT IN PUT EQUALISER TO OUTPUT MIXER
OR JUST PUT EQUALISER BETWEEN MIXER AND AMPLIFIER MEAN OUT PUT EQALISER TO IN PUT AMPLIFIER AND INPUT OF MIXER TO OUT PUT OF MIXER
The first thing to do is check or more likely replace the power output devices (located on the massive heat sink) on the faulty channel. Then look around for burnt and damaged parts. You might need to replace bias resistors on that faulty channel, which are connected with the output devices. If it powers up as it stands the power supply section should be OK.
Buzz through speakers usually means it is picking up humm from a power source. Check your mixer and amp input (gain) levels. If one is turned up really high you will get buzz. If that doesn't work check where it is plugged in. Is it sharing power with another electronic piece of equipment? You can also buy a power conditioner (I believe it is called). It will put out "clean" power (power without Hz humm). They can be expensive though. Less exspensive mixers will put out humm. Lower that gain as low as possible and raise the amp gain. Or vice verse
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.
you need to clean the line out jacks and the effects jacks and all the master jacks with a freon based cleanef that is safe for plastics... Ues a 1/4 inch cable plug in and out repeatedly while the power is off..
There is an intermittan crossion of the switching jacks in the master secrion...
First of all the EXA-3940 is rated at 350watts per channel in to 8 ohms. The 1400 watts is bridged into a 4 ohm load. Second, the speakers can handle 1000Wats peak with an average of 600 continuous (i'm guessing). That tells me that the amp is underpowered for the speakers. The sensitivity of the amp is such that the mixer is overdriving the input stage. That is what is causing the clipping. If you are looking for more volume, you are probably better off purchasing another amp and running them in bridge mode, 1 per speaker cab. Be careful though, not to overdrive the speaker cabinets either.