At the end of a three hour gig at a nearby golf course open house, suddenly we get no sound from the speakers. Even the CD player has no sound. We had two vocal mikes, a keyboard and a bass plugged in at the time. We were not quite a full volume. The green power light is illuminated when power is switched on, but the red protect light does not flash when unit powered up and stays off. What has happened, an amp. problem?
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It is impedance that matters. You can connect 1000w speakers at 1 watt amplifier as long as impedance (Ohms) is correct. You can not frie speakers with low power. It is the same as turning volume down (even to zero?).If it worked for some time then problem is in mixer itself and would have happened anyway. Could be just blown fuse or something. Does it show any "sign of life" ? LEDs etc?
The first thing I recommend is to make sure that no mute buttons are pressed and no solo buttons are pressed. Explain a little more specifics about your setup and I can help you more. Sounds like some bad connections, bad cord, or something has blown. Lets stay simple starting out but, I need to know more about your setup, please. Don't forget to use phantom power for any condenser mics.I realize your problem is on the output side of things, just a couple of things to check before we start troubleshooting. Let me know.
I would check it with a different instrument cable AND bass guitar. If you end up with the same results, it's a thermal issue with the amp and will require factory authorized repair. The amp heats up and the intermittent component starts failing....more heat, more failure. It's not an easy fix and your Behringer repair shop will have their work cut out for them with this repair.
Try connecting them to another amplifier...you can use the speaker output of a guitar amp as a quick test. If the amp (and mixer) check OK, it sounds like you are about to become good friends with your local speaker reconing shop.
Remember...Distorted Audio Can Kill Speakers even at low volumes. It happens because sine waves become square waves. Google it for additional information.
The volume setting on the speakers has LITTLE to do with how hard you are driving them. Your source might be extra hot and overdriving them. Read the specs on the speakers and use a sound meter to check your level. The speakers, being only 12 inch, should fill a room 20 foot by 20 foot to about 95 to 100 Db which you are only allowed 2 hours in MAX to prevent hearing loss. At 6 hours you should keep it down to 85 Db SPL. I know several deaf musicians that were exposed to high sound levels in rock bands... a deaf musician is kind of washed up.
1000 Watts? Well, those are peak values. !000 watts RMS into a 12 inch speaker and it would smoke... this is some of our inflated advertising. But that is beside rhe point... now on to your problem: What you are having is a ground loop. You may have to do more than one thing to correct this here is the things to do in the order to do them to solve the problem:
1. Connect the piano and the speaker to the SAME power source or receptacle, even if you have to run an extension cord, three wire of course. Plug all of this ONLY into a grounded outlet, if your house has only two wire plugs, then you need to get an electrician to install a grounded receptacle.
2. Use Balanced lines. This means XLR or TRS balanced cables between the piano and the speaker. Use the 1/4 inch jacks output, not the RCA ones.
3. Since the AUX outputs do not support balanced lines, the next step require you use DI box. They are about $20 from Guitar Center and others. With very short 1/4 inch mono cable connect the piano to the DI box from the L/R mono piano to the high impedance input port of the DI and set the ground lift switch to "LIFT". Use an XLR to XLR cable from the DI box to the speaker. This last step if needed is the last thing in our bag of tricks to break the ground loop that can cause the buzz. Dirty power, if you have lamp dimmers can be a source of the noise.
The speakers are rated 250 Watts. Driving with 600 Watt amps requires one to be careful of how much the volume is turned up to avoid damage. You MAY have damaged more than just the compression drivers on the horns but the voice coils on the 15 inch speakers as well. Further use could also damage the amplifiers. You did not mention what brand amps and it is possible they have a problem.
You best replace the units with ones rated for the power of the amps as restoring them on short notice for a gig is not practical.