I used my monitors at high volume for approximately 1 hour and they stopped working. One monitor has no volume and the other has very low minimum volume.

simple !! most peavey mixers have a monitor output !! you can use that to feed new amp , and theres your volume too !!! or if your already using the monitor output , you can buy a split cable (1 in 2 outs) for main send !! this cable would have to be kept short or it will induce HUMMM !! and in real extreme cases if your using a low Z send (cant think as to why ) a device known as a (direct box) normally used by instrument sends can be used in reverse to "tap" into a low Z send and output with a unbalanced send for an amp to your other room , but hey why not just add a speaker with a volume control to it for this smaller room ? and forgo the new amp

You have two monitor outputs, each controlled by a fader. Plug the amp(s) you will be using to power the monitors into these, connect the monitor speakers to the amp(s) and you're set up and ready

1. Turn the main and monitor volumes all the way down (off). Plug a cd player into channel 9/10 and play a track of music of your liking. With the main/monitor volumes still off, adjust the gain on 9/10 until the clip light turns on, then back it down until the clip light just turns off. Put the channel volume at 12 o' clock.
2. With the music still playing, turn up the mains to the desired listening level first, and then adjust the graphic eq until the music sounds good in the room. Remember or mark the position of the volume control. Do not use the channel eq on 9/10 for music that has been mastered properly, leave the eq flat. Once this step is completed then you have now set the main eq.
3. Repeat the same for monitors. Turn off the main volume and then bring up the monitor main volume to the desired level first, then set eq. Now your monitor eq is set properly. Remember or mark the position of the monitor volume.
4. Set up microphone - plug a mic into channel 1 with volume all the way down. Speak or sing into the microphone and adjust the GAIN until you see the clip light, then back down a litttle on the gain. Put the monitor and main volumes back up to the mark from step 2. Now adjust the volume and monitor send on the mic channel to the desired loudness first before adjusting the mic channel eq. Use subtractive eq method to minimize distortion and feedback. ...i.e. if the mic is bassy then turn down the lows, do not ADD highs. If the mic needs bass, turn down the highs.

1st....the output section, "M" stands for mono. The A&E does not have "monitor" sends per say but instead calls them "Aux's." Adjust the proper Aux for the input channel 1-16 and use the Aux output section (row of knobs above output sliders) as the master volume. By using Aux 1-4 (and with more amps) you could send 4 discrete monitor mixes to four different band members. Bass likes his monitor strong but doesn't want to hear other members while guitarists want to hear only himself and the singing drummer...etc.

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.

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.

The setting of the volume controls bears LITTLE importance to the actual level the unit is being run at since one can send high levels INTO the units from the source. These are intended to be used in a studio for the audio engineer to listen to in a small room. They should really be no louder than a consumer BoomBox maximum.

A squeaking noise is not normal at a level such as mentioned however. You might see if the noise is from the speaker itself or possibly parts of the cabinet... Plastic parts are NOTED for squeeking and can be suitably lubricated.

Beyond that, since the units are new, you should be able to exercise your warranty.

Please read my tip on fixya regarding a HAZARD of PMP mixers when using Speakon to 1/4 inch speaker cables. Essentially, the barrel of the 1/4 inch on A channel is the "hot" and one had better never let it touch a grounded point.

Now to your problem...You may have to run the MAIN sliders near the unity setting (zero Db).

It is important to set the trims correctely. For each of the inout channels, push the PFL button for the channel down and set the trim control so LED display is just below the clipping point at maximum input for the channel.

Ideally you would like the channel sliders to be in the vicinity of unity gain when system is balanced. Running the sliders way down results in a poor signal to noise ratio. Next you adjust the channel monitor knobs to set the monitor mix. These should be about 12 o'clock if possible to get decent signal to noise ratio.

For the MON/Mon1 mode, do NOT use the "Surround" simulator OR the "Speaker processor" ... make sure those swithces are off. You will probably want to PAN the channels fully to the MAIN side "B" which MAY be the reason your level seems low.

Remember the individual channels are about 400 Watts and 600 peak. Frankly myself I prefer to use both MAIN channels to the main speakers and use an external amp for the monitors OR use powered monitors for monitor use.

You haven't mentioned what model and manufacturer the mixer is. I will have to guess and say that the monitor out on the board isn't providing signal to the powered monitor or the monitor out on your board is powered and is now damaged by plugging a powered monitor into it. Carefully reread your manual and determine if the monitor out on your mixer is powered or line level. Reread also and make sure that the signal you are monitoring is assigned to monitor out, levelled correctly etc. If you find that the monitor out is passive (line level) try hooking it up to an external power amp and speaker. A guitar amp will do for testing purposes. Start with a low input volume on the amp. Also make sure that if it is passive to use a shielded cable from monitor out to input. If your board has powered monitor outs you can use a speaker cable from monitor out to speaker input (non powered monitor speaker).

I have a Korg C-15s and also experiencing loud crackling sounds when I turn it on. The problems seems to be either the sliding volume control or the amplifier itself. Honestly though, I believe the issue is the volume control. I opened my piano to get a closer look and attempted to clean the contacts on the volume. Unfortunately after cleaning the contacts, the crackling sounds became somewhat worse. After I turn the piano on, the volume control is generally rendered useless......volume set to low volume and the noise is quite loud and other times the volume control is set high and get very low volume crackling noise. No real consistency. The noise does diminish after a few minutes but so does the piano sounds to an inaudible level. There were a couple of instances where I turned it on and surprising enough, no no noise and perfect sound. For these reasons I believe the issue is within the volume control and not so much the amplifier. I have an electronics background and noticed that the volume control is very unique in design and is not something that can be substituted with another volume control from other sources.

My recommendation is to check the sound quality of the audio from the RCA L/R audio outs on rear of the piano by connecting to a stereo receiver. If it sounds fine you're in luck. If the crackling sound does not diminish after a few minutes like mine does, I would suggest disconnecting the internal speakers and using the audio out only. You can connect a pair of studio monitors or high quality computer speakers, preferably with a small subwoofer to deliver the full audio range and deeper tone of a real piano. I'm currently using a basic pair of Logitech computer speakers and is quite acceptable until I can afford a high quality set of monitors or relocate my piano closer to my high quality Yamaha receiver.

I hope this info helps a bit.