RMS PM 10400s not turning on suddenly

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?

Sherman, you are answering a question from 2014! Everything on Fixya is FREE.

https://www.google.com/search?q=Schematic+for+rms+pm8200r+8+channel+mixer

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Almost any amplifier will work so there is no "best"... Just make sure the amp RMS rating is a bit below the RMS rating of the speaker for safety of the speaker. A QSC GX5 would be a candidate. You would use one side of it for each speaker if you have two, or use only one side for a single speaker. A lot of pro's seem to use these amps. USE BALANCED interconnections either XLR or TRS cables AND for sure power the amp and the mixer from the same receptacle... it often means running an extension cord like the pro's do to avoid ground bounce noise AND damage to the equipment.

If you read the TRUE specs on this speaker it is really a 200 Watt RMS unit. Make sure you are using balanced lines to the speaker XLR or TRS cables. The mixer should NOT be a passive mixer as these do NOT generate true balanced lines. Make sure the mic can't "hear" the speaker or you may be getting supersonic feedback that is above your hearing range that saturates the amp. If *********** can't stand to be ain a 15 foot square room with teh level you are generating, it is TOO loud for this unit to handle.

The 600 watt rating is FAKE like most of our advertising and will be either 600 watts PEAK or 600 watts PROGRAM. If it is Peak, use an amplifier with no more than 100 watts a side RMS... If it is program rating use an amp with no more than 150 watts a side RMS but that is pushing it for speaker safety. Also pay attention to the spec of the amp as to what it will output at the impedance of the speakers. I read the spec on the speakers... they are rated 150 watts RMS, NOT 600 watts... Use an amp rated at 150 watts RMS MAXIMUM at 4 ohms per side. Also don't turn up the bass excessively or you be buying new speakers. Twelve inch speakers would be adequate for a 20 by 20 room at SAFE listening levels. If you want driving bass, you need to get an 18 inch subwoofer.

Well... you probably won't like this, but here is some info: In bridged mode, a different Speakon to speaker cable is required from only the B... it is wired differently and you can only use one of the plugs. The speaker or speaker system CANNOT be less than 8 ohms in bridged mode... this precludes using speakers in parallel or multiple speakers that are less than 16 ohm impedance... such speakers are NOT commonly available as most are either 4 or 8 ohm. There is a slide switch for bridged mode on the face of the mixer. Next thing you won't like... The 1200 Watts specification is PEAK power, NOT RMS... You can get 400 watts RMS per side USING 4 ohm speakers. If you use 8 ohm speakers, each of those will get 200 watts. I use this mixer myself and ALSO repair them. The voltage swing at the outputs is about +/-60 volts MAX (peak). This is about 40 volts RMS by the time the circuit LOSSES are taken into account. Across a 4 ohm speaker you get 10 amps times the 40 volts or 400 watts. Across an 8 ohm you get 5 amps or 200 watts. The voltage rails in the switching amp are +/-70 volts DC so these are reasonable values. Bridged mode just uses both sides of the amp driven in opposite directions for higher voltage out BUT you have to use no less than a single 8 ohm speaker so there is NO advantage to bridged mode power wise. IF YOU NEED more power, use extra speakers from an additonal amp driven by the 1/4 TRS mains output jacks OR use additonal POWERED speakers driven from the same jacks. Please read my tip about the hazard regarding the SLEEVE of the cahnnel A cable when using Speakon to 1/4 plug cables being the HOT and the tip being the cold for channel A. Ground the sleeve accidentally and goodbye channel A amp...

Proper level setting of the mixer is important. HOWEVER if the clipping is occuring at the speakers the only possible problem MIGHT be that you have a supersonic feedback that is saturating the speakers above your hearing range, Be sure you don't boost the highs too much with the EQ as this can cause the feedback that you can't hear. Also make sure that you power the speakers from the SAME receptacle as the mixer, even if it means running an extension cord to bring power to the mixer. This is to avoid a low frequency hum and common mode distortion/damage. A low frequency hum could cause the clipping.
It would be a good idea to get a sound meter to check the sound level. You should be able to reach 85 Db from this system without clipping. If you need more than that, you MAY need more speakers if the band instruments are too loud. Also if the band has amps that get into the vocal microphones that adds to the clipping level... make sure the mics don't "hear" the band instruments. Make sure your speakers are toward the audience from the mics to avoid the supersonic feedback problem. If the vocalists can't hear themselves with that configuration you need to set up seperate stage monitors.

There are some pretty good videos on YouTube about proper mixer level setup.

UPS will not help this. Make sure you are using GOOD quality balanced cables, preferably XLR to connect to powered speakers. Make sure ALL (read that "ALL" closely) of your equipment is powered from the SAME receptacle or power module... this means run power to your mixer or speakers alongside your audio lines or snake between the units. This includes ANY other devices tied into your mixer with the exception of truly ground lifted DI's.

Good way to pop speakers is to run them on stage power and mixer from plug at the rear of a room... The common mode ground noise will exceed the common mode capability of the audio inputs and fry them.

The answer to your question is NO, there is NOT an internal adjustment.

For many mics the trim is used full clockwise. Some higher output mics I use the trims are run at 3 o'clock which is mostly turned up. This is NORMAL for most mixers. If you don't have enough mic gain relative to other inputs, the fault is balancing the other inputs down and using higher setting on your MAIN slider.

If you use 8 ohm speakers then you can expect to get about 200 Watts of audio per side with this amp. You can get about 400 Watts RMS (600 Watts peak) using 4 ohm speakers.

The efficiency of the speakers makes a lot of difference in the sound level output/

The unit should drive 400 Watts RMS into a 4 ohm load per side.

The amount of sound power you get will VASTLY depend on speaker efficiency. You would likely use at least 15 inch speakers with the unit.