Yes sir, it happened once today. It was about a minute long. I did lose signal lamps on the amp but saw no other indicators that lead me anywhere. I usually am working the power point instead of the sound board but saw no other indicators that suggested anything.
Next time it happens, forget the lights, bells and whistles and put your hand on the amp. If it's hot, you're in thermal protect.All the info you've given and the signs point to thermal shut-down. Once you either confirm or rule this out then you can proceed further...if needed.I think you'll find the amp is going into protect as described in the manual on the pages I linked.
That was my thought pattern when it happened on the original main amp, RMX1850HD. That is also why I removed it from the system and sent it in for a physical. I moved the 1450 into service on the FOH circuit and now am getting the same scenario. This is why I am now exploring the DSP. I figure sooner or later and can remove/eliminate the culprit. I just hope I don't have to figure out how to eliminate the mixer. I am doing all of this without a connection roadmap and am creating one as I go. The mixer has many connections!
Bill...There are several common scenarios for amps over-heating.1. Lack of ventilation/cooling air, blocked exhaust.2. Dirt and dust in the amp interior.3. AC power issues, usually under-current.4. Shorting speaker cable, poor connection on the output side.5. Improper loading of the output. Possible causes include miscalculation of impedance matching due to amp run in bridge mode instead of stereo. Inadvertent bridging could also result in connection error with your speaker cables.The fact that the situation clears itself up after a muted interval points squarely to the thermal issue. Amp heats up, goes into protect (mutes), cools below protect threshold, etc. QSC repair may well find no fault in the amp if the protect feature is functioning for its intended purpose. This would indicate that something outside the amp itself is causing the overheating.There is very little chance that the system processor is at fault. Highest probabilities are as above: power and/or cabling, load/mode, connections...you get the idea.Good luck.
First would be bad wiring or some other issue along that order. I would split the output with a set of y cables, hook up the original amp to a test speaker with a short length of known good wire. If the output in the mains goes away and you still have sound at the test rig you have now eliminated DSP and mixer.The I would look in this order: 1 - Faulty speaker or wiring 2 - Issue with AC supply
So did the meters on the DSP unit still show full active signal level?
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