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I have made that same misfortune a while ago with a ONKYO bookshelf stereo from japan that I plugged in without setting the voltage properly, and on it, the damage was so extensive inside that it was cheaper to replace it, rather than go through having every single resistor and capacitor replaced.
Almost always, this is a FATAL condition, unless you are willing to sink lots of money into the repairs.
I would probably just get a new stereo, and be done with it.
A good, high powered stereo receiver, with all the modern features only runs around $250-$400 dollars, and depending on where you go, it can be even cheaper than that.
I hope this let's you know what the options are, and good luck to you.
This is a self-protection mode protecting the receiver from low impedence / High Current on the speaker side. Given that this is an exercise stereo and it may be turned up I would recommend purchasing a second amplifier to run the second set of speakers. Obviously I would recommend one that you would be able to add and remove before and after the class.
You need to measure across the speakers themselves n ot the crossover (cap). If these are 8 ohm speakers, an ohm meter will read about 6 or so. That is because both impedence and resistance use the same measurement. With an ohm meter you are measuring resistance. The speakers are rated using impedence.
If both speakers are open (measure infinity), I would suspect a problem with the stereo that caused them to go open. With the stereo on and playing something (radio,cd , or whatever) use a DC voltmeter to measure between the speaker terminals (Red/Black). You should read essentially 0 no matter what the volume. If you read any DC more than 3/4 V, the problem is with the amp section of the stereo.
I would suspect that the radio is not installed correctly. There should be 12V present on one wire for retaining memory. There is a capacitor inside the radio that will retain memory for a short time (less than 5 minutes), but you should not have to reset the system after each start. If the wiring is correct, then the internal memory system may be defective and require replacement.
It sounds like You have a Bad output Some where and its going in to protect mode disconnect spkrs and make sure volume is Down all the way and power up,Ck your wireing for Freyed wires and shorts at the inputs and outputs
good Luck ttech
If the surround back is turned on,on the receiver,then the 7CH stereo will activate
the 2 rear,but if it's off on the receiver
the 5CH on the remote will do the same.
I don't know much about the unit changing from 7CH to game,rock Arena etc.that i know will happen if u press the DSP simulation found
@ the 3rd. top right button on the remote.