Not enough information provided - problem is likely impedance / load related. Receivers / amplifiers usually self-protect when the resistance they expect to see as provided by a loudspeaker is too low, or bypassed by a shorted circuit. Check your loudspeakers' impedances - impedance is measured in ohms. The loudspeakers' native impedances, as-built, may be too low for the amp. You can check the amp's requirements in the spec's section in the manual. If the numbers check-out, then put a multimeter on each loudspeaker to check their impedance. A failed loudspeaker can have a tanked impedance, thereby cascading instability to the amp. If you are driving a dynamic arrangement of loudspeakers with room-borne volume controls, a multi-meter won't likely reveal accurate impedance, you will need an Impedometer to test. And, most importantly, make absolutely certain that there is not a single strand of conductor errantly shorting at all terminations.
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Protect will usually show up if the receiver was turned up too loud to the point where the speakers will crackle, the receiver will switch to protect to not damage anything. Unplug it for about 30 seconds and check all the audio wiring in the back to make sure everything is plugged in good and tight and no loose cables or stray pieces of copper audio wire and plug it back in.
The receiver has an output load problem, turn the unit off, remove the speakers and wires, now! turn it back on and reduce the volume right down, if the word protect stays off you have a short in the wires or one of the speakers. However! if the word protect comes back on "with the wires and speakers dis-connected" there is a short in one or more of the audio output ic's in the receiver, this will require a technician to troubleshoot the extent of damage and cost involved.
Problem is in the amplifier output stage...there is probably a shorted component...the short could have come from a bad speaker..or the speaker wires getting touched together while it was on...you could return to store if it is new and get a new one...maybe it was a return and accidentally got put back into stock
I discovered that there is a compatiblilty problem between the Bose receiver and the Sony amplifier. If I disconnect the receiver from the amp then the amp starts up normally. Apparently the receiver sends out a dc offset or a "thump" that the amplifier doesn't like and goes into protection mode. I solved the problem by putting a 1 second delay circuit between the receiver startup and the amplifier startup. A simple RC delay on the remote input to the amplifier solved the problem.
Mine did same thing-when I put on my strongest reading glasses,I discovered ONE STRAND! of speaker cable was touching (-) speaker output terminal....felt like a fool....Worth taking a second look! [email protected]