Question about Sony STR-DE575 Receiver

2 Answers

Unit going into protection mode

Hi, I just joined, and the story of my problem seems similar to a few others I've just read here. I've had my Sony DE575 for about 4 years now with absolutely no problems. However, it's not a constant, but very often lately, while playing from any one of several different sources (CD, DVD, TV) once a certain volume level is reached the unit goes into "protection" mode and shuts itself down. Due to a change in address I recently had to move & re-connect the unit for the first time, but everything seems to be connected properly & the speakers seem to be in phase. Previously the unit had 2 acoustic research and 2 Bose bookshelf speakers. Now the speakers are 4 Bose bookshelves, with a Optimus center channel speaker. There is no subwoofer. I tried lowering the bass response levels on the EQ, thinking perhaps the it was driving it too hard, but it didnt make a difference. The volume level at which the unit shuts down seems to vary, but I used to be able to have the volume at basically any level and the unit has never previously had this problem. And there's nothing in the manual at all about the "protect" warning that appears. Any ideas, advice anybody could give would be great! Please let me know if you need any additional information. Thanks! Bill Cairns

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  • BigRun Dec 26, 2007

    My system with the same AV receiver will go to "protect mode" only after generating a loud noise. I have double and triple checked all the speaker connections, routed all power cords away from speaker wires and yet the "feedback noise" continues intermittenly then into the protect mode. This problem did not start until we moved last February. The problem occurs in all audio selections (DVD, CD, TV) and volume levels. The only difference in the current layout versus the previous equipemnt layout is now the powered subwoofer is between the left front speaker and the TV?Equipment stand. My next move is to by pass the sub-woofer.

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With the shuting off of the player if u have any type of feed back from wireing or elect proble it will shut off

Posted on Dec 25, 2007

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You should first have or check the impedance and resistance of the speakers. then if all the speakers and wiring checks good, the only way to tell if this unit is good or the output section has no problems, is to hook up load resistors to where the speakers go, insert 400 to 1000 hz @.775MV into an input, hook up an osilliscope to the load resistors and slowly turn up the volume and see if the waveform clips before it shuts down. I doubt if you will have the equipment to preform these test but a good repair shop will be able to help you out. If it does not clip or go out then its all speaker wiring and/or the speakers.

Posted on Oct 04, 2006

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6ya6ya

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Hi there,
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Posted on Jan 02, 2017

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