Question about Yamaha HTR-5990 Receiver

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Sony strdg720 problem

I have a sony strdg720 that i just got bout 3 weeks ago brand new. problem is i get a high pitched whine from all 7 speakers regardless of the volume. i trouble shot it in any possible way.even took it upstairs to a diffent plug and it still does that. anyone got a solution or the same problem? its not very loud but loud enough to be annoying at night.

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  • ghostridercj Feb 19, 2009

    its the second one. the first one did the same thing and i took it back and got replaced with this one. the pitched whine is loudest when i select the multichannel soundfield. i called sony n they sed its EMI, but ive even tried it by itslef on a seperate plug. tried what u sed but its still there, just lower.

  • ghostridercj Feb 19, 2009

    no open computers in the area. its not the ground buzz for sure..that faraday cage sounds like a cool idea, but im thinking its the actual amp thats the culprit. ive tried the receiver by itself on a lone plug in a different room but the same result. i dont have a frame at the moment but if it persists i'll just call sony,my strdg710 upstairs is extremely quiet when idling.


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Try turning off any surround mode so all you have working is the 2 front speakers. If the soundgoes away, the problem is in the digital surround processing and you are hearing the results of digital noise. Since this unit is new, return it for an exchange indicating the problem. It should not be making this sound.


Posted on Feb 18, 2009

  • ABRsvcs Feb 19, 2009

    The EMI excuse sound a bit suspect to me. What else is in the area? Any opened computer systems? If the sound still happens with the surround in bypass, then there is no digital processing involved. Make sure that the ground is good on the outlet you are using. A good ground will help.

    One other thing you can try is to make your own Faraday cage. Make a small frame that is large enough to go around the entire unit. Cover the frame completely with aluminum foil with no gaps other than the front so you can get at the panel of the unit. Ground the foil to the screw of the outlet. This will create an interference free zone. If you still get the noise, tell Sony they have a problem with the unit and request a fix. This will prevent any EMI from affecting the unit.

    Let me know what happens.



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