Question about Yamaha DSPE390 Amplifier

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When I play surround sound movies from my blu-ray or DVD or LaCie players my speakers crackle at certain tones. I connect my devices via fibre-optic cables and digital cable. The tones that are most affected seem to be fairly low, sustained tones. An example is the long, orchestral music when the credits are rolling in Enemies of the State. I have tried changing from surround sound mode to the various other sound settings and the problem disappears when I switch to 2 channel stereo, 5 channel stereo, 2 channel enhanced and 5 channel enhanced. It remains on all the other audio modes. I have tried lowering the volume and this does not help. I have also tried switching off and unplugging my sub-woofer and this doesn't help. Any ideas what the problem could be?

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  • andrewr895 Aug 23, 2010

    One correction - my surround amplifier is actually a Yamaha RX-V361. For some reason FixYa picked up the wrong link.

  • andrewr895 Aug 23, 2010

    I have tried multiple formats from my DVD, Blu-Ray and LaCie player...they all have crackling when my amp is set to Dolby Digital or other surround settings.

  • andrewr895 Aug 23, 2010

    I have tried turning the subwoofer off and there is still a crackling in the front/centre/surround speakers. The crackling is not the same as distortion.

    There is an adjustment for my amp that allows me to control the frequency that it crossed over to the subwoofer - the choice is between 40hz and 200hz (its currently set at 80hz). What crossover frequency will reduce distortion in the front/surround speakers?

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Try to reduce the bass value from the equalizer (graphic) for that ..and this will cause to stop distorting ...the issue is that in the surround mode the sound is splitting in bass ; mediums ;and trebles ..and sent to the speakers by frequency category ...this may cause the bass woofer to distort cause the intensity is not balanced but only the low values being played back on it ...It can be though a issue of physical nature with it ..but usually it is just a matter of position ...(be sure where it is posted cause the bass only vibrate in a different way ) ..and of course it is a problem of graphic equalizer...so ..in short reduce the bass and mediums..at high volume ..until the vibrations disappear ...

Posted on Aug 23, 2010

  • Catalin Turcu
    Catalin Turcu Aug 23, 2010

    the front surround setting is the same with the sub-woofer ..cause in this case they are paired..the woofer with the front ..center ..the rear both ..and the front ...there are 3 lines ..with double function to the speakers..this is the cause that turning the woofer off will not fix..but reduce the frequencies ..between the 80 and 400 ..there is the area for the bass and the low mediums..

  • Catalin Turcu
    Catalin Turcu Aug 23, 2010

    or if you do not have the possibility to equalize it from the amplifier ..try from the exit signal of the playback device ...reduce the volume from the DVD ..or computer ..and increase it from the amplifier..
    Usually if the signal that you insert into an amplifier is too high level ..it will make noises and stuff..its ..reduce the input signal and increase the amp volume ..for a better control ..

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Hello,

This may not be from your speakers. This could be caused by the disc itself or from the dubbing of the movie. Try playing a different CD entirely.

Best regards

Posted on Aug 23, 2010

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