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Harman Kardon 495i

Discussion in 'Audio' started by bobbysl, Aug 9, 2018.

  1. bobbysl

    bobbysl

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    Aug 9, 2018
    My receiver seems to be putting out less bass in the left channel. I've done enough experimenting with the speakers etc to determine the issue is the receiver. I am running it into a pair of Infinity RS5000's. I get lots of woofer bounce in one channel and minimal in the other, and when panning I can clearly here the less bass in one channel.
     
  2. kellys_eye

    kellys_eye

    4,289
    1,143
    Jun 25, 2010
    Component tolerances in the tonal control circuit? Tolerances in the amplifier bypass components? Problems in the passive speaker filter components?

    You really need to apply a known signal and monitor the output using the correct test equipment to 'prove' a fault or the best you will end up doing is changing the relevant parts on an ad hoc basis until you get the sound that pleases you.
     
  3. bobbysl

    bobbysl

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    Aug 9, 2018
    I have had this system since new in the late 80's. It was put away last 10 years and I am now cleaning it up and getting it put back together. The less bass in one channel is a new thing.
     
  4. kellys_eye

    kellys_eye

    4,289
    1,143
    Jun 25, 2010
    It's a known problem that (some) capacitors age badly - change value, change internal resistance - so finding such issues isn't unusual. Many restoration techniques involve 're-capping' equipment to guarantee both safety and operational specification but that can be overkill if the issue is simply 'one' component out of tolerance.

    As I stated, you would need specialist test equipment to locate such an issue to specific component(s). One other method may be to add (or subtract) capacitance in the tone control circuitry until you get a matching response across both channels. Not ideal but far easier than a full re-cap procedure.
     
  5. Audioguru

    Audioguru

    2,346
    517
    Sep 24, 2016
    If the "woofer bounce" is on the channel that has less bass then it is probably a faulty series output capacitor that feeds the speaker. I assume "woofer bounce" is poor damping of the resonance.
     
  6. WHONOES

    WHONOES

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    May 20, 2017
    Have to agree with Audioguru. Sounds like the output capacitor has dried out during storage. Simply replacing it may cure your problem. If you can, replace it with a bipolar electrolytic of the same value and voltage.
    This advice assumes of course that the amplifier does not have a split rail power supply.
     
  7. bobbysl

    bobbysl

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    Aug 9, 2018
    woofer bounce is in the one with more bass. The receiver is an HK495i from late 80's
     
  8. bobbysl

    bobbysl

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    0
    Aug 9, 2018
    Honestly the woofer bounce doesn't concern me too much, it's the other channel with less bass that does
     
  9. WHONOES

    WHONOES

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    May 20, 2017
    My remarks in post #6 apply to the poor bass. When a capacitor dries out, it's effective value reduces which would cause the problem you are experiencing.
     
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