Question about Harman Kardon AVR 635 Receiver

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Center Speaker sound just not right

I just purchased an HK AVR 645. The voice coming from my center speaker just doesn't sound crisp when watching TV shows, especially Lost. I am using a monster optical cable going from my cable box to my receiver. have tried tweaking every area I can think of to try and fix this problem. Does anyone have any suggestions on what i can do for this problem? The speakers are high end Focal's that i just recently purchased so I do not think it is the speaker. Any help would be great. Thanks

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If the optical cable was bad, the sound would be distorted period. The optical cable (whether coax or fiber) just simply carries the coded audio to the receiver which in turn decodes it. I have never heard of a signal just screwing up the center channel, and I've been at this better than 30 years. Not to say it's impossible, but very unlikely.

Did you try swapping speakers? Move the left one to the center and the center to the left. Does the center remain "distorted"? Does the left become "distorted"? If the center remains distorted, the receiver's center channel has something wrong with it. If the left is distorted, the speaker has a problem.

For the future. it is un-neceaasy to purchase expensive cables. In fact it could make things worse. The claim to fame of most expensive cable manufacturers is the gold plating on the connectors. Unless the bioth sides have gold plating (receiver, cable box) this actually creates a capacitive reactance between the different metal types. FYI-capacitive and inductive capacitances are the basis for designeing cross-overs, filters, etc. So basically, an undesired filtering effect is created. This applies to speaker cables, audio, video, etc....

Jeff

Posted on Feb 17, 2008

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You seem have a problem with a component in that channel, the bad news is that it is hard to fix that type of problem (you would be better off if the channel died). All of the components in the final output section are part of the same audio loop (per channel), which makes it hard to find the faulty part.

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1. During this event, what is the source of your INPUT audio signal?
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