Receiver has been working fine until two days ago. The audio out of the Center Speaker is very distorted. I switched speakers, but no change.
I don't have a schematic, but I will get one if the problem is not fatal.
After quite a few years of working fine my center channel became horribly distorted. I did try changing the speaker with no change. I went into the setup menu and turned the center speaker off. Anyone know whats going on?
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Re: Center Speaker Audio Very Distorted
Love your screen name.
You didn't say what, if anything, preceded the appearance of the problem. There might be a clue.
Can you describe the distortion? Is it excessively bassy? If so, is it happening on all sources?
I'm assuming this is a modern digital receiver that is capable of many soundfield simulations as well as native Dolby Digital, DTS, multi-channel. If so we can use a stereo source and through simulation redirect some of it to the center speaker.
Using one of your receiver's many multi-channel simulation modes, put in a CD or tune an FM station and use it to diagnose the problem during later steps.
If it's only a single source and that source uses individual analog channel RCA cables, swap in another one or temporarily move the Center Channel feed to one of the other channels to see if it's before the receiver (in the source).or inside the receiver.
For multiple sources:
Is your Center speaker defined properly as Large or Small in the receiver's setup menu?The size refers mostly to the bass-handling capacities of all your speakers rather than their physical size. Speakers designated as 'Small' will not be sent much in the way of bass because they can't handle it well. The LFE/subwoofer channel(s) will get all the bass that was intended for them instead.
If you have a Small speaker improperly defined as Large it may be getting bass that it can't handle and that might sound like distortion. Having a Large speaker defiend as Small would result in less bass than expected but otherwise 'clean' sound.
Check the speaker setup in the menu for excessive volume level relative to the others. There is usually a calibration procedure the receiver will use to help you adjust the subjective voume of each speaker using white noise or tones.
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Replace center channel speaker with known good one. If no longer scratchy then the voice coil of removed unit is rubbing against the magnet pole and the speaker needs to be replaced. If the replacement speaker also sounds bad, then the amp for the center channel needs repair.
Sorry for a dump question , have you changed the distorted Right speakers to LEFT to verify if speaker is OK ? First try with just STEREO ,not on Surround and please contact me for further solution possibility.. Take care..
If you have checked the speakers and wiring, the right channel has a audio driver or output problem, which explains the low volume, static, and distortion. A service technician will be required to fix the receiver so it will balance the left side.
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....
I had the exact same problem. In order to "almost" balance the center with the other channels I had to give the center +12db gain and the other channels -12db. So after I got that far with level calibration I tried some tv sound, well the center although was playing sounded like the highs were missing and a bit distorted. This is the good part, I turned the volume all the way up real fast, somewhere near max something fixed itself, the center became very loud. Now it works just like new. Hope this helps. BTW, the problem existed the same for sub channel, so when the center started working so did the sub.
yep but if your not a tech you should take this easy repair to a pro. Your problem is an open emitter resitor and happens when the units over driven or a speaker is bad for a while while it was working. if your a tech then check all of the emmitter resistors. also it could be a bad output device. Good Luck