PLEASE HELP!! What causes a speaker output to sound extremely garbled/distorted? - AVS Forum
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post #1 of 15 Old 04-29-2012, 10:41 AM - Thread Starter
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It's not the speaker or wires. I have tested multiple speakers and wires. The center outputs loud volume levels so I don't think the amp is blown. Its just so muffled and distorted.

Please tell me what causes this.

Thanks
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post #2 of 15 Old 04-29-2012, 10:50 AM
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Well I can tell you creating two different threads on the matter is not going to help. When did your problem start? Does it occur with all sources? How old is the unit? Have you tried a different speaker? A different cable? Is it distorted at high or low volumes?
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post #3 of 15 Old 04-29-2012, 11:09 AM - Thread Starter
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I have tried multiple wires and speakers. I have tried using multiple inputs (optical direct surround input, etc...). I can hear what is going on it just sounds like a bad AM station that is getting very little signal. It gets loud but the sound is just too awful to listen to. I did re solder the center relay because it was loose, but that didn't correct the problem. It's about a 8-9 year old receiver. The front and rear channels work flawlessly.

Thanks for your response.
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post #4 of 15 Old 04-29-2012, 11:13 AM - Thread Starter
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Sorry, the model is a sony STR-DE875
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post #5 of 15 Old 04-29-2012, 11:37 AM
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What about just getting another avr and call it a day.
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post #6 of 15 Old 04-29-2012, 11:48 AM
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Quote:
Originally Posted by johnson636 View Post

what about just getting another avr and call it a day.

+1
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post #7 of 15 Old 04-29-2012, 12:40 PM - Thread Starter
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I have a new one for my main system. I have an extra set of speakers and want another receiver to drive them as a secondary 5.1 system. The problem: wife says NO! I found this unit at a goodwill for $20. That price is acceptable for my wife.. The unit is perfect except for its center output. Plus it works with my Sony remote with the lcd screen. I want to get it working. Buying a new one isn't an option. This is my third try at buying one from goodwill and is the nicest one so far. Plus, I feel that with a little work I should get it running. I have obtained a detailed document of the board schematics and think I have isolated which transistors are used for the center channel.

I just want to know if this is a common problem caused by a bad transistor or dry/cracked solder. If it is, I feel that the next step is to re solder all points dealing with the center channel. After that, i may have to
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post #8 of 15 Old 04-29-2012, 12:49 PM
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2 thing that will never "step foot" in my theater are a Sony receiver or cheep Klipsch speakers. Neither are very graceful at loud volumes.

God loves me, but everyone else thinks I'm an a$$hole.
My small dedicated theater.
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post #9 of 15 Old 04-29-2012, 01:00 PM - Thread Starter
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My questions did not pertain to whether I should buy a new receiver. I'm asking what might cause the garble/distortion in the center channel.

I found the Sony manufactures repair manual and have isolated which transistors are used for the center channel. It seems that my next step is to re solder all transistor points and see if that's the case. Next would be the replacing of transistors. Like I said before, I do not believe it is the amp because it gets loud. i can hear what is being said. It just sounds like a bad am channel that has a bad signal.
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post #10 of 15 Old 04-29-2012, 01:26 PM
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Quote:
Originally Posted by UNICRON-WMD View Post

2 thing that will never "step foot" in my theater are a Sony receiver or cheep Klipsch speakers. Neither are very graceful at loud volumes.

You must have the best huh? Bose LOL
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post #11 of 15 Old 04-29-2012, 02:07 PM - Thread Starter
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The distortion happens at all volume levels. Like I said before, it's like listening to an AM station that isn't coming in too well. It doesn't matter what level you have it at, it's too distorted to listen to.
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post #12 of 15 Old 04-29-2012, 02:54 PM
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Quote:
Originally Posted by carver16 View Post

You must have the best huh? Bose LOL

Actually, I figured Bose was a given on this forum.


To the original poster, I don't remember reading it happens at all volumes. You said it was awful to listen to at loud volumes.

Anyway, you receiver is 8-9 years old, it really is time for an upgrade.

God loves me, but everyone else thinks I'm an a$$hole.
My small dedicated theater.
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post #13 of 15 Old 04-29-2012, 03:44 PM
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Quote:
Originally Posted by Sony STR-DE875 View Post

My questions did not pertain to whether I should buy a new receiver.

That's true, but nevertheless, there is not a lot of component level troubleshooting conversation that goes on here. Creating different threads on the same subject is pointless.
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post #14 of 15 Old 04-30-2012, 07:47 AM
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To the OP, you are probably SOL. However, one thing you might try. Recently my sis was complaining that her Sony receiver wasn't always turning on. I took the thing apart and found that at least one of the ribbon cables that connected various boards had some corrosion on it. Just a little bit but it might have been enough to cause the problems. I cleaned it and then sprayed all the connectors with volume cleaner and disconnected and reconnected all of them. So far so good.
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post #15 of 15 Old 04-30-2012, 08:26 AM
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Quote:
Originally Posted by johnson636 View Post

What about just getting another avr and call it a day.

He'd have to change his username.
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