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Help - Sony STR-DE925 Reciever sub output malfunctioning

by Firehawk390 / August 19, 2006 2:26 AM PDT

I've been using the reciever's line level sub output for my sub for about 8 years now. Just recently, the sub started to have a constant vibration/hum. What's strange is that it seems to be independent of the source signal going into the reciever, meaning, it will still hum even while I'm switching sources. What's even more strange is that if I tap on the top of the reciever with my finger, the sub's cone will thump along with it. It's almost as if the line level is putting out the reciever's natural frequency or somthing. The hum/vibration can get pretty loud/violent at times.
Does anyone think they know what could be the problem? Everything else with the reciever works fine and I'd like to salvage it if possible. Thanks.

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TRY THIS
by stewart norrie / August 19, 2006 3:54 AM PDT

Pull the audio cable from the sub does it still hum? if the hum goes away then you may have a loose or bad cable. If the sound is there with no audio input then you have problems with the amp in the subwoffer good luck and please posr back to us stewee

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Response
by Firehawk390 / August 19, 2006 5:58 AM PDT
In reply to: TRY THIS

Stewee,
The hum(rumble is actually a better word to describe it) exists only when the line level cable is connected to the sub. I tried a different cable, but no effect. I hooked the sub up to my reciever using the high level inputs (basically having it act like a regular speaker) and the rumble is not there.
I'm just wondering if something internal with the reciever's line level out circuitry could be the problem.

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Follow Up
by Firehawk390 / August 23, 2006 9:36 AM PDT

Has anyone had this happen to them or heard of this problem?

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Sub Hum
by RoadRunner6 / August 24, 2006 7:04 PM PDT
In reply to: Follow Up
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Sounds like..........
by kena10 / August 25, 2006 12:05 AM PDT

The sub output on the receiver is suffering from cold solder. Go buy another sub and test it, if the problem still persists then you know it's the receiver and not the sub. If the problem goes away, then you know it's the sub. At that point you can still take the new sub back and return it.

Jimmy

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It's the reciever.....
by Firehawk390 / August 26, 2006 7:16 AM PDT
In reply to: Sounds like..........

Well, I bought a new sub and hooked it up to the reciever and got the same constant rumbling.
If it is the cold soldering issue that you spoke of, is it something that I could fix at home? I've done some soldering before.
Thanks.

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Well.....
by kena10 / August 27, 2006 12:27 AM PDT
In reply to: It's the reciever.....

Try this first...

get a can of compressed air and run this test without unplugging any sources or speakers or even the sub.

Turn off & unplug the receiver and open the case.

Locate the sub output jack and spray some compressed air to clean up the area.

With the case open, plug the receiver again and turn it on.

If the noise went away, then the problem could be dust related.

If the noise is still there, I would encourage you to take it to best buy and get it serviced.

fixing a cold solder issue on a board of that calibre isn't easy because most of the soldering is done by a machine and is extremely precise.

Although I don't think it is impossible to apply more solder to the jack, the problem could also be in the board itself.

The nice thing about taking it to a service center is that if you don't want to pay for the repair, you don't have to and you can just come and pick the equipment. I think they'll charge you a minimum amount to look it over, so it won't be a big expense.

I hope this helps

Jimmy

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