hissing sound coming from behind woofer on one side AR11

I don't suppose that you are just comparing apples and oranges here, are you ? All amplifiers hiss to some degree - generally, although not always, semiconductor ones more so than tube ones. It's not unusual for one channel to be a little noisier than the other, so you might hear it more on one side than the other. If you swap a different speaker onto the hissy channel, the one that you are swapping in, might not have as good a frequency response as the one you are taking off, so you might not hear the hiss, and think that you've cured a problem that's not really there in the first place. I guess you could also have a defective tweeter or crossover in the speaker that you

If you see what I mean ...

Can you hear hiss in headphones plugged into it ? If so, is it equal between channels. Does it change depending on what input you have selected on the amp ? Have you tried swapping the speakers that are always connected to the system, between channels, rather than swapping in different speakers of possibly unknown condition and specification. One thing at a time, is the way forward with this sort of 'problem'

Arfa

I don't know if my question was ever answered. Where is the hissing comming from ? Behind speakers means behind the box.

If you can't tell from listening, use a piece of tubing to get location. You can get it down to less than an inch.

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I thought I made this point in the second posting by saying what I did to try to trace it by pushing in the woofer (you cant push in a tweeter that easily), the sound is coming from behind the woofer.

I'm thinking now that this is a windup. Looking at the the account that this has come from.

dmanzaluni ?

Yes, I think that's maybe true ...

Arfa

My reply to the original post was something like "check to see if there is a snake behind the speaker."

I will sometimes reject as a troll a posting that everyone else accepts, simply because it doesn't "ring true".

Most people do such a bad job of describing what's going on, that a perfectly legitimate (though odd) situation can come out sounding quite phony.

I'm starting to think this is a fake.

I knew it from the start. It's in my blood :)

Thank you for your confidence everyone: If I wanted to wind everyone up, dont you think I would have found a funnier way of doing it than this?

If someone can get me a way of posting a wav file to a NG, let me know and I will stick a microphone in front of the speaker and post whatever it records

Meanwhile I will take the speaker out and report back if/when I have a result

Not if you're just not too funny in the first place.

But you've already subbed the speaker and the hiss went away or so I thought I had previously read.

You'd be amazed at some of the stupid stuff you see in UseNet groups. I've never seen any of these that were actually funny.

The problem is that you are describing something that doesn't seem to make any sense, or have any obvious explanation. This quite naturally makes people suspicious.

And no one here is aware of a "mechanism" that causes speakers to produce hissing sounds on their own, especially when you say the sound is not related to the program material or its volume.

Especially if it is just a passive enclosure. Now a woofer with a built in amp is an entirely different story.

Also, the source sounds suspicious, you must admit ? I mean, dmanzaluni ? That must be "the man's a loony", mustn't it ? And the nic. Ripanykhazov. "Rippin' ya clothes off" maybe ?

Dunno. Sorry if I'm being unfair to you, but the more I look at this, the more it doesn't make any sense, and the more it begins to look like a usenet windup ...

Arfa

Of course, if it is true, we might read the following in the newspaper...

Woman killed by poisonous snake

Miss so-and-so was killed yesterday when bitten by a viper hiding behind one of her loudspeakers. The animal had curled up there for warmth, and had attracted her attention by making random hissing noises when music was played.

Rip her knickers off, Shirley ;)

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Call me an old cynic and obviously I am not a technical expert but doesnt simple logic mandate that when you sub a speaker and the sound goes away, all it means is that (what I thought blindingly obvious from the symptoms and there being no apparent logical connection between the source and the hissing, which was why I posted here: Because "The problem is that you are describing something that doesn't seem to make any sense, or have any obvious explanation" so I wondered whether anyone had come across it before) the sound wasnt coming from the source? Or did I have to add that when i put the speaker back again, the sound came back?

Call me an old cynic and obviously I am not a technical expert but doesnt simple logic mandate that when you sub a speaker and the sound goes away, all it means is that (what I thought blindingly obvious from the symptoms and there being no apparent logical connection between the source and the hissing, which was why I posted here: Because "The problem is that you are describing something that doesn't seem to make any sense, or have any obvious explanation" so I wondered whether anyone had come across it before) the sound wasnt coming from the source? Or did I have to add that when i put the speaker back again, the sound came back?

Your speakers are passive devices. They cannot make any sort of sound on their own.

If hissing is coming from one of them (but not the other, when driven from the same amp), the speaker must be therefore be the source of the hiss. But as there is nothing in the speaker that could, by itself, create sound, then the speaker must be altering or distorting its input to produce the hiss. However, you say that the presence or level of the hiss is not related to the program material.

This makes no sense. The logical conclusion is that A: you are grossly mis-describing the symptoms, or B: this is a troll.

I think it's B. I really don't have any more time for this tsuris/tsimmes. Take your pick.

check for electrical devices adjacent to the speaker, inside and outside of the wall. Your speaker coil maybe in the path of an induced magnetic field from a device near by..

etc..

ut

hen

There is a slight possibility that there is an issue with the crossover in this speaker that de-stabilizes the driving amplifier, causing an HF oscillation in the amp, yet the amp IS stable with the other speaker. I worked on an Pioneer amp that was marginally stable and would oscillate depending on the load. The clue it was oscillating was a 'sizzle' in the speaker and the overload lamp was always lit. Other than that it appeared to work fine to the owners old ears, although there was a slightly perceptable clipping distortion on louder passages. A slight adjustment of the R-C feedback in the amp returned the rock solid stability and eliminated the perceived 'hiss'. That system had been to two 'professional' shops; one said there was nothing wrong and the other said it could not be repaired.

Neil S.