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"Airy" sound from one speaker?

W

Wally Swift

Super Member
Banned
I've noticed that whenever I turn my Sansui 2000X receiver on I get an "airy" sound from one speaker. It only comes from the left speaker. No static or buzz or anything like that. The sound is not affected when I increase or decrease the volume. It's not really an issue, just weird. Any thoughts what it might be?
 
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Not sure what you mean by "airy." Usually the word means an open sound with unblocked highs, giving a sense of space around the music. Do you mean something like that or are you saying it's a sort of 'fluf-ruffling' sound (like the wind blowing on a microphone) ?
 
I'll take a stab. It almost sounds like you are trying to describe what's known as white noise. This is due to a noisy transistor. Usually a pre driver somewhere.
 
What happens when you turn down the treble knob? I can't really imagine what an "airy" sound is if it's not hiss from a transistor or perhaps resistors.
 
is it a varying whooshing noise kind of like what you'd hear from a phone that was in the wind? i had an amp that did that. i always thought it was most likely a noisy transistor, but i replaced a lot of transistors and never did find the bad one...
 
coonmanx said:
I was thinking of a hissing sound when I read this.
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Yes, the closest thing I can relate it to is a hiss like sound. As soon as you turn the receiver on you hear it. I just thought it was supposed to be that way but I noticed today that it is only from one speaker. The volume, balance and tone controls have no affect on this sound. If I turn the balance all the way to the right you still hear it in the left channel. I tried attaching the speakers to "speakers B" instead of "A". This seemed to reduce the sound a bit. :scratch2:
 
Sometimes this effect stems from oscillation in the output stage of that channel, if so it's probably happening outside the audible spectrum but there's often audible artifacts that are within the audible range.

Any signs that one side of the amp is getting hot?

John
 
jdurbin1 said:
Sometimes this effect stems from oscillation in the output stage of that channel, if so it's probably happening outside the audible spectrum but there's often audible artifacts that are within the audible range.

Any signs that one side of the amp is getting hot?

John
Click to expand...

No. In fact this receiver stays unusually cool all the time.
 
I would think oscillation would be producing some additional heat, but maybe it's also underbiased which could offset that... if you have a way to do it, I'd be looking at the outputs with a scope and comparing one channel to the other to see what's going on.

John
 
I spoke to my local repair guy and I'm going to have him take a look at it. Now I'm obsessing over it:screwy: Man, I hooked up my old Fisher Studio Standard receiver in the meantime. Yowza, I don't recall it sounding that bad! :D Sanusi has spoiled me!
 
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