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A really interesting amplifier/loudspeaker/EMI (or RFI) problem Someplace Else
With some trepidation 
I got sucked into a really interesting troubleshooting discussion at (don't judge me!) ASR last night.
There is a fellow who posted over there about some induced noise (a buzzy hum -- like a ground loop hum) that his center channel loudspeaker (a B&W speaker) is picking up from his big (and, I think, new or fairly new) McIntosh MC255 5-channel A/V power amp.
Cutting to the chase: The amp induces this sound in the (passive) center channel speaker even if the speaker is not connected to anything. The speaker is receiving, detecting, and transducing the induced hum. That seems... odd. Nigh-on Twilight Zone odd.
Now -- his amp and speaker are in very cramped quarters, but the question is: what exactly the heck is going on here? More to the point, is the EMI from the amp normal or is there something funny going on with the amp?
If (?!) any of you is suitably curious -- here's a link to the thread.
https://www.audiosciencereview.com/forum/index.php?threads/mcintosh-transformer-causing-noise-in-speakers-while-disconnected.53114/
I was shootin' from the hip and not much help, in full disclosure.
It's a fascinating observation, though.
Y'all got any thoughts?
I got sucked into a really interesting troubleshooting discussion at (don't judge me!) ASR last night.
There is a fellow who posted over there about some induced noise (a buzzy hum -- like a ground loop hum) that his center channel loudspeaker (a B&W speaker) is picking up from his big (and, I think, new or fairly new) McIntosh MC255 5-channel A/V power amp.
Cutting to the chase: The amp induces this sound in the (passive) center channel speaker even if the speaker is not connected to anything. The speaker is receiving, detecting, and transducing the induced hum. That seems... odd. Nigh-on Twilight Zone odd.
Now -- his amp and speaker are in very cramped quarters, but the question is: what exactly the heck is going on here? More to the point, is the EMI from the amp normal or is there something funny going on with the amp?
If (?!) any of you is suitably curious -- here's a link to the thread.
https://www.audiosciencereview.com/forum/index.php?threads/mcintosh-transformer-causing-noise-in-speakers-while-disconnected.53114/
I was shootin' from the hip and not much help, in full disclosure.
It's a fascinating observation, though.
Y'all got any thoughts?
mhardy6647
1 ·
Re: What do we have here?
Built to compete with Cerwin-Vega.
Bro they've been posted and talked about here many many times.
Reading is fundamental....
Bro they've been posted and talked about here many many times.
Reading is fundamental....
pitdogg2
4 ·
Re: You’re doing it wrong…
A square meteor maybe? Falling construction beam? Irate spouse with a disc cutter?
SeleniumFalcon
2 ·
Re: Post a picture... any picture
Meanwhile in the hood, a tree snags another victim on dry roads....
SCompRacer
4 ·
Re: A really interesting amplifier/loudspeaker/EMI (or RFI) problem Someplace Else
My guess would be the large toroidal xns-frmr in the amp that it's placement within said component is only a couple of inches away from the magnets of the center speaker...and in this case, it's audible. Tom
I read some of the comments at ASR. The guy is getting the noise in the L & R speakers as well, which are far away from the amp, so it is not a matter of being within a few inches of the center.
F1nut
1 ·
Re: Post a picture... any picture
Well Willow here's some interesting turkey facts:
"The turkey is an unusual bird in that it can reproduce asexually. Parthenogenesis is a phenomenon that can occur in other types of animals, such as sharks, but female turkeys, on the other hand, can and frequently do produce living offspring without fathers.
On rare occasions, hens can lay a fertilized egg without the presence of a tom. Predicting parthenogenesis is still difficult, but research indicates that it can occur when a mate is unavailable "
Back when I was in the Navy there were several instances where after our ship came back after a 10 month deployment that a shipmate would find that his wife would be several months pregnant.
I guess parthenogenesis occurs in human females too. 🤔🚼
"The turkey is an unusual bird in that it can reproduce asexually. Parthenogenesis is a phenomenon that can occur in other types of animals, such as sharks, but female turkeys, on the other hand, can and frequently do produce living offspring without fathers.
On rare occasions, hens can lay a fertilized egg without the presence of a tom. Predicting parthenogenesis is still difficult, but research indicates that it can occur when a mate is unavailable "
Back when I was in the Navy there were several instances where after our ship came back after a 10 month deployment that a shipmate would find that his wife would be several months pregnant.
I guess parthenogenesis occurs in human females too. 🤔🚼
mrbigbluelight
4 ·
Re: Post a picture... any picture
How do we know that the truck wasn't peacefully parked alongside the road when it was viciously attacked by a rogue tree ? 🤔
I think that we're all jumping to premature conclusions before the proper authorities have had the opportunity to tell us what to think 🤔
I think that we're all jumping to premature conclusions before the proper authorities have had the opportunity to tell us what to think 🤔
mrbigbluelight
8 ·
Re: Post a picture... any picture
nooshinjohn wrote: »
I mean, it could become a meme.
We could put Bernie & his mittens in the back -- or Capt. Picard and Riker... or them two women and the white cat...
mhardy6647
6 ·
Re: Post a picture... any picture
west coast flat-ironed scoop thing, where the kids sometimes tuck their ears in, too.
Yea, what is up with that?
Brian Deegan did that way back when, seems to have caught on.
pitdogg2
1 ·