Hi fi Hum
Posted: Sun Apr 15, 2018 10:29 am
This keeps popping up in threads, so I thought I'd start a specific thread.
Unwanted hum is omething I guess we've all experienced over time and some tolerate more than others.
Its probably something we've all experienced, whether it's the noise of a guitar amp on a recording, the unearthed phono input or all the other things that might cause it.
Something that's present in my system. Only noticeable when not playing music.
I think - and I put this up as a straw man - there are three causes:
Broken circuit (including earths)
Induced - ie radio frequency/magnetic fields interfering
Mains borne
Yesterday, I was in front of my system and my wife was moving things around in the room. No music playing. I notices that, when she moved to a certain position, the hum changed, she moved away and it stopped. However, I then got her to move back to the same position and there was no change. So what was that all about - a temporary change in mains; she didn't move back to exactly the same position but was somehow changing the fields around the equipment; something else that I wasn't aware of?
Unwanted hum is omething I guess we've all experienced over time and some tolerate more than others.
Its probably something we've all experienced, whether it's the noise of a guitar amp on a recording, the unearthed phono input or all the other things that might cause it.
Something that's present in my system. Only noticeable when not playing music.
I think - and I put this up as a straw man - there are three causes:
Broken circuit (including earths)
Induced - ie radio frequency/magnetic fields interfering
Mains borne
Yesterday, I was in front of my system and my wife was moving things around in the room. No music playing. I notices that, when she moved to a certain position, the hum changed, she moved away and it stopped. However, I then got her to move back to the same position and there was no change. So what was that all about - a temporary change in mains; she didn't move back to exactly the same position but was somehow changing the fields around the equipment; something else that I wasn't aware of?