HiFi Subjectivist ¦ Audio Forum ¦ NVA User Group

My BMU has been in place for about a month, and has consistently been making a fairly loud buzzing. At decent listening volumes it is a lower level than the hum through the speakers that it has eliminated, but it is quite obstructive at lower volume levels and when not playing music.

I have been planning to find a wooden box that I could put it in and dampen the inside, but then today the hum stopped. It has been completely silent all day.

Is there any way that it could have bed in or changed in some way, or has some big nasty been removed from the local mains supply?

No it is the quality of your mains changing, get one of these if it bothers you.

https://www.atlhifi.com/shop/fully-asse ... d-in-case/

Interesting. I’ll wait and see how it behaves for a while. If it stays quiet then I won’t need anything. If it gets noisy again, then maybe I’ll get that filter.

Do you think it would have an effect on the music, or does the BMU render that null and void?

Arguable. I have convinced myself it interferes a little, but a very little that could just be my mood. BUT bad transformer buzzing is a lot worse.

Dr Bunsen Honeydew wrote: ↑Tue Jan 15, 2019 6:59 pm No it is the quality of your mains changing, get one of these if it bothers you.

https://www.atlhifi.com/shop/fully-asse ... d-in-case/

I bought one of these following the Doc's recommendation and it has been silent ever since. Previously it used to hum at times, especially first thing in the morning.

I also purchased one and it has reduced the “noise on my mains”. I would certainly recommend the blocker. Delivery from Bulgaria was about a week.

and if you have more DC than that simple two cap unit can deal with try one of these, he does bare pcbs as well

https://sjostromaudio.net/cart/en/mains ... -unit.html

After 3 days of silence the loud buzz has come back and it seems like it’s here to stay. Think I’ll be trying that filter after all.

The supply companies should get it made illegal to pollute your mains electricity, as it is illegal to pollute your mains water. This is the equiv of intermittent brown stained water coming out the tap.

A neighbour of yours is screwing your pleasure.

Dr Bunsen Honeydew wrote: ↑Sat Jan 19, 2019 9:47 pm A neighbour of yours is screwing your pleasure.

Rather embarrassingly, it turns out I’ve been screwing myself. I tracked down the problem to a humidifier that I hade constantly running on low setting. Great big hum on low setting, lesser hum on high setting. Inky black silence when it’s turned off.

Time to start living with dry air...