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Thread: Annoying buzz from downlighters

  1. #1
    Join Date: May 2009

    Location: Llanerfyl, Mid Wales

    Posts: 35
    I'm Nigel.

    Default Annoying buzz from downlighters

    Does anyone know a cure for a couple of problems which are really annoying me.
    When downlighters are on in our kitchen I get a buzzing sound through my speakers.
    Also, when our cooking range fires up there is a crack through the speakers too.
    What can be done to eradicate this issue.
    Grateful for any advice.

  2. #2
    Join Date: Sep 2009

    Location: west mids, UK

    Posts: 1,269
    I'm Phil.

    Default

    modwright 36.5 DM /MSB s200 , / Marantz sa8005/onkyo sacd /bel canto 3.5, vbs , bel canto fm1
    sonos, . dct300/ /isotek sigmas /rfc xlr/chord epic cabling/Kimber select/verity audio rienzi speakers

  3. #3
    Join Date: May 2009

    Location: Llanerfyl, Mid Wales

    Posts: 35
    I'm Nigel.

    Default

    Hi Phil, it's run on oil but fires up using electricity

  4. #4
    Join Date: Jan 2009

    Location: Sheffield - UK

    Posts: 5,614
    I'm Mark.

    Default

    Get one of those Earth leakage/continuity testers and check each socket.

    100% Analogue

  5. #5
    Join Date: Oct 2016

    Location: Bolton, England

    Posts: 554
    I'm Andrew.

    Default

    The downlighters are producing a lot of RF noise which is being picked up somehow. When the cooking range switches on a spark is generated which is also a source of RF noise.
    There are two ways to tackle the problem. The first is to stop the RF from being generated in the first place by snubbing the spark/noise. The second is to block the RF at the input to the sound system, ie with an RF filter. Most amps have an RF filter at the input anyway, but it may not be strong enough. I suppose a third category of cure would be RF shielding, but RF shielding is standard practice (and an EU regulation) and your equipment should have it already.

    Unfortunately, RF problems like you describe are notoriously difficult to eliminate.

  6. #6
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 33,822
    I'm Grant.

    Default

    Buy a new cooker and lights lol
    Maybe if you had a separate mains run for the audio
    Regards,
    Grant ....
    Sometimes incompetence is useful. It helps you keep an open mind.
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  7. #7
    Join Date: Oct 2016

    Location: Bolton, England

    Posts: 554
    I'm Andrew.

    Default

    Quote Originally Posted by struth View Post
    Buy a new cooker and lights lol
    Maybe if you had a separate mains run for the audio
    New cooker and lights isn't such an insane idea. Lighting dimmers are well-known for causing problems which can be easily avoided by simply not having any lighting dimmers - prospective recording studio designers take note!

    Separate mains is not the answer. If RF is being generated and picked up by the system, having the generator powered by separate a mains supply won't make any difference. I'm sure Radio 1's transmitter isn't powered from the same ring main as your hi-fi, but that doesn't stop you from picking it up.

  8. #8
    Join Date: Mar 2017

    Location: Seaford UK

    Posts: 226
    I'm Dennis.

    Default

    I don't know what "Downlighters" are, but if this refers to dimming switches I can add the following.

    When I rebuilt my extension a few years ago I wanted to have dimmable lights above the dining table, and researched the potential for RF noise because I have a studio and Hi-Fi in the lounge.

    There are two distinct types of dimmer switch, leading edge, and trailing edge, this referring to the part of the AC waveform which is 'chopped off'.

    Leading are noisy, and trailing are not, but are more expensive, and I used the latter and have had no problems.

    Other than that a particular noise emission is as stated above dealt with by supressing its emission from source, (Radiospares make encapsulated CR networks for this purpose), ie spark suppression, and then also maximum screening to prevent RF emission.

    The screening principle also applies to the 'receiving' equipment.

  9. #9
    Join Date: Sep 2009

    Location: west mids, UK

    Posts: 1,269
    I'm Phil.

    Default

    I recently spent many months agonising over my amp which was making static like noises , only when using rca output . we are pretty sure that mains noise was causing this as once I caught it doing it with the washing machine being turned on

    the valve amp repairer found everything to be absolutely brilliant and working but that noise was getting in via the rca output. so he made me a little cable to attach to the other rca output and ground to the chassis and its been sounding fabulous ever since .

    hope yours is rectified soon as it drove me BONKERS
    modwright 36.5 DM /MSB s200 , / Marantz sa8005/onkyo sacd /bel canto 3.5, vbs , bel canto fm1
    sonos, . dct300/ /isotek sigmas /rfc xlr/chord epic cabling/Kimber select/verity audio rienzi speakers

  10. #10
    Join Date: May 2009

    Location: Llanerfyl, Mid Wales

    Posts: 35
    I'm Nigel.

    Default

    Not just driving me bonkers!
    The rest of the family having to do stuff in the dark in the kitchen is driving them mad too!

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