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Naim Transformer Hum or Buzz, how loud should it be?

Discussion in 'audio' started by Napzca, Jul 21, 2020.

?

Does Your Naim Buzz

  1. Yes

    65.0%
  2. No

    35.0%
  1. Napzca

    Napzca Active Member

    I am wondering how loud a Naim transformer Hum or Buzz should be, what is the Naim tolerance for Hum in dB?

    I recorded 76dB Hum or Buzz at 200Hz on a Naim Nap 250.

    What is your equipment and Hum level in dB and Hertz?
     
    NL likes this.
  2. stevec67

    stevec67 pfm Member

    Mine is silent. I use a different manufacturer.
     
  3. NL

    NL pfm Member

  4. Woodface

    Woodface pfm Member

    I can hear power supplies when up close. Nap 250s are very noisy or can be. Could need a re-cap.

    It probably bothers me more now than it did, not sure why.

    This will quickly turn into an anti naim thread
     
    Spike55 likes this.
  5. MJS

    MJS Technical Tinkerer

    Hum from the cases is entirely down to the toroidal transformer they use. The older CB gear used to use Holden and Fisher transformers and these were almost silent. Since then they've gone with Nuvotem and they're noisier mechanically. There's nothing to add. If they used a different case design and could have taller rather than flatter transformers they could alleviate this somewhat.
     
  6. Gervais Cote

    Gervais Cote Predator

    Or use two smaller transformers away from each other instead of only one big transfo.
     
  7. Bob McC

    Bob McC Living the life of Riley

    My 250 hums very quietly on occasion.
    I have never been bothered enough to measure it!
     
  8. stevec67

    stevec67 pfm Member

    More costly.
     
    Bill Colledge likes this.
  9. JonR

    JonR Brainwashed Bloke

    I used to have a big Naim system: CDS3/XPS2, 252/SCap, 300/300PSU. The transformers in the 300 PSU unit and the Supercap used to buzz constantly. Not a problem when I lived alone (and it didn't affect the sound) but I live in a very small terraced house and don't play the hifi every minute of every day so not an ideal situation to put up with long term. I downsized many moons ago so all of the aforementioned boxes have gone, but I understand from Naim users on the forum these days that the 'DR' versions of the XPS and 300PSU exhibit no transformer hum at all. OTOH I've also read (on here, I think) that using some kind of balanced power supply unit might help to alleviate the problem.
     
  10. wd40addict

    wd40addict pfm Member

    My NAP160 has H&F transformer and doesn't hum. Having read a lot about this I made sure that when I got a Hicap for my NAC72 it was old enough to also have H&F - silence. Can't believe H&Fs 'secrets' died with them, surely Naim could have employed one of their former employees for a bit of consultancy?
     
    Gervais Cote likes this.
  11. dweezil

    dweezil pfm Member

    That's only 9dB quieter than the average rock concert do you bother with music as well?
     
  12. tiggers

    tiggers pfm Member

    That's because it's from China and broken!
     
  13. wow&flutter

    wow&flutter pfm Member

    I had a Nac72 that was completely silent!
     
    jimbot2.0 likes this.
  14. graystoke4

    graystoke4 pfm Member

    My power amps throw out over 300 watts and weigh over 30kg each, when on they are silent with your ear pressed against the case, and no hiss through the speakers, if your amps/transformers humm, its because v- poor quality, and v-poor implementation, but don't worry naim fan-boys will buy anything, and naim know it,
     
    Tom60300 and DavidParis like this.
  15. Brian

    Brian Eating fat, staying slim

    Good for you, but ...

    Does Your Naim Buzz
     
  16. Brian

    Brian Eating fat, staying slim

    Mine buzzes but I can’t hear it when music is playing even if I try, so it’s not really a concern.

    I don’t have the means of testing the dB and Hz.
     
  17. Napzca

    Napzca Active Member

    Haha that is from 1 inch away from the top of the case.
     
  18. Napzca

    Napzca Active Member

    To analyse the Hum you could use a dB meter or Spectrum Analyser for the Phone or Tablet or you could use REW.
     
  19. Darth Vader

    Darth Vader From the Dark Side

    Its surprising that such an expensive piece of kit has this problem. My amps each have two large and heavy 1.2KVA xformers that are getting on for around 18 years old. They are silent even with my ear against the case. Also there is no vibration that I can feel. I have two of these beasts so thats four 1.2KVA xformers and no noise.

    Having said that I suppose I am lucky in not having DC on the mains. My Naim kit did pick up French radio stations though but my latest kit is silent. The only hum I do get is from my phono stage when its in use but that is entirely my fault for placing it directly above those four large xformers!

    Cheers,

    DV
     
  20. MikeMA

    MikeMA pfm Member

    Are we to infer that Naim kit emits audible hums and buzzes? People put up with this? Blimey, I had no idea.
     
    Tom60300, DavidParis and Barrymagrec like this.

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