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  1. Hi Greg,

    I have not got an APX4 but used to have one. From memory it did hum sometimes. My Avondale A260 occasionally hums though especially when the wifes hairdrier is going. I found that switchmode power supplies like on the SB3 sets if off as well.

    The Avondale Linear PS I have on the Caiman is silent though.

    The hum is the transformer picking up the mains "dirt" and will not affect the sound quality. Can be anoying if your listening chair is near to it though.

    The Naim kit I used to have hummed quite loudly and this was standard.

    Regards

    Chris
  2. View Conversation
    Chris. I've got an Avondale APX4. I don't know if it's just me, but I'm convinced that it 'hums' far louder than it used to. It's not like a fridge or fluorescent light, but it does make a noticable hum. Note that the noise is not through my speakers - it's purely from the APX4 unit itself. I've got it next to a Krell KAV250 power amp which makes no noise whatsoever - though as I say, it could be me going mad. Does yours make any noise? Anything at all? Regards. Greg
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