It’s mechanical hum from the mains transformer in the 150. Here’s a good thread to get you started…
https://community.naimaudio.com/t/a-starting-guide-to-naim-hum-buzz/13016
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It’s mechanical hum from the mains transformer in the 150. Here’s a good thread to get you started…
https://community.naimaudio.com/t/a-starting-guide-to-naim-hum-buzz/13016