I am familiar with naim amps making small switch on pop through the speakers, however i have it on left speaker only and twice as loud as previous Naim amps owned..
Also get a pop when mute/unmute which never had with previous Naim amplification..
Switching sources whether with facia buttons or remote also causes same pop through left speaker.
I had a popping when changing channels on a naim amp. Contacted naim and amp was sent in for attention as I was told this was not right. Turned out to be the tantalum caps needed renewing. Silent switching when returned to me.