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Hi.  First time here for help.  Seems my 1st gen play 5 has started making a background whistle when connected to ac power, whether playing music or not.  I've recycled power, left it unplugged for a few days, moved it to other sockets in the house but all to no avail.  I've switched it with a play 1 and the 1 works ok in the position where the 5 normally resides.  The 5 when in the position where the 1 normally lives still produces a background whistle.  Anybody have any ideas on where to go from here.  Many thanks in advance for all replies.

One possibility, as seen here (perhaps)? ..

However you are probably best to submit a system diagnostic report. Note it’s reference and then chat to Sonos Support Staff via this LINK