Originally Posted by Keungyee
Does it mean they are 1999 or newer?
I could say something a little flippant, but...

It's possible that your speakers are older than that, but the electronics (the whole back panel) have been upgraded. This is the case with my D6000s which were upgraded to 3xxxxx serial 96/24 electronics; their drive units will be a number of years older.

Roon Developer and ex-moderator of this Forum
I am #25 in the HH1 photo of fame.